A simplified calibration method for Chaboche model based on monotonic loading curves

Abstract

The Chaboche mixed isotropic/kinematic hardening model has garnered widespread applications due to its efficacy in characterizing the stress–strain behavior of materials subjected to multi-axial cyclic loading. However, the calibration of the Chaboche model material parameters poses significant challenges, necessitating at least one cyclic loading test to procure experimental data. This process can be both time-consuming and economically burdensome. To address these challenges, this paper proposes an efficient and accurate calibration method based on monotonic loading curves, applicable to existing alloys exhibiting hysteretic curves similar to monotonic loading curves. This method employs reduction coefficients to derive stable hysteresis characteristics from monotonic loading data directly and extract the Chaboche model parameters. Validation through cyclic three-point bending tests confirms that this method simplifies the calibration process while maintaining high accuracy.