锻压技术

自然时效对5A06铝合金自冲铆接接头性能的影响

英文标题：Influence of natural aging on properties of self-piercing riveting joