ConferenceLecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics · January 1, 2022
In the early days of the COVID-19 pandemic, there was a pressing need for an expansion of the ventilator capacity in response to the COVID19 pandemic. Reserved for dire situations, ventilator splitting is complex, and has previously been limited to patient ...
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ConferenceTechniques in orthopaedics (Rockville, Md.) · September 2017
Interbody fusion cages are routinely implanted during spinal fusion procedures to facilitate arthrodesis of a degenerated or unstable vertebral segment. Current cages are most commonly made from polyether-ether-ketone (PEEK) due to its favorable mechanical ...
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ConferenceTechniques in Orthopaedics · January 1, 2017
Shape-memory polymers (SMPs) and their medical devices offer improved performance for soft-tissue fixation because of their ability to expand in vivo. Here, we describe the basics of the SMP cycle and the fundamental biomechanics of SMP soft-tissue fixatio ...
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ConferenceTechniques in orthopaedics (Rockville, Md.) · September 2016
Three-dimensional (3-D) printing offers many potential advantages in designing and manufacturing plating systems for foot and ankle procedures that involve small, geometrically complex bony anatomy. Here, we describe the design and clinical use of a Ti-6Al ...
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ConferenceCAMX 2015 - Composites and Advanced Materials Expo · January 1, 2015
Copyright 2015 by Raytheon Company. Published by CAMX-The Composites and Advanced Materials Expo with permission.Raytheon has developed a thermoplastic polyurethane (TPU) shape memory polymer (SMP) suitable for 3D printing via fused deposition modeling (FD ...
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ConferenceCamx 2015 Composites and Advanced Materials Expo · January 1, 2015
Raytheon has developed a thermoplastic polyurethane (TPU) shape memory polymer (SMP) suitable for 3D printing via fused deposition modeling (FDM®). After printing, the final part may be warmed above its glass transition temperature (Tg), packaged into a te ...
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ConferenceASME 2012 Conference on Smart Materials Adaptive Structures and Intelligent Systems Smasis 2012 · December 1, 2012
In this paper a micro-mechanical model that incorporates single crystal constitutive relationships is used for studying the pseudoelastic response of polycrystalline shape memory alloy beams subjected to bending. In the micro-mechanical framework, the stre ...
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ConferenceProceedings of SPIE the International Society for Optical Engineering · June 6, 2012
A macroscopic phenomenological framework is used for developing a closed-form solution for analyzing the pure bending of shape memory alloy (SMA) beams. In order to study the effect of tension-compression asymmetry on the bending response, two different tr ...
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ConferenceMaterials Research Society Symposium Proceedings · January 1, 2009
The goal of this study is to investigate the fundamental relationship between the extent of crosslinking and shape-memory behavior of amorphous, (meth)acrylate-based polymer networks. The polymer networks were produced by copolymerization of tert-butyl acr ...
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ConferenceSmst 2006 Proceedings of the International Conference on Shape Memory and Superelastic Technologies · December 1, 2008
Nickel-titanium (NiTi) shape memory alloys undergo relatively large recoverable inelastic deformations via a stress-induced martensitic phase transformation. Although stress-induced phase transformations in shape memory alloys are well characterized and ut ...
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ConferenceAdvances in Heterogeneous Material Mechanics 2008 Proceedings of the 2nd International Conference on Heterogeneous Material Mechanics Ichmm 2008 · November 28, 2008
Shape-memory acrylate networks are novel materials for both biomedical and industrial applications. The purpose of this study is to understand how the chemical structure dictates thermo-mechanical properties of shape-memory acrylate networks, specifically ...
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ConferenceAdvances in Heterogeneous Material Mechanics 2008 Proceedings of the 2nd International Conference on Heterogeneous Material Mechanics Ichmm 2008 · November 28, 2008
Shape memory polymer (SMP) foams have low density, high compressibility, and shape memory properties that give them a wide range of potential applications. However, their thermo-mechanical and structural behavior is not well understood. We investigated epo ...
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ConferenceAsmc Advanced Semiconductor Manufacturing Conference Proceedings · August 15, 2008
Shape memory polymers are of interest as high-capacity information storage media. This research seeks to understand the effects of processing conditions on the following candidate polymers: diethylene glycol dimethacrylate (DEGDMA), tertbutyl acrylate (tBA ...
