Journal ArticleComputer Methods in Applied Mechanics and Engineering · May 15, 2025
Manipulating the dispersive characteristics of vibrational waves is beneficial for many applications, e.g., high-precision instruments. architected hierarchical phononic materials have sparked promise tunability of elastodynamic waves and vibrations over m ...
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Journal ArticleMacromolecules · January 28, 2025
Understanding the mechanical properties of polymer nanocomposite materials is essential for industrial use. Particularly, the determination of the polymer modulus at the nanofiller-polymer interphase is important for optimizing the interfacial mechanical p ...
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Journal ArticleComputers and Structures · December 1, 2024
Acoustic metamaterials are a subject of increasing study and utility. Through designed combinations of geometries with material properties, acoustic metamaterials can be built to arbitrarily manipulate acoustic waves for various applications. Despite the t ...
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Journal ArticleSoft matter · October 2024
Modern materials design strategies take advantage of the increasing amount of materials property data available and increasingly complex algorithms to take advantage of those data. However, viscoelastic materials resist this trend towards increased data ra ...
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Journal ArticleIntegrating Materials and Manufacturing Innovation · September 1, 2024
There is an urgent need for ready access to published data for advances in materials design, and natural language processing (NLP) techniques offer a promising solution for extracting relevant information from scientific publications. In this paper, we pre ...
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Journal ArticleIntegrating Materials and Manufacturing Innovation · September 1, 2024
Advances in materials science require leveraging past findings and data from the vast published literature. While some materials data repositories are being built, they typically rely on newly created data in narrow domains because extracting detailed data ...
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Journal ArticleScience advances · May 2024
Holistic and intentional training prepares next-generation materials informatics leaders and workforce for expedited materials discovery and design. ...
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Journal ArticleDigital discovery · October 2023
Large-language models (LLMs) such as GPT-4 caught the interest of many scientists. Recent studies suggested that these models could be useful in chemistry and materials science. To explore these possibilities, we organized a hackathon. This article chronic ...
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Journal ArticleMaterials and Design · August 1, 2023
Advancements in additive manufacturing (AM) technology and three-dimensional (3D) modeling software have enabled the fabrication of parts with combinations of properties that were impossible to achieve with traditional manufacturing techniques. Porous desi ...
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Journal ArticleData in brief · August 2023
Additive manufacturing has provided the ability to manufacture complex structures using a wide variety of materials and geometries. Structures such as triply periodic minimal surface (TPMS) lattices have been incorporated into products across many fields d ...
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Journal ArticleNature communications · August 2023
Polymers are ubiquitous to almost every aspect of modern society and their use in medical products is similarly pervasive. Despite this, the diversity in commercial polymers used in medicine is stunningly low. Considerable time and resources have been exte ...
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Journal ArticleNanomaterials (Basel, Switzerland) · August 2023
Polymer nanodielectrics present a particularly challenging materials design problem for capacitive energy storage applications like polymer film capacitors. High permittivity and breakdown strength are needed to achieve high energy density and loss must be ...
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Journal ArticleMacromolecules · June 2023
The NanoMine database, one of two nodes in the MaterialsMine database, is a new materials data resource that collects annotated data on polymer nanocomposites (PNCs). This work showcases the potential of NanoMine and other materials data resources to assis ...
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Journal ArticleTire Science and Technology · April 1, 2023
Tread compounding has always been faced with the simultaneous optimization of multiple performance properties, most of which have tradeoffs between the properties. The search for overcoming these conflicting tradeoffs have led many companies in the tire in ...
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Journal ArticleNature materials · January 2023
Next-generation structural materials are expected to be lightweight, high-strength and tough composites with embedded functionalities to sense, adapt, self-repair, morph and restore. This Review highlights recent developments and concepts in bioinspired na ...
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Journal ArticleExtreme Mechanics Letters · November 1, 2022
Machine learning models can assist with metamaterials design by approximating computationally expensive simulators or solving inverse design problems. However, past work has usually relied on black box deep neural networks, whose reasoning processes are op ...
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Journal ArticleScientific data · May 2022
Graph databases capture richly linked domain knowledge by integrating heterogeneous data and metadata into a unified representation. Here, we present the use of bespoke, interactive data graphics (bar charts, scatter plots, etc.) for visual exploration of ...
