Abstract
The circular and oval hole expansion behaviors of JSH440W and JSH590R high-strength steel sheets were investigated based on experiments and finite element (FE) simulations using three types of anisotropic yield functions: Hill48-r, Yld2000-2d, and 6-poly models. The effects of anisotropy evolution were specifically examined by performing FE simulation using the 6-poly anisotropic hardening (AH) model. Sheet-direction dependent workhardening characteristics were determined by using an in-plane stretch-bending technique. From this work, it was found that hole expansion behavior was strongly affected by anisotropy and its evolution. Thus, it is concluded that the use of AH model is essential for the accurate simulation of hole expansion processes.
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