Shiro Kobayashi

TL;DR: In this article, a theory based on the extremum principle for rigid perfectly plastic materials is given for the analysis of three-dimensional deformation in rolling, and theoretical solutions are obtained for single-pass rolling in terms of sideways spread, roll torque and the location of neutral points.

TL;DR: In this paper, a thermodynamic theory of deformation using internal variables is adapted to rigid viscoplastic materials, and the formulations for finite element discretization are given specifically for metal forming problems.

TL;DR: In this article, the finite element formulations for coupled analysis of deformation and heat transfer are applied to the problems of solid cylinder compression and ring compression, and the results of ring compression of aluminum at elevated temperature are compared with experimental observations as well as with calculated results not including the temperature effects.

TL;DR: In this article, the authors applied theories on flow and fracture in metalworking processes to prediction of workability of materials in axisymmetric bar extrusion and drawing, with special reference to central bursting.

TL;DR: In this article, a finite-element procedure is developed for modeling the square cup drawing process based on finite strain formulation and membrane theory, where the sheet material was assumed to obey Hill's anisotropic yield criterion and its associated flow rule.