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考虑金属热处理相变动力学模型,建立了适用于高强度钢板热成形的热、力、相变多场耦合本构方程。基于大变形动力显式有限元算法及上述多场耦合本构方程,建立了热成形动力显式有限元方程。并将板料相变潜热释放引入到热成形温度场分析过程中。在自主开发的商业化金属成形CAE软件KMAS(King Mesh Analysis System)基础上开发了热成形动力显式分析模块,可用于预测热成形过程中零件的厚度变化、温度变化、微观组织各相的体积分数以及硬度分布。随后采用该模块对一款汽车B柱的热成形过程及最终力学性能进行数值模拟预测,并与试验结果进行对比,对比的一致性证明了所建立的多场耦合本构方程及KMAS热成形动力显式分析模块的正确性。
Considering the phase change kinetic model of metal heat treatment, a coupled multi-field constitutive equation of heat, force and phase transition for thermoforming of high strength steel was established. Based on the large deformation dynamic explicit finite element method and the multi-field coupling constitutive equation, a thermodynamic explicit finite element equation was established. The latent heat release from sheet phase transformation is introduced into the thermoforming temperature field analysis. Based on the independently developed King Mesh Analysis System (KMAS) software for commercial metal forming, a thermodynamic explicit analysis module has been developed, which can be used to predict the thickness variation, temperature change and the volume of each phase of the microstructure during thermoforming Score and hardness distribution. Then the module was used to predict the thermoforming process and the final mechanical properties of a car B-pillar. Compared with the experimental results, the comparison proved that the multi-field coupling constitutive equation and KMAS thermoforming Explicitly analyze the correctness of the module.