A numerically expedient scheme for elastic-plastic calculations in incremental finite element analysis

A numerically expedient scheme developed by Yang [1]for the modification of a Cholesky decomposed stiffness matrix is outlined. When used in conjunction with an incremental elastic-plastic finite element program, this method may result in a substantial reduction of computer time. The technique is appropriate for small strain problems, and optimal benefits are realized in situations involving contained plastic flow. The numerical efficiency of the technique is substantiated by case studies.