6th. Int. Conf. on Thermal, Mechanical and Multiphysics Simulation and Experiments in Micro-Electronics and Micro-Systems, pp. 510-514, EuroSimE, April 2005

Hybrid Experimental and Computational Approach for Rate Dependent Mechanical Properties Using Indentation Techniques

J. Varghese, G. Radig, D. Herkommer, and A. Dasgupta
CALCE EPSC
University of Maryland
College Park, MD 20742

Abstract:

This paper introduces a hybrid test methodology, based on dynamic indentation, to determine the high strain rate properties of materials. A conical indentation test setup, with real time measurement of load and indent depth, is developed for this purpose. Tests are conducted to obtain the load ĘC displacement (P-h) curves at different loading rates. Non-linear dynamic finite element analysis (FEA), using an iterative inverse solution technique, is used to convert the experimental data into stress-strain curves at different strain rates. The inverse solution technique involves varying the stress-strain curves until the the load-displacement curves obtained from simulation matches the experimentally measured data.

Results indicate that the uni-axial dynamic characterization tests under-predict the material properties of the specimen, when compared to the indentation tests. This is important for the characterization of materials that experience localized plasticity; eg. Structures subjected to drop and impact.

Complete article is available to CALCE Consortium Members.

 



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