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Title of Journal: Exp Mech

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Abbravation: Experimental Mechanics

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Springer US

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DOI

10.1007/bf01739910

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1741-2765

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Effect of Varying Test Parameters on Elastic–plast

Authors: L Ladani E Harvey S F Choudhury C R Taylor
Publish Date: 2013/03/01
Volume: 53, Issue: 8, Pages: 1299-1309
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Abstract

A systematic experiment was performed in an effort to investigate how the levels of certain test parameters affect the values of elastic modulus hardness yield stress and strain hardening constant obtained using nanoindentation test Maximum applied load loading unloading rate and hold time at maximum load were varied at three levels The effects of these testing parameters were investigated through a threelevel full factorial design of experiment The experiments were conducted on ultrafine AlMg specimens that were mechanically extruded Both longitudinal and transverse extrusion directions were examined to investigate effects of anisotropy on mechanical properties and evaluate the persistence of observed variations due to test parameters on different materials orientations An indentation size effect ISE was observed demonstrating that maximum load—and thereby maximum indentation depth—can have a significant effect on values of hardness and elastic modulus Hardness values decreased with higher loading rates and higher rates of unloading resulted in higher values of elastic modulus 5–10 GPa increases Strainhardening exponent showed a decreasing trend with increasing loading rate while yield stress exhibited a consistent correlation to hardness across all studied parameters The material exhibited very little creep during the hold period and values of the calculated properties were not significantly altered by varying the length of the hold time Anisotropy effect was observed particularly in the values of yield strength This is attributed to the preferred grain orientation due to extrusionThe authors would like to acknowledge the National Science Foundation for support of this research This material is based upon work supported by the National Science Foundation under Grant No 1053434 This work used resources in the Center for Materials for Information Technology which is supported by The University of Alabama

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