2014 Volume 55 Issue 640 Pages 429-434
In the finite element analysis (FEA) of high-speed forming for rate-sensitive materials, the accuracy significantly depends on tensile testing data obtained at high-strain-rate. The measurement accuracy of the testing data depends on the design of the specimen geometry. In this study, the effects of important parameters of the specimen geometry, i.e., parallel length, the width of the parallel part, and the radius of the transition zone, on the measurement accuracy were investigated by dynamic explicit FEAs for three different sets of material parameters. The results of the FEAs in the present study revealed the range of optimal specimen geometry. Additionally, the result showed that the consideration of work hardenability is important for the optimization of the specimen geometry. Finally, our prediction by the present simulations was experimentally verified by tensile test performed at high-strain-rate.