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ConferenceInternational SAMPE Technical Conference · December 1, 2007
The thermal properties of an epoxy SMF (shape memory polymer foam) are measured and reported for an 18% dense foam, and it was found that the thermal diffusivity increased by an order of magnitude in going from fully expanded to fully compressed, while the ...
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ConferenceInternational SAMPE Technical Conference · December 1, 2007
Adaptive (shape memory) polymer foams have potential aerospace applications, but their thermo-mechanical behavior under deformation conditions is not well understood. We examined epoxy adaptive foams with an average relative density near 20% by deforming t ...
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ConferenceThin Solid Films · February 12, 2007
MEMS microcantilever test structures were utilized to examine the microstructural evolution of Au/Cr/Si thin films subject to annealing. Curvature evolution of the micron-sized structures was measured in response to anneals at various times and temperature ...
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ConferenceThin Solid Films · February 12, 2007
The structure and composition of Au/Cr/Si microcantilevers were examined both before and after annealing. The microstructural observations are used to explain the sophisticated curvature-temperature relationships presented in Part I of this paper series. F ...
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ConferenceProceedings Electronic Components and Technology Conference · December 22, 2006
Integral discrete passives occupy nearly 45% of the board real estate. By embedding passives we have the following advantages: improving packaging efficiency & electrical performance, reducing the use of printed wiring board real estate, eliminating assemb ...
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ConferenceSensors and Actuators A Physical · August 14, 2006
Mechanical characterization of atomic layer deposited (ALD) alumina (Al2O3) for use in micro- and nano-electromechanical systems has been performed using several measurement techniques including: instrumented nanoindentation, bulge te ...
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ConferenceMaterials Research Society Symposium Proceedings · May 8, 2006
Nickel-titanium (NiTi) shape memory alloys undergo relatively large recoverable inelastic deformations via a stress-induced martensitic phase transformation. The nanoindentation experimental results presented in this study are the first to show evidence of ...
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ConferenceProceedings of SPIE the International Society for Optical Engineering · May 3, 2006
We have studied the corrosion of phosphorus-doped polySi when contacted to a gold metallization layer and exposed to various hydrofluoric acid (HF) based chemistries, including mixtures with HCI, C 2H 6O, H 2O, NH 4
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ConferenceMedical Device Materials II Proceedings of the Materials and Processes for Medical Devices Conference 2004 · December 1, 2005
The objective of this study is to examine the effect of heat treatment on polycrystalline Ti-50.9 at.%Ni in hot-rolled and cold-drawn states. In particular we examine microstructure, transformation temperatures and mechanical behavior of deformation proces ...
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ConferenceAmerican Society of Mechanical Engineers Micro Electro Mechanical Systems Division Publications MEMS · December 1, 2005
Mechanical, and electrical effects generated by the galvanic corrosion of polysilicon immersed in various hydrofluoric acid (HF)-based solutions are described. Micromachined test structures consisting of phosphorus-doped polysilicon in contact with a gold ...
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ConferenceMedical Device Materials II Proceedings of the Materials and Processes for Medical Devices Conference 2004 · December 1, 2005
The introduction of shape memory alloys (SMA) as an active implant material has greatly advanced the medical industry. The most heavily utilized SMA in biomedical applications is nickel titanium (NiTiNOL) due to its ability to instantaneously recover large ...
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ConferenceProceedings of SPIE the International Society for Optical Engineering · September 29, 2005
The use of smart materials and multifunctional components has the potential to provide enhanced performance, improved economics, and reduced safety concerns for applications ranging from outer space to subterranean. Elastic Memory Composite (EMC) materials ...
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ConferenceMaterials Research Society Symposium Proceedings · January 1, 2005
The shape-memory effect was examined in polymer stents intended for cardiovascular applications. Four polymer networks were synthesized from polyethylene glycol) dimethacrylate and tert-butyl acrylate with 10 wt% and 20 wt% crosslinker, and with glass tran ...
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ConferenceMechanics of Materials · October 1, 2004
Shape memory polymers (SMPs) have the capacity to recover large strains when pre-deformed at an elevated temperature, cooled to a lower temperature, and reheated. The thermomechanical behavior of SMPs can be tailored by modifying the molecular structure of ...