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Journal ArticleAdditive Manufacturing · March 1, 2022
Poly(ether ether ketone) (PEEK) is a high-performance, semicrystalline thermoplastic that has attracted significant interest for material extrusion additive manufacturing techniques such as fused filament fabrication (FFF) but remains beset by poor weld st ...
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Journal ArticleMRS bulletin · January 2022
AbstractFor over three decades, the materials tetrahedron has captured the essence of materials science and engineering with its interdependent elements of processing, structure, properties, and performance. As modern computational and statistical ...
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ConferenceECS Transactions · January 1, 2022
Predicting and designing the properties of polymer nanodielectrics is challenging due to the number of parameters controlling properties and the breadth of scale (from electronic to mm). This paper summarizes a preliminary study using elongated semiconduct ...
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Journal ArticleScience advances · December 2021
Personal thermal management textile/wearable is an effective strategy to expand the indoor temperature setpoint range to reduce a building’s energy consumption. Usually, textiles/wearables that were engineered for controlling conduction, convection, radiat ...
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Journal ArticleProgress in Polymer Science · August 1, 2021
The past two decades have seen atomic force microscopy (AFM) evolve from an experimental technique to probe simple surface topography to one that can spatially map nanoscale material properties with exquisite sensitivity and high resolution. An expanding a ...
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Journal ArticleAdditive Manufacturing · May 1, 2021
Fused filament fabrication (FFF) is a common additive manufacturing method for polymers that has been widely adopted due to its low cost and ease of use. However, FFF remains limited in high performance applications due to the weak mechanical properties of ...
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Journal ArticlePolymer · April 14, 2021
The role of nanoscale heterogeneity on the mode I fracture toughness, KIc, of model epoxy networks has been investigated. Model systems utilized consist of diglycidyl ether of bisphenol A (DGEBA) as the epoxide with a stoichiometric amine mixture of a rigi ...
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Journal ArticleJournal of cheminformatics · March 2021
The inconsistency of polymer indexing caused by the lack of uniformity in expression of polymer names is a major challenge for widespread use of polymer related data resources and limits broad application of materials informatics for innovation in broad cl ...
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Journal ArticleSoft robotics · February 2021
Many mammals use their vibrissae (whiskers) to tactually explore their surrounding environment. Vibrissae are thin tapered structures that transmit mechanical signals to a wealth of mechanical receptors (sensors) located in a follicle at each vibrissal bas ...
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Chapter · January 1, 2021
Modern tire compound design is confronted with the simultaneous optimization of multiple performance properties, most of which have tradeoffs between the properties. In order to uncover new design principles to overcome these historical tradeoffs, multisca ...
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Journal ArticleRapid Prototyping Journal · January 1, 2021
Purpose: The purpose of this study is to understand how printing parameters and subsequent annealing impacts porosity and crystallinity of 3D printed polylactic acid (PLA) and how these structural characteristics impact the printed material’s tensile stren ...
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Journal ArticleMolecular Systems Design and Engineering · October 1, 2020
With an unprecedented combination of mechanical and electrical properties, polymer nanocomposites have the potential to be widely used across multiple industries. Tailoring nanocomposites to meet application specific requirements remains a challenging task ...
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Journal ArticleNanocomposites · August 27, 2020
Achieving controlled nanoparticle dispersion through melt processing has been challenging as processing-structure rules for polymer nanocomposites are still not well-defined. This work focuses on developing a quantitative understanding of the filler–matrix ...
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Journal ArticleJournal of Physics D: Applied Physics · August 12, 2020
Polymer nanodielectrics are an emerging class of materials with intriguing combinations of properties. They have application in everything from energy storage to high voltage electrical transmission, and energy generation. This article focuses on insulatin ...
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Journal ArticleActa Materialia · August 1, 2020
The low symmetry martensite phase in Nickel-Titanium (NiTi) shape memory alloy (SMA) has a hierarchical microstructure with micro-scale crystallites, which themselves consist of nano-laminates with an internal twin structure. The martensite phase deforms i ...
