Modified Johnson-Cook constitutive model of metallic materials under a wide range of temperatures and strain rates

• DOI: 10.1016/j.rinp.2021.104498
• Publication Date: 2021-06-29T08:28:59Z
• Authors: Yuntian Wang; Xiangguo Zeng; Huayan Chen; Xin Yang; Fang Wang; Lingxi Zeng
• Keywords: Latin Hypercube Sampling; Strain (injury); Atmospheric temperature range

This study concentrated on presenting the classical Johnson-Cook model by introducing a new temperature term, under framework of an equivalence between heat energy and distortional strain energy. Importantly, inner relationship among temperature, elastic modulus, specific capacity at constant pressure, Poisson's ratio was established quantitatively. What nicest character this term had that there were no fitting parameters, which made be applicable when lower than reference temperature. Thus, improved could effectively predict mechanical behavior over wide range rates temperatures. Using sets experimental data with varying temperatures rates, multi-objective approach combined Latin hypercube sampling method, Spearman rank correlation analysis, advanced genetic algorithm, applied for constitutive parameter identification optimization. Consequently, stress-strain responses several metallic materials various complex conditions reproduced proposed model. It shown good agreement prediction experiment results, even though