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MODELLING OF DYNAMIC STRAIN AGING WITH A DISLOCATION-BASED ISOTROPIC HARDENING MODEL AND INVESTIGATION OF ORTHOGONAL LOADING

Based on experimental results, a dislocation material model describing the dynamic strain aging 
effect at different temperatures is presented. One and two stage loading tests were performed in 
order to investigate the influence of the loading direction as well as the temperature influence due 
to the hardening mechanism. Bergstrom’s theory of work hardening was used as a basis for the 
model development regarding the thermal isotropic behavior as well as the Chaboche model to 
describe the kinematic hardening. Both models were implemented in an in-house FE-Code in 
order to simulate the real processes. The present paper discusses two hardening mechanisms, 
where the first part deals with the pure isotropic hardening including dynamic strain aging and the 
second part involves the influence of the loading direction regarding combined (isotropic and 
kinematic) hardening behavior.