Three—Dimensional Elastic-Plastic FEM Analysis on Torsion of Square-Section Bars

Summary This paper deals with FEM analysis on the torsion of solid bars. Using EM program MARC, three—dimensional elastic—plastic torsion problem, which have not to date been solved, were analysed. Thus, the longitudinal strain during twisting is calculated for the first time. The decreasing ratio of axial length becomes smaller with the increase of strain -hardening ratio. Furthermore, the decreasing ratio of axial length of the square—section bar was larger than that of the circular—section bar. The same tendency has been observed in previous experiments.