Abstract
Elastic-plastic finite element analyses using the Mises and Tresca yield conditions have become quite well-known since their introduction several years ago. Constant strain triangular (CST) elements have generally been utilized in these solutions. A 6-node linear strain triangular (LST) element with the capability of modeling partial plasticity is presented in this paper. A plane stress tensile specimen with a 90 degree notch subjected to a monotonically increasing load is solved by both the CST and LST element models within the inelastic range. It is shown that although the growth of plastic regions predicted by LST elements is smoother and more accurate when compared with those due to CST elements, there is a penalty to be paid in terms of the needed computer time. Consequently, unless very accurate strain and stress distributions are required in a specific problem, the use of CST elements in elastic-plastic analyses should be preferred.
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