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Meeting MS&T21: Materials Science & Technology
Symposium Light Metal Technology
Presentation Title EPSC Model with Back Stress Development to Capture Multi-strain-path Behavior of AA6016-T4
Author(s) Rishabh Sharma, Dane Sargeant, Sowmya Daroju, Marko Kenezevic, Michael Miles, David Fullwood
On-Site Speaker (Planned) Rishabh Sharma
Abstract Scope The development of internal stresses during forming causes deformation behavior and final geometry characteristics that are hard to predict using conventional models. Such stresses can manifest in the Bauschinger effect, springback, and residual stresses. A recently developed elastoplastic self-consistent (EPSC) model incorporates internal stresses to accurately simulate the material response. To-date it has been employed to model cyclical loading and deep drawing of AA6022-T4. The current study assesses the performance of an EPSC model for deformation via uniaxial, plane, and biaxial strain paths in AA6016-T4. The response to strain paths was examined by pre-straining under tension, biaxial and plane-strain loading conditions, followed by uniaxial tension. The predictions closely matched experimental results. Furthermore, geometrically necessary dislocation density in the experimental specimens was compared with EPSC predicted dislocation evolution. The inclusion of internal stresses in the model led to successful prediction of hardening in AA6016-T4 samples upon a change in strain path.


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