Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 26, Issue 7, Pages 939-956Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2009.11.006
Keywords
Dual phase steel; TRIP steel; Finite strain; Plasticity; Multi-axial testing
Funding
- MIT/industry Advanced High Strength Steels (AHSS) Fracture Consortium
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The accuracy of quadratic plane stress plasticity models is evaluated for a dual phase and a TRIP-assisted steel. Both sheet materials exhibit a considerable direction-dependence of the r-ratio while the uniaxial stress-strain curves are approximately the same irrespective of the specimen direction. Isotropic and anisotropic associated as well as non-associated quadratic plasticity models are considered to describe this behavior. Using a newly-developed dual-actuator system, combinations of normal and tangential loads are applied to a flat specimen in order to characterize the sheet material response under more than 20 distinct multi-axial loading states. The comparison of the experimental results with the plasticity model predictions reveals that both the associated and non-associated quadratic formulations provide good estimates of the stress-strain response under multi-axial loading. However, the non-associated model is recommended when an accurate description of the thinning behavior is important. Moreover, a structural validation example is presented that demonstrates the higher prediction accuracy of the non-associated plasticity model. (c) 2009 Elsevier Ltd. All rights reserved.
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