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Journal ArticleAdvanced Theory and Simulations · August 1, 2020
An analysis is presented of the error propagation through a simplified contact model for atomic force microscopy (AFM) static force spectroscopy, one that is meant to be intuitive and pedagogically informative rather than maximally realistic. It is shown t ...
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Journal ArticleACS macro letters · August 2020
With the advent of the materials genome initiative (MGI) in the United States and a similar focus on materials data around the world, a number of materials data resources and associated vocabularies, tools, and repositories have been developed. While the m ...
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Journal ArticleMolecular Systems Design and Engineering · June 1, 2020
Data-driven methods have attracted increasingly more attention in materials research since the advent of the material genome initiative. The combination of materials science with computer science, statistics, and data-driven methods aims to expediate mater ...
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Journal ArticleMaterials Science and Engineering: A · January 13, 2020
Deformation characterization of low-symmetry phases such as martensite in SMAs is challenging due to a fine-scale hierarchical microstructure. Using X-ray microLaue diffraction, in-situ deformation of martensite is examined in a notched NiTi specimen. The ...
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Chapter · January 1, 2020
Knowledge graphs can be used to help scientists integrate and explore their data in novel ways. NanoMine, built with the Whyis knowledge graph framework, integrates diverse data from over 1,700 polymer nanocomposite experiments. Polymer nanocomposites (pol ...
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Journal ArticleMaterials Letters · December 15, 2019
The interaction between structure and microstructure is studied via compression of NiTi Shape Memory Alloy (SMA) micropillars. In particular, the suppression of phase transformation seen in experiments when the intrinsic grain size approaches the external ...
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Journal ArticleMacromolecules · November 26, 2019
Atomic force microscopy (AFM) is a powerful technique for imaging polymer nanocomposites as well as other systems with heterogeneous material properties on the nanoscale. However, the quantitative measurement of modulus is highly susceptible to convoluting ...
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Journal ArticleMaterialia · June 1, 2019
Numerical modeling of viscoelastic properties is critical to developing the structure-property relationship of polymer nanocomposites. While it is recognized that the altered polymer region near filler particles, the interphase, significantly contributes t ...
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Journal ArticleSoft matter · January 2019
The stiffening of polymers near inorganic fillers plays an important role in strengthening polymer nanocomposites, and recent advances in metrology have allowed us to sample such effects using local mechanical measurement techniques such as nanoindentation ...
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ConferenceProceedings of the ASME Design Engineering Technical Conference · January 1, 2019
Materials design can be cast as an optimization problem with the goal of achieving desired properties, by varying material composition, microstructure morphology, and processing conditions. Existence of both qualitative and quantitative material design var ...
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Journal ArticleJournal of Polymer Science, Part B: Polymer Physics · December 1, 2018
To relate the mechanical responses of hard–soft copolymer systems with their microstructures, a coarse-grained molecular dynamics approach is employed, and mechanical properties of both hard and soft domains are calculated. We first investigate the enhance ...
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Journal ArticleMacromolecules · November 13, 2018
An atomic force microscope (AFM) based fast dynamic scanning indentation (DSI) nano-DMA method, which relies only on the commonly available capabilities of commercial AFMs to provide quantitatively accurate high-resolution (∼15 nm) spatial maps of local vi ...
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Journal ArticleJournal of Mechanical Design · November 1, 2018
Identifying the key microstructure representations is crucial for computational materials design (CMD). However, existing microstructure characterization and reconstruction (MCR) techniques have limitations to be applied for microstructural materials desig ...
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Journal ArticleAPL Materials · November 1, 2018
Polymer nanocomposites consist of a polymer matrix and fillers with at least one dimension below 100 nanometers (nm) [L. Schadler et al., Jom 59(3), 53-60 (2007)]. A key challenge in constructing an effective data resource for polymer nanocomposites is bui ...
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Journal ArticleMacromolecules · October 23, 2018
In polymer nanocomposites (PNCs), the physical and chemical interactions at the polymer matrix-filler interface lead to local variations in polymer properties over a substantial "interphase" region in the vicinity of the interface. Characterization of mech ...
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Journal ArticleScientific reports · September 2018
Stochastic microstructure reconstruction has become an indispensable part of computational materials science, but ongoing developments are specific to particular material systems. In this paper, we address this generality problem by presenting a transfer l ...
