拼焊板单向拉伸变形非均匀性

从金属塑性理论出发,结合拼焊板成形特点,推导出同材差厚拼焊板试件单向拉伸情况下缩颈时焊缝两侧薄厚板变形量公式。并基于垂直于拉伸方向居中焊缝的拼焊板单向拉伸实验,将实验结果与公式推导结果比较,初步验证了公式的合理性。进而进行了不同焊缝位置(焊缝垂直于拉伸方向,薄厚板厚度比例不同)情况下的拼焊板试件单向拉伸有限元模拟,进一步验证了所推导公式是正确的。另外,分析了单向拉伸状态下焊缝两侧薄厚板变形的非均匀特性,利用文章所提出的公式,可以定量地预测单向拉伸状态下拼焊板试件焊缝两侧材料非均匀性变形量,从而为提高焊缝两侧材料的匹配性以减小拼焊板变形的非均匀性提供了参考依据。

Research on non-uniform deformation of tailor-welded blanks in uniaxial tension

Based on the metallic plastic theory and associated with the TWB formability characteristic,the equations for the uniaxial tensile TWB specimen with the same material and different thickness are deduced to calculate the value of deformation of the base metal materials when necking.A uniaxial tensile test involving TWB specimens with the transverse weld orientation (which represents a weld normal to the loading direction) and the center weld location (which represents that the weld zone was located at the geometric centre of the specimen) was carried out and a uniaxial tensile numerical simulation involving TWB specimens with the transverse weld orientation and the offset weld location was performed.The results of numerical simulation and experiment accord with that of the equations.Meanwhile,the non-uniform deformation characteristic of the base metal materials welded was investigated.The equations presented in this paper can predict the value of deformation for the both parts of TWB specimens in quantity,which contributes to the optimization of material combination of the blanks welded.