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Non-admissible states in non-associated thermo-plasticity of hardening materials
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DOI：10.1016/j.ijplas.2026.104755.png)
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Abstract
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• We clarify conditions of occurrence of unforeseen stress softening for Armstrong–Frederick law. • For saturating laws, non-admissible plastic states can be reached from temperature changes. • A bi-isothermal test is formulated as a thought experiment to highlight such spurious effects. • A power-law-like non-saturating kinematic hardening law is proposed. • The proposed law ensures an always positive plastic modulus and forbids spurious stress softening.
Keywords:
Drucker stability
Intrinsic dissipation
Kinematic hardening
Loading–unloading condition
Thermomechanical loading
von Mises plasticity
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