The research on FE simulation of forming and dent resistance is carried out to improve the simulation accuracy of dent resistance for automobile sheet.First,the HC180BD+Z sheets were formed into samples with two different strain by using a die,and then the samples were loaded at a speed of 10 mm/min by a hemispherical steel indenter to obtain the initial stiffness and the buckling effect load.Then,forming and dent resistance simulation was carried out by Ls-dyna,and the simulation error of initial stiffness and buckling effect load was less than 10％without considering the effect of forming.By using a thickness and strain mapping approach,the simulation error of initial stiffness and buckling effect load was less than 5％.Finally,the effects of thickness and strain mapping on the initial stiffness and buckling effect load results were compared and analyzed.The research shows that the initial stiffness is related to the material thickness,while the buckling effect load is related to the material thickness and yield strength.The simulation accuracy of dent resistance can be effectively improved by using thickness and strain mapping approach.The buckling effect load result is overestimated by the isotropic hardening model,and the simulation accuracy of buckling effect load can be further improved by a combination of isotropic and kinematic hardening model.
关键词
成形性能/抗凹性能/数值模拟/厚度和应变映射/应变硬化
Key words
forming properties/dent resistance properties/numerical simulation/mapping of thickness and strain/strain hardening
维普
万方数据