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首页> 外文期刊>Journal of Materials Processing Technology >Effect of stamping dimensional deviations on residual stresses and deformation of resistance spot welded steel sheets
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Effect of stamping dimensional deviations on residual stresses and deformation of resistance spot welded steel sheets

机译：冲压尺寸偏差对电阻点焊钢板残余应力和变形的影响

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摘要

Direct finite element analysis that takes stamping dimensional deviations into account was achieved based on coupled electro-thermo-mechanical method and reverse engineering in the current research. The two continuous resistance spot welding processes of the reverse established back side panel were simulated. Its residual stresses and deformation were compared with those of the ideal back side panel. Large distortion presents in the reverse back side panel while only slight deformation exists in the ideal one. The former is validated to be closer to the deformation of the actual welded back side panel. The peak residual stresses after processes 1 and 2 remain almost unchanged in the reverse back side panel while those in the ideal one show an increasing trend. The final residual stresses of the reverse and the ideal back side panel are both high but the former is lower than the later. The stamping dimensional deviations are responsible for these differences. They lead to obvious attenuation of geometric features and large assembly clearances in the reverse back side panel. These assembly clearances allow large deformations of the stamping parts during the welding process. Meanwhile, these clearances make it relatively freer for the heated sheet metal to expand thermally in the thickness direction, resulting in less or even no residual stress in this direction. These clearances also promote the release of the thickness-direction component of the tensile residual stress in the extension direction of sheet by allowing deformation in the thickness direction.
机译：基于当前研究中的耦合电热机械方法和逆向工程，实现了采用冲压尺寸偏差的直接有限元分析。模拟了反向建立的后侧板的两个连续电阻点焊过程。将其残余应力和变形与理想后侧面板的剩余应力和变形进行比较。在反向侧板中具有大的扭曲，同时仅在理想的略微变形中存在。前者被验证更接近实际焊接背面面板的变形。流程1和2后的峰的残余应力保持在反向后侧片几乎不变，而那些在理想一个显示增加的趋势。反向和理想后侧板的最终残余应力都很高，但前者低于后来。冲压尺寸偏差对这些差异负责。它们导致在反向侧板中的几何特征和大装配间隙明显衰减。这些装配间隙允许在焊接过程中进行冲压部件的大变形。同时，这些间隙使得加热的金属金属在厚度方向上热膨胀，使其相对呈现在厚度方向上的热量，导致在该方向上较少或甚至没有残余应力。这些间隙还通过允许在厚度方向上变形来促进伸缩性方向沿延伸方向的拉伸残余应力的厚度方向分量的释放。

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