Nonlinear behavior in dynamic nanoindentation
Numerical studies of Eq. (1), performed for several excitation voltage levels, show that the combination of transducer mechanical and electrostatic nonlinearity as well as the interaction force nonlinearity provide a significant source of error in dynamic nanoindentation. To provide a graphical example, the response amplitude and phase results from a VDC = 15 [V] and VAC = 13 [V] excitation are shown in Fig. 2. This figure shows that the response at the first harmonic, a result of nonlinearity in the system, is sometimes larger than response amplitude at the excitation frequency; therefore, significant errors can occur when identifying the material behavior under the assumption of a linear system model.
Proceedings of the 20th Annual ASPE Meeting, ASPE 2005