A Review of Recent Advances in Temperature-Dependent Constitutive Models and Ductile Fracture Models for Advanced High-Strength Steels in Automotive Applications

Abstract

Lightweight design is a global trend in the automotive industry. The extensive application of advanced high-strength steel in automobiles enables lightweight design, while its higher tensile strength ensures the safety of vehicle passengers. However, advanced high-strength steel suffers from defects such as edge cracking and spring-back during cold forming, which hinders its extensive application in automotive manufacturing. Thus, numerous researchers have incorporated temperature control into the forming process of advanced high-strength steels and found that this approach effectively enhances their formability without compromising tensile strength. Investigating temperature-dependent constitutive models and ductile fracture criteria for advanced high-strength steels can facilitate better understanding of their deformation behavior and more accurate cracking prediction, thus broadening their application prospects. Currently, temperature-dependent constitutive models and ductile fracture criteria for advanced high-strength steels are primarily categorized into two types: macroscopic and microscopic approaches. The macroscopic approach involves performing uniaxial tensile and other basic mechanical tests or constructing constitutive models that describe the stress-strain response through combining piecewise function fitting with continuum mechanics. On the microscopic scale, research primarily involves observing dislocation density, lattice distortion, grain orientation, etc., and constructing constitutive models that reveal deformation mechanisms and structural evolution laws by integrating dislocation dynamics and phase transition theory. Taking advanced high-strength steels as the research object, this paper reviews the current state of temperature-dependent constitutive models and analyzes three typical ductile fracture criteria.