Mixed Mode Constitutive Driver

The mixed-mode constitutive driver is a software package that is dedicated to the efficient development, evaluation, and parameter identification (fitting) of material models used in finite element codes. The core driver calculates the stress-strain behavior of material models driven by combinations of strain increments and stress boundary conditions. Graphical user interfaces facilitate selection of the material model constants and desired load histories, and plot model output in two (stress-strain curves compared with test data) and three (yield surfaces) dimensions. Optimization routines fit the material models to test data. Optimization is accomplished by interfacing the driver with the LS-OPT code. The driver complements the performance of finite element codes. Its intended use is to help analysts efficiently fit and evaluate material models, with consistent results, prior to performing large-scale finite element analyses.