6061-T4铝合金搅拌摩擦焊T型接头拉伸断裂实验研究

发布时间：2018-03-16 10:31

本文选题：搅拌摩擦焊　切入点：-T铝合金　出处：《天津大学学报(自然科学与工程技术版)》2015年08期 　论文类型：期刊论文

【摘要】：针对6061-T4铝合金搅拌摩擦焊T型接头力学性能开展了实验研究,首先通过显微观测分析了T型接头的缺陷特征,随后进行了沿蒙皮板方向和沿支撑板方向的宏观拉伸实验,利用数字图像相关(DIC)方法研究了接头的拉伸断裂行为.实验结果表明,焊接接头中均存在弱连接缺陷,且弱连接缺陷是导致接头沿筋板断裂的主要原因.沿蒙皮板方向拉伸时,接头的强度受焊接参数的影响不大,且其断裂主要是由热影响区(HAZ)材料软化且两侧材料强度差异较大所引起;沿支撑板方向拉伸时,试件首先在弱连接缺陷处萌生裂纹,裂纹在载荷作用下沿弱连接所在的方向扩展,并在试件另一侧靠近筋板处产生明显的应力集中区域,最终试件发生剪切断裂失效.此外,接头沿筋板方向抗拉强度随焊接转速的增加有增大趋势.
[Abstract]:According to the 6061-T4 Aluminum Alloy friction stir welding joint of T type mechanical properties experimental study has been carried out, first through microscopic observation analysis of defect characteristics of T type joints, followed by skin plate along the direction and along the direction of the support plate tensile experiments using digital image correlation (DIC) method to study the tensile fracture behavior of joint experiments. The results show that the welding defects are weakly connected joints, and weak bonding defects is caused mainly due to joint along the reinforcement plate fracture. Along the direction of tensile plates, the joint strength is not affected by the welding parameters, and the fracture is mainly caused by the heat affected zone (HAZ) and the difference between both sides of material softening material of greater strength along the direction of the cause; the support plate tension specimen, first in the weak link at the defect of crack initiation, crack under load along the weak link in the direction of expansion, and in the other side of the specimen near the stiffened plate The area of stress concentration is obvious, and the shear failure of the final specimen occurs. In addition, the tensile strength of the joint along the direction of the stiffener increases with the increase of welding speed.

【作者单位】：天津大学机械工程学院;中国民航大学中欧航空工程师学院;北京遥感设备研究所;天津大学天津市现代连接技术重点实验室;
【基金】：中央高校基本科研业务费资助项目(20001921)
【分类号】：TG453.9

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