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Journal ArticleComposites Science and Technology · July 7, 2018
To predict the properties of nanocomposites, computational models have demonstrated that the interphase behavior can be expressed using the matrix properties with a modified (shifted) frequency. The amount of the shift necessary for a given sample data set ...
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Journal ArticleShape Memory and Superelasticity · June 1, 2018
Porous NiTi shape memory alloys have applications in the biomedical and aerospace fields. Recent developments in metal additive manufacturing have made fabrication of near-net-shape porous products with complicated geometries feasible. There have also been ...
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Journal ArticlePloS one · January 2018
The cost of specialized scientific equipment can be high and with limited funding resources, researchers and students are often unable to access or purchase the ideal equipment for their projects. In the fields of materials science and mechanical engineeri ...
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ConferenceProceedings of the ASME Design Engineering Technical Conference · January 1, 2018
In Computational Materials Design (CMD), it is well recognized that identifying key microstructure characteristics is crucial for determining material design variables. However, existing microstructure characterization and reconstruction (MCR) techniques h ...
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Journal ArticleJournal of Applied Physics · August 14, 2017
It has been found that doping dielectric polymers with a small amount of nanofiller or molecular additive can stabilize the material under a high field and lead to increased breakdown strength and lifetime. Choosing appropriate fillers is critical to optim ...
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Journal ArticleMacromolecules · July 25, 2017
The issue of how significantly and over what length scales stiffness or modulus can be modified by the presence of a substrate or nanoparticle interface is important in the design and performance of polymer nanocomposites and nanostructured polymers. Here, ...
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Journal ArticleAPL Materials · May 1, 2016
Polymer nanocomposites are a designer class of materials where nanoscale particles, functional chemistry, and polymer resin combine to provide materials with unprecedented combinations of physical properties. In this paper, we introduce NanoMine, a data-dr ...
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Chapter · July 1, 2015
In this unique book, Elastomeric Polymers with High Rate Sensitivity, Dr. Roshdy Barsoum and expert contributors bring together the cutting-edge testing methodologies, material properties, and critical design data for engineers seeking to ... ...
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Journal ArticleActa biomaterialia · February 2015
For centuries, physicians have relied on touch to palpate tissue and detect abnormalities throughout the body. While this time-tested method has provided a simple diagnostic examination for large, superficial abnormalities, it does not permit quantifiable ...
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Journal ArticleMacromolecular rapid communications · February 2015
The properties of polymers near an interface are altered relative to their bulk value due both to chemical interaction and geometric confinement effects. For the past two decades, the dynamics of polymers in confined geometries (thin polymer film or nanoco ...
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Journal ArticleAdvanced functional materials · December 2013
Accelerated insertion of nanocomposites into advanced applications is predicated on the ability to perform a priori property predictions on the resulting materials. In this paper, a paradigm for the virtual design of spherical nanoparticle-filled polymers ...
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ConferenceVolume 2: Mechanics and Behavior of Active Materials; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting · September 16, 2013
Many three-dimensional constitutive models have been proposed to enhance the analysis and design of shape memory alloy (SMA) structural components. Phenomenological models are desirable for this purpose since they describe macroscopic responses usi ...
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Journal ArticlePhysical review. E, Statistical, nonlinear, and soft matter physics · August 2013
In this paper, we investigate the enhancement mechanism of the mechanical properties for hard-soft block copolymers by using molecular dynamics simulations at various temperatures. A coarse-grained approach is adopted to study sufficiently generic models. ...
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Journal ArticleJournal of Applied Mechanics · July 1, 2013
The mechanical properties of graphene oxide papers have attracted significant attention in recent years due to their high stiffness and tough behavior. While the structural feature most commonly characterized is the nanosheet spacing, there is a hi ...
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Journal ArticleApplied Physics Letters · May 27, 2013
Polycrystalline, monoclinic nickel-titanium specimens were subjected to tensile and compressive deformations while neutron diffraction spectra were recorded in situ. Using these data, orientation-specific and macroscopic Young's moduli are determin ...
