The following files were used in this problem:
fit_chaboche_strain.dat -- Input file to fit the model to stabilized hysteresis strain-controlled experimental data and simulate a uniaxial, strain-controlled experiment.
fit_chaboche_stress.dat -- Input file to fit the model to a cycle of stress-controlled experimental data and simulate a uniaxial, stress-controlled experiment.
fit_chaboche_combined.dat -- Input file to fit the model to stabilized hysteresis strain-controlled experimental data, and to fit the model to a cycle of stress-controlled experimental data and simulate a uniaxial, stress-controlled experiment.