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ConferenceAnnual Proceedings Reliability Physics Symposium · July 12, 2004
The magnitude and physics of inelastic behavior of Au/Si microelectromechanical structures at various thermomechanical loading conditions were investigated. Bimorph gold and polysilicon cantilever beams were fabricated by commercial foundry process. The cu ...
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ConferenceProceedings of SPIE the International Society for Optical Engineering · May 10, 2004
We examine creep of thin film Au on curved bimaterial Au/Si microcantilevers. Time-dependent inelastic strains in the Au film lead to gradual changes in the microcantilever curvature over time. Curvature- temperature-time experiments are used to examine th ...
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ConferenceMechanics of Materials · January 1, 2004
Multi-layer material structures in micro-electromechanical systems (MEMS) differ considerably from their micro-electronic counterparts since the thicknesses of the film and substrate are comparable. Due to thermal expansion coefficient mismatch between met ...
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ConferenceIEEE International Reliability Physics Symposium Proceedings · January 1, 2004
Our work with micromechanical structures investigates the magnitude and physics of inelastic behavior at various thermomechanical-loading conditions. We also seek to achieve greater mechanical stability, for example using nanometer-thick atomic-layer depos ...
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ConferenceMaterials Research Society Symposium Proceedings · January 1, 2004
Shape memory polymers (SMPs) have the capacity to store and recover relatively large strains when subjected to a unique thermomechanical cycle. In this study, the thermomechanics of strain storage and strain/stress recovery are investigated in a shape memo ...
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ConferenceMaterials Research Society Symposium Proceedings · January 1, 2004
The purpose of this study is to investigate the structure and properties of polycrystalline NiTi in its cast form. Although it is commonly stated in the literature that cast NiTi has poor shape-memory behavior, this study demonstrates that with appropriate ...
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ConferenceMaterials Research Society Symposium Proceedings · January 1, 2004
We examine the shape-memory effect in polymer networks intended for biomedical applications. The polymers were photopolymerized from tert-butyl acrylate (tBA) with polyethyleneglycol dimethacrylate (PEGDMA) acting as a crosslinker. Three-point flexural tes ...
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ConferenceMaterials Research Society Symposium Proceedings · January 1, 2004
Au/Cr/Si microcantilevers were studied in their as-deposited condition and annealed state, with emphasis on a thermal treatment of 225 °C for 24 hours. Change in beam curvature was monitored during isothermal hold as a function of time. Secondary grain gro ...
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ConferenceMaterials Research Society Symposium Proceedings · January 1, 2004
First-principle, tight binding, and semi-empirical embedded atom calculations are used to investigate a tetragonal phase transformation in gold nanowires. As wire diameter is decreased, tight binding and modified embedded atom simulations predict a surface ...
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ConferenceAmerican Society of Mechanical Engineers Micro Electro Mechanical Systems Division Publications MEMS · January 1, 2004
The addition of a noble metallization layer to doped polysilicon results in the formation of a galvanic cell when the composite is submerged in aqueous hydrofluoric acid. A corrosion current created by the galvanic cell promotes the electrochemical etching ...
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ConferenceMaterials Research Society Symposium Proceedings · January 1, 2004
The objective of this study is to examine the effect of heat treatment on polycrystalline Ti50.9 at.%Ni subsequent to hot-rolling. In particular we examine microstructure, transformation temperatures and mechanical behavior of deformation processed NiTi. T ...
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Conference44th AIAA ASME ASCE AHS ASC Structures Structural Dynamics and Materials Conference · December 1, 2003
Spacecraft require a variety of separation and release devices to accommodate separation from the launch vehicle and deployment of solar arrays and other appendages. Pyrotechnic release devices produce high shock and contamination, are hazardous and costly ...
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Conference44th AIAA ASME ASCE AHS ASC Structures Structural Dynamics and Materials Conference · December 1, 2003
This paper describes an engineering program for the development of a seven-meter-long Elastic Memory Composite (EMC), Storable Tubular Extendible Member (STEM) boom, and its deployment-control system. EMC STEM booms have the potential to be much larger, in ...
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ConferenceMedical Device Materials Proceedings of the Materials and Processes for Medical Devices Conference 2003 · December 1, 2003
Nickel titanium (NiTi) shape memory alloys, also referred to as Nitinol, have been used in various medical applications owing to their ability to recover large stratins and their relatively strong chemical and mechanical bio-compatibility. Amongst other th ...