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Journal ArticleJournal of the mechanical behavior of biomedical materials · May 2013
Under long-term loading creep conditions, mineralized biological tissues like bone are expected to behave in a similar manner to synthetic composites where the creeping matrix sheds load to the elastic reinforcement as creep deformation progresses. To stud ...
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Journal ArticleMaterials Science and Engineering: A · April 15, 2013
Local and global strain field maps of Nickel Titanium (NiTi) were examined during stress-induced phase transformation using digital image correlation (DIC). 2-D strain field maps of the sample surface during tensile deformation were correlated to the recov ...
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Journal ArticleAdvanced Engineering Materials · April 2013
AbstractSynchrotron X‐ray scattering is used to measure average strains in the two main nanoscale phases of cortical bone – hydroxyapatite (HAP) platelets and collagen fibrils – under tensile loading at body temperature (37 ...
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Journal ArticleNano letters · August 2012
It is commonly accepted that the addition of spherical nanoparticles (NPs) cannot simultaneously improve the elastic modulus, the yield stress, and the ductility of an amorphous glassy polymer matrix. In contrast to this conventional wisdom, we show that d ...
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Journal ArticleSmall (Weinheim an der Bergstrasse, Germany) · April 2012
An exfoliation-reassembly-activation (ERA) approach to lithium-ion battery cathode fabrication is introduced, demonstrating that inactive HCoO(2) powder can be converted into a reversible Li(1-x) H(x) CoO(2) thin-film cathode. This strategy circumvents t ...
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Journal ArticleACS nano · March 2012
The mechanical properties of pristine graphene oxide paper and paper-like films of polyvinyl alcohol (PVA)-graphene oxide nanocomposite are investigated in a joint experimental-theoretical and computational study. In combination, these studies reveal a del ...
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Journal ArticleActa biomaterialia · January 2012
While the matrix/reinforcement load-transfer occurring at the micro- and nanoscale in nonbiological composites subjected to creep deformation is well understood, this topic has been little studied in biological composites such as bone. Here, for the first ...
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Journal ArticleAdvanced materials (Deerfield Beach, Fla.) · September 2011
Adjacent graphene oxide nanosheets in a thin-film structure have been covalently cross-linked in a fashion similar to the cell walls of higher-order plants. The resulting ultra-stiff structure exhibits a maximum storage modulus of 127 GPa that can be tuned ...
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Journal ArticleACS nano · August 2011
Three mechanisms are proposed for the assembly of ordered, layered structures of graphene oxide, formed via the vacuum-assisted self-assembly of a dispersion of the two-dimensional nanosheets. These possible mechanisms for ordering at the filter-solution i ...
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Journal ArticleJournal of Polymer Science Part B: Polymer Physics · May 15, 2011
AbstractIn this article, we utilize finite element modeling to investigate the effect of nanoparticle agglomeration on the glass transition temperature of polymer nanocomposites. The case of an attractive interaction betwee ...
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Journal ArticleAdvanced Engineering Materials · May 2011
AbstractThe mechanical properties of polymers near interfaces are important in a number of different fields. For almost two decades, the local dynamics of thin polymer films have been studied in great detail. However, devel ...
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Journal ArticleBiomechanics and modeling in mechanobiology · April 2011
Bone, because of its hierarchical composite structure, exhibits an excellent combination of stiffness and toughness, which is due substantially to the structural order and deformation at the smaller length scales. Here, we focus on the mineralized collagen ...
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Journal ArticleJournal of biomechanics · January 2011
High-energy synchrotron X-ray scattering (>60 keV) allows noninvasive quantification of internal strains within bone. In this proof-of-principle study, wide angle X-ray scattering maps internal strain vs position in cortical bone (murine tibia, bovine femu ...
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ConferenceASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1 · January 1, 2011
While bulk shape memory alloys (SMAs) have proven a successful means for creating adaptive aerospace structures in many demonstrations, including live flight tests, the time required to cool such actuators has been identified as a property that cou ...
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Journal ArticleAdvanced Functional Materials · October 8, 2010
AbstractHighly ordered, homogeneous polymer nanocomposites of layered graphene oxide are prepared using a vacuum‐assisted self‐assembly (VASA) technique. In VASA, all components (nanofiller and polymer) are pre‐mixed prior ...
