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中文摘要：
门内板是激光拼焊板在汽车车身上应用的典型零件之一。推导了单向拉伸下差厚拼焊板的应力、应变与厚度关系的公式；通过数值模拟和实冲试验，研究0．8mm×1．2mm和0．8mm×1．5mm两种不同厚度组合对拼焊板应力、应变、厚度和焊缝移动量等成形性能的影响。模拟和试验的结果与推导的公式吻合：随着板厚比增大，薄侧板材承受的应力、应变变大，破裂的危险也相应增加，而厚侧板材的应力、应变随板厚比的增大而减小。
英文摘要：
Door inner is one of the most typical parts in the applications of tailor--welded blanks in automobile bodies. Calculating formula with different thickness ratio of tailor welded blanks was deduced in order to find out the changes of stresses and strains when thickness ratio was different. Numerical simulations and experiments were employed in tailor--welded blanks stamping with thickness combination of 0. 8mm × 1.2mm and 0.8mm × 1. 5mm to investigate the influences on the formability including the distribution of stress, strain and thickness and the movement of welding line. The results of numerical simulation and experiment accord with the formulation. When thickness ratio increases, the stress and strain in thin blank will increase and the chance of fracture increases too. On the contrary, the stress and strain in thick blank will de crease when thickness ratio increases.
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