ON THE APPLICATION OF LS-OPT TO IDENTIFY NON-LINEAR MATERIAL MODELS IN LS-DYNA

A response surface optimization algorithm for structural material or parameter identification is evaluated. The algorithm used is the Successive Response Surface Method (SRSM) available in LS-OPT. To illustrate the robustness of SRSM as a material identification tool, two test cases are presented. The first concerns the identification of the power-law material parameters of a simple tensile test specimen. The second test case involves the identification of a model to characterize the brittle damage in a composite laminated structure. It is shown that SRSM is an effective tool for material parameter identification involving strongly nonlinear materials.