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Journal ArticleACS nano · July 2010
Many natural composites, such as nacre or bone, achieve exceptional toughening enhancements through the rupture of noncovalent secondary bonds between chain segments in the organic phase. This "sacrificial bond" rupture dissipates enormous amounts of energ ...
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Journal ArticleComposites science and technology · September 2009
This paper quantifies how the quality of dispersion and the quality of the interfacial interaction between TiO(2) nanoparticles and host polymer independently affect benchmark properties such as glass transition temperature (Tg), elastic modulus and loss m ...
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Journal ArticleJournal of Polymer Science Part B: Polymer Physics · July 15, 2009
AbstractDispersions of multiwalled carbon nanotubes (MWNT) in polypropylene (PP) were prepared via conventional melt batch mixing and solid‐state shear pulverization. The properties and structure of each system were assesse ...
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Journal ArticlePolymer Engineering & Science · March 2009
AbstractIn this article, we develop an aqueous electrode technique that can adapt to complex sample geometries while maintaining perfect contact between the electrodes and the measured sample. In contrast to surface deposit ...
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Journal ArticleJournal of Polymer Science Part B: Polymer Physics · February 2009
AbstractThis article presents experimental results and model predictions of the mechanical response of polymers during nonisothermal physical aging. The nonisothermal temperature history leads to a complex evolution in the ...
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ConferenceVolume 12: Micro and Nano Systems, Parts A and B · January 1, 2009
As revealed by experimental data on ultrathin polymer films [1, 2], polymer mobility changes in a gradient fashion away from the polymer-surface interface. However, little is yet known on gradients in mechanical properties in polymer nanocomposites ...
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Journal ArticleComposites science and technology · July 2008
The macroscale properties of polymer-matrix composites depend immensely on the quality of the interaction between the reinforcement phase and the bulk polymer. This work presents a method to improve the interfacial adhesion between metal-oxides and a polym ...
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Journal ArticleNature nanotechnology · June 2008
Polymer-based composites were heralded in the 1960s as a new paradigm for materials. By dispersing strong, highly stiff fibres in a polymer matrix, high-performance lightweight composites could be developed and tailored to individual applications. Today we ...
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Journal ArticleJournal of biomedical materials research. Part A · February 2008
Porous titanium with elongated and aligned pores, mimicking the anisotropic structure of bone, was created by solid-state expansion of argon trapped in elongated pores between titanium wires. Both elastic moduli and yield strengths are larger in the longit ...
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Journal ArticleJournal of Polymer Science Part B: Polymer Physics · August 2007
AbstractMechanical, thermal, and electrical properties of graphite/PMMA composites have been evaluated as functions of particle size and dispersion of the graphitic nanofiller components via the use of three different graph ...
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Journal ArticleJournal of Applied Mechanics · September 1, 2006
In this paper, we present a novel hybrid numerical-analytical modeling method that is capable of predicting viscoelastic behavior of multiphase polymer nanocomposites, in which the nanoscopic fillers can assume complex configurations. By combining ...
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Journal ArticleMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science · January 1, 2006
The phase-transformation temperatures of a nickel-titanium-based shape-memory alloy (SMA) were initially evaluated under stress-free conditions by the differential scanning calorimetric (DSC) technique. Results show that the phase-transformation temperatur ...
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Journal ArticleActa biomaterialia · September 2005
While titanium has been clinically successful as an orthopedic or dental implant material, performance problems still persist related to implant-bone interfacial strength and mechanical modulus mismatch between titanium and tissue. We describe here the pre ...
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Journal ArticleJournal of Polymer Science Part B: Polymer Physics · September 2005
AbstractIn this paper, we present results for polymer nanocomposites of poly‐ (methyl methacrylate) (PMMA) and amide‐functionalized SWNTs. The results demonstrate that even at very low loadings, 1 wt % (0.5 vol %), the mech ...
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Journal ArticleJournal of biomedical materials research. Part A · June 2004
This article investigates mechanics issues related to potential use of a recently developed porous titanium (Ti) material for load-bearing implants. This material may have advantages over solid Ti of enhancing the bone-implant interface strength by promoti ...
