A comparison of triangle and quadrangle finite elements for large strain elastoplastic formulations

摘要: The paper presents a comparative study of different elastoplastic large strain formulations used in research groups Mendoza and Li` ege. comparison is focused on few academic standardized problems, particular necking cylindrical bar tension. Stress distribution at section, as well load histories are analyzed for all three formulations. Two other test cases consider bending the so-called ”Greco” beam upsetting cylinder. Numerical results show that approaches yield very similar thus equally valid. Furthermore, quadratic 6-noded triangles provide good alternative to bilinear quadrangles, even if sometimes they appear be more sensitive big distorsions.