Affiliation:
1. Tamagawa University
2. Akita Prefectural University
Abstract
A viscoplastic constitutive equation based on the kinematic hardening creep theory of
Malinin-Khadjinsky and the nonlinear kinematic hardening rule of Armstrong-Frederick is
formulated to describe the inelastic behavior of high-density polyethylene under various loading. The
gentle progress of back stress by the introduction of loading surface in the viscoplastic strain space
and smaller material constant under unloading can be expressed. Material constants are identified by
various stress-strain curves under compression at constant strain rate and creep curves under
compression at constant stress. The viscoplastic model can describe stress-strain curve under
compression with change in strain rate and shear stress-strain curve including unloading. The model
can qualitatively describe stress-strain curves under compression with changed strain rate including
unloading, but it is quantitatively insufficient.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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