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ConferenceMedical Device Materials Proceedings of the Materials and Processes for Medical Devices Conference 2003 · December 1, 2003
We present new results on the thermomechanical packaging and recovery behavior of shape memory polymers (SMPs) for medical applications. SMPs possess the ability to store and recover large strains by the application of a prescribed thermomechanical cycle. ...
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ConferenceAnnual Proceedings Reliability Physics Symposium · July 21, 2003
The effect of Al203 atomic layer deposition (ALD) nanocoatings on the thermo-mechanical behavior of Au/Si microelectromechanical systems (MEMS) structures was discussed. The gold/polysilicon (Au/Si) beam structures were fabricated usi ...
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ConferenceJournal De Physique IV JP · January 1, 2003
Aging under applied stress of <111> and <122> Ti-51at.%Ni single crystals leads to the formation of one crystallographic variant of Ti3Ni4 particles, but after aging without stress four particle variants are observed. It has been show ...
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ConferenceCollection of Technical Papers AIAA ASME ASCE AHS ASC Structures Structural Dynamics and Materials Conference · January 1, 2003
Spacecraft require a variety of separation and release devices to accommodate separation from the launch vehicle and deployment of solar arrays and other appendages. Pyrotechnic release devices produce high shock and contamination, are hazardous and costly ...
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ConferenceCollection of Technical Papers AIAA ASME ASCE AHS ASC Structures Structural Dynamics and Materials Conference · January 1, 2003
This paper describes an engineering program for the development of a seven-meter-long Elastic Memory Composite (EMC), Storable Tubular Extendible Member (STEM) boom, and its deployment-control system. EMC STEM booms have the potential to be much larger, in ...
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ConferenceIEEE International Reliability Physics Symposium Proceedings · January 1, 2003
In the present study we examine the effect of different thermal hold temperatures on creep and stress relaxation during the first thermal cycle and the effect of maximum cycling temperature on thermal ratcheting. We also explore the use of Atomic Layer Dep ...
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Conference19th AIAA Applied Aerodynamics Conference · December 1, 2001
Polymer matrix Elastic Memory Composite (EMC) materials show great potential for use as ultra-light weight deployable structures for space applications. Critical to acceptance of these materials is the ability to efficiently package these materials for lau ...
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ConferenceMaterials Science and Engineering A · September 15, 2001
Single crystals of NiTi (with 50.8 at.% Ni) were subjected to cyclic loading conditions at room temperature which is above the Ms (martensite start) temperature of - 30°C. The single crystals exhibited remarkable cyclic hardening under zero to c ...
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ConferenceCollection of Technical Papers AIAA ASME ASCE AHS ASC Structures Structural Dynamics and Materials Conference · January 1, 2001
Polymer matrix Elastic Memory Composite (EMC) materials show great potential for use as ultra-light weight deployable structures for space applications. A detailed investigation on the micro-mechanisms of deformation in EMC materials is presented. The resu ...
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ConferenceIEEE Aerospace Conference Proceedings · January 1, 2001
Near-term and future spacecraft and satellites will require large ultra-lightweight structures and components that must be efficiently packaged for launch and reliably deployed on orbit. A new material technology called Elastic Memory Composite (EMC) mater ...
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Conference19th AIAA Applied Aerodynamics Conference · January 1, 2001
Polymer matrix Elastic Memory Composite (EMC) materials show great potential for use as ultra-light weight deployable structures for space applications. Critical to acceptance of these materials is the ability to efficiently package these materials for lau ...
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ConferenceProceedings of SPIE the International Society for Optical Engineering · January 1, 2000
The next generation of shape memory alloy constitutive models must explicitly or implicitly account for the physics of deformation. Such thermodynamic based micro-mechanical or internal state variable models yield a class of constitutive models with predic ...
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ConferenceJournal of Engineering Materials and Technology Transactions of the ASME · January 1, 2000
We present a formal methodology to integrate basic materials research results into a design procedure for engineering components. Although the methodology is generic, we demonstrate its development and application in designing a cast automotive control arm ...
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ConferenceProceedings of the TMS Fall Meeting · December 1, 1997
Modeling of fatigue crack growth processes require calculations of crack tip stress fields, including the influence of premature crack contact and crack opening displacements. Two problems that have been of recent interest to the senior author will be desc ...
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