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Journal ArticleAdvanced Composites Letters · March 2004
The impact of embedded carbon nanotubes on the effective viscoelastic response of a nanotube-reinforced polycarbonate system is characterized by studying the temperature- and frequency-dependent behaviour of the material. Macroscale experimental r ...
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Journal ArticleJournal of Applied Physics · June 15, 2003
A thermodynamic approach is used to develop a framework for modeling uranium–niobium alloys under the conditions of high-strain rate. Using this framework, a three-dimensional phenomenological model, which includes nonlinear elasticity (equation of ...
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Journal ArticleJournal of Intelligent Material Systems and Structures · December 2002
The Multivariant model describing shape memory alloy (SMA) constitutive behavior is further developed in this paper for improved prediction of thermomechanical response. In the original formulation of the Multivariant model, an interaction energy, ...
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Journal ArticleJournal of Intelligent Material Systems and Structures · December 2002
The micro and macromechanical transformation behavior of single and polycrystalline shape memory alloys was investigated using in situ optical microscopy. An interference filter was used on the microscope to enhance observation of grain boundaries ...
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Journal ArticleApplied Physics Letters · June 17, 2002
Recent experimental results demonstrate that substantial improvements in the mechanical behavior of polymers can be obtained using very small amounts of carbon nanotubes as a reinforcing phase. Here, a method is developed to incorporate the typical ...
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Conference · January 1, 2000
An experimental and analytical study was performed on the use of tension stress relaxation to characterize the effects of elevated temperature and physical aging on the linear viscoelastic behavior of IM7/K3B. Isothermal stress relaxation tests on ...
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Journal ArticlePolymer Engineering & Science · February 1999
AbstractThe mechanical response of a material undergoing isothermal physical aging is governed by a reference curve (typically time‐dependent modulus or compliance) and a shift rate (which describes the rate of aging). In t ...
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Journal ArticleJournal of Intelligent Material Systems and Structures · May 1998
In this paper we further explore the thermoinduced shape memory alloy transformation using a model developed in a previous publication. The problem investigated in detail is that of a semi-infinite SMA rod under uniaxial tension, subjected to boun ...
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Conference · January 1, 1998
Pultruded glass-fiber-reinforced vinyl ester composite coupons were subjected to four-point-bend environmental fatigue to study their long-term durability for infrastructure applications. Specimens were tested dry and while immersed in water and in ...
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Journal ArticleJournal of Composite Materials · December 1997
To help address the lack of engineering data on the time-dependent behavior of advanced polymeric composites, a combined experimental and analytical research program was initiated to investigate the similarities and differences of the effects of p ...
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Journal ArticleJournal of Engineering Materials and Technology · July 1, 1997
For isothermal physical aging, a few simple tests to characterize the aging shift factors allow reasonable prediction of the mechanical response. In this paper, a new technique is developed to extract aging shift factors from creep data during a no ...
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Journal ArticlePolymer Engineering & Science · January 1997
AbstractThe ability to include the effects of physical aging is critical to the design of engineering structures involving advanced polymers and polymer composites. Physical aging, a phenomenon caused by material evolution ...
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Journal ArticleJournal of Intelligent Material Systems and Structures · January 1997
In this paper the active control of beam deflection through heating and cooling of Shape Memory Alloy (SMA) wires is examined. A phenomenological constitutive law for SMA wires is coupled with beam theory to provide predictions of beam shape upon ...
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Journal ArticleJournal of Intelligent Material Systems and Structures · January 1996
In this paper, a macro-scale, phenomenological constitutive model for shape memory alloys is used in conjunction with energy balance equations to study the evolution of temperature and deformation profiles seen in SMA wires under specific thermal ...
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Journal ArticleJournal of Intelligent Material Systems and Structures · January 1996
Here we will present a simplification of the form of one popular shape memory alloy (SMA) constitutive model. This simplification allows a more compact written form and hence easier calculations with the one-dimensional SMA constitutive law first ...
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Journal ArticleJournal of Applied Mechanics · December 1, 1992
The properties of composite solids containing multiple, viscoelastic phases are studied numerically. The dynamic correspondence principle of viscoelasticity is utilized in a finite element model to solve boundary value problems for obtaining global ...
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