Tensile shear strength of laser lap joints
Tensile shear strength of laser lap joints
复制标题
激光搭接接头的拉伸剪切强度
DOI：
10.1080/09507116.2014.921078
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发表时间：
2015
影响因子：
--
通讯作者：
Y. Akiniwa
中科院分区：
文献类型：
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作者：
S. Furusako;Y. Miyazaki;Y. Akiniwa
本研究旨在建立一个能预测激光焊接搭接接头拉伸剪切强度和断裂部位的模型。为了明确焊缝长度和焊缝宽度对它们的影响，对使用厚度在0.8-1.2 mm范围内的钢板的接头进行了评估。结果发现，拉伸剪切强度随焊道尺寸的增加而增加，在拉伸试验中，断裂发生在母材（BM）、焊缝金属（WM）或它们之间具有弯曲热影响区（HAZ）的部分。此外，为了阐明在拉伸试验期间WM周围的旋转变形过程，观察接头的横截面，其在拉伸试验中被施加到几个载荷。这一观察结果导出了热影响区内平面处的半径Ri与板厚度中心处的旋转角之间的关系。此外，通过线性回归获得Ri与所施加的载荷之间的关系。基于这些函数和一些假设，对节点的变形进行了塑性分析。这些假设认为，接头由BM，WM和HAZ组成，它们处于简化的应力模式下。最后，估算了接头的拉剪强度和断裂部位。这一估算与实验结果吻合较好。
This study was aimed at establishment of a model that can predict tensile shear strength and fracture portion of laser-welded lap joints in the tensile test. To clear the influence of bead length and bead width on them, the joints that used steel sheets with a thickness in the range of 0.8–1.2 mm were evaluated. It was found that the tensile shear strength increases with the bead size, and the fracture occurs at base metal (BM), weld metal (WM) or a portion between them with a curvature heat-affected zone (HAZ), in the tensile test. Also to clarify the rotational deformation process around WM during the tensile test, cross-sections of joints were observed, which were applied to several loads in the tensile test. This observation derived the relationship between the radius, Ri, at the inner plane of the HAZ and the rotational angle at the centre of the sheet thickness. Furthermore, the relationship between Ri and the applied load was obtained by linear regression. A plastic analysis for deformation of the joints was carried out based on these functions and some assumptions. These assumptions consider that the joint consists of BM, WM and HAZ, which are under a simplified stress mode. Finally, estimation of the tensile shear strength and the fracture portion of the joints was achieved. This estimation made good accordance with the experimental results.