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首页> 外文期刊>Journal of Materials Engineering and Performance >Uniaxial Tensile and Simple Shear Behavior of Resistance Spot-Welded Dual-Phase Steel Joints
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Uniaxial Tensile and Simple Shear Behavior of Resistance Spot-Welded Dual-Phase Steel Joints

机译：电阻点焊双相钢接头的单轴拉伸和简单剪切行为

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Small test coupons were machined from single spot welds in a dual-phase steel (DP600) to investigate deformation and failure of weld joints in both tension and shear. Quasi-static ( ε ～ 10{sup}(-4) l/s) testing was conducted in a miniature tensile stage with a custom image acquisition system. Strain accumulation in each weld was analyzed where fracture occurred, which was typically outside the fusion zone. A few shear test coupons that failed in the fusion zone were found to have the same spheroidal defects noted in previous work, and thus, severely limited weld strength and ductility. A novel strain mapping method based upon digital image correlation was employed to generate two-dimensional deformation maps, from which local stress-strain curves to failure were computed. As an important first step toward incorporation of material models into weld simulations, a preliminary finite element analysis of a tension test successfully reproduced the experimental results with material models for the base, heat-affected, and fusion zone materials generated from prior work.
机译：在双相钢（DP600）中从单点焊缝中加工出小试件，以研究焊缝在拉伸和剪切状态下的变形和破坏。使用定制的图像采集系统在微型拉伸阶段进行了准静态（ε〜10 {sup}（-4）l / s）测试。分析了每个焊缝中应变累积的位置，该位置通常发生在熔合区之外的断裂处。发现一些在熔合区失败的剪切试件具有先前工作中提到的相同的球形缺陷，因此严重限制了焊接强度和延展性。提出了一种基于数字图像相关性的应变映射方法，生成了二维变形图，计算出了变形至破坏的局部应力-应变曲线。作为将材料模型整合到焊接模拟中的重要的第一步，对张力测试进行的初步有限元分析成功地利用了先前工作产生的基础，热影响和熔合区材料的材料模型，再现了实验结果。

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