An Experimentally Based Unified Model for Isothermal and Thermo-mechanical Loading
by
Donald Slavik
Abstract
I. INTRODUCTION
Engineering components are subjected to a variety of temperature and strain or stress histories in service. These histories may produce material damage that could lead to component failure. The needs of the nuclear, ground vehicle, and aerospace industries have stimulated research work in developing constitutive models to predict material stress-strain behavior under isothermal and non-isothermal loading conditions [1-3]. A general constitutive model should accurately predict observed isothermal material behavior phenomena such as cyclic transient hardening or softening to a stable state, mean stress relaxation under mean strain cycling, strain rate sensitivity, strain ratchetting under mean stress cycling, stress relaxation under strain holds, and creep behavior under stress holds [4]. The model should also be able to simulate multiaxial material response and complex temperature-strain histories.
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