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A Novel Mechanical Method to Measure Shear Strength in Specimens Under Pressure

Published online by Cambridge University Press:  01 February 2011

Juan Pablo Escobedo ,
David Field ,
David Lassila  and
Mary Leblanc
Juan Pablo Escobedo
Affiliation:
jescobedo@wsu.edu, Washington State University, Mechanical and Materials Engineering, Spokane and College, Pullman, WA, 99164, United States, 509-335-2436
David Field
Affiliation:
dfield@wsu.edu, Washington State University, Mechanical and Materials Engineering, Spokane and College, Pullman, WA, 99164, United States
David Lassila
Affiliation:
lassila1@llnl.gov, Lawrence Livermore National Laboratory, Livermore, Ca, 94550, United States
Mary Leblanc
Affiliation:
leblanc2@llnl.gov, Lawrence Livermore National Laboratory, Livermore, Ca, 94550, United States
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Abstract

A new experimental apparatus has been developed for performing shear tests on specimens held under moderately high hydrostatic pressures (on the order of 4 GPa). This testing procedure experimentally determines the pressure-dependent shear strength of thin foil specimens. The experiments provide calibration data for models of materials subjected to extreme pressures such as the Steinberg-Guinan hardening model and can assist in model validation for discrete dislocation dynamics simulations, among others. This paper reports the development of the experimental procedures and the results of initial experiments on thin foils of polycrystalline Ta performed under hydrostatic pressures ranging from 1 to 4 GPa. Both yielding and hardening behavior of Ta are observed to be sensitive to the imposed pressure.

Keywords

Tastress/strain relationshipstrength
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 929: Symposium II – Materials in Extreme Environments , 2006 , 0929-II03-01
Copyright
Copyright © Materials Research Society 2006

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