Comparison of Dynamic Hardening Equations for Metallic Materials with three types of Crystalline Structures
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Date
2012-07-18
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Abstract
This paper is concerned with dynamic hardening equations of metallic materials with various
crystalline structures. The dynamic response of metallic materials is indispensable for
analysis of high speed metal forming process. There is, however, no unique equation which
can represent the dynamic hardening characteristics of all kinds of materials although
various dynamic hardening equations have been suggested by many researchers. Dynamic
hardening equations reported have been investigated using the dynamic hardening
characteristics of three kinds of materials: 4340Steel (BCC); OFHC (FCC); and Ti6Al4V
(HCP). Dynamic hardening characteristics of each material have been obtained by uniaxial
tensile tests and SHPB tests. Uniaxial tensile tests have been performed with the variation of
the strain rate from 0.001/sec to 100/sec and SHPB tests have been conducted at the strain
rate ranged up to 4000/sec. Several existing models have been constructed and evaluated
for Johnson-Cook model, Zerilli-Armstrong model, Preston-Tonks-Wallace model, modified
Johnson-Cook model, and modified Khan-Huang model using test results of three materials.
Strain rate hardening and thermal softening effect during the deformation process were
investigated for accurate application of hardening equations. The most applicable equation
for each material has been suggested by comparison of constructed results.
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Keywords
dynamic hardening equation, high speed tensile test, strain rate sensitivity