屈服准则对差厚铝合金拼焊板拉深成形数值模拟的影响

The Effect of Different Yield Criteria on the Finite Element Simulation of Deep Drawing Formability for Different Thickness Tailor Welded Blanks

分别采用Mises、Hill二次和Barlat三参数屈服准则对差厚铝合金拼焊板拉深成形方盒件进行有限元模拟,比较了不同屈服准则和不同压边力下零件的成形特点和应变分布,焊缝的移动规律和焊缝附近金属变形情况。结果表明不同屈服准则对成形趋势预测一致,法兰面上焊缝向拼焊板的薄侧流动,而在型腔部位焊缝向厚侧移动;不同压边力对差厚板的成形质量影响较大,对焊缝移动影响较小。不同准则预测结果仍有明显差异,Mises准则下对成形性能预测最危险,而焊缝附近薄侧板料的减薄率Mises准则模拟结果最为理想。

Square cup deep drawing of different thickness tailor welded blanks was simulated respectively by using different yield criteria(Mises,Hill quadratic,Barlat three-parameter).The forming characteristic,strain distributing and weld-line movement were compared under different holder forces.The results show that the different yield criteria provide same trend in formability.In flange region the weld-line moves to thin part,while in straight wall the weld-line moves to thick part.Different holder forces influence the forming quality more than those influence the weld-line movement.Under Mises yield criterion the formability is danger,but the thickness reduction of thin blank beside the weld-line is perfect.