Numerical analysis of plastic strain distribution through multi-directional deformation

The plastic strain in a specimen introduced by compression with a pair of a nvils is evaluated using a three-dimensional dynamic finite element analysi s. The stress-strain relations depending on strain rate and temperature are used in the analysis. The contact condition between the anvil and the spec imen is determined from the experimental result from an identically deforme d screw set in the specimen. The plastic strain introduced by uni-direction al compression is compared with that by bi-directional compression non-simu ltaneously given from different directions. The bi-directional deformation is proposed as a method to introduce large plastic strain widely in the spe cimen. The bi-directional deformation can be developed as a technique to ob tain ultra-fine grain steels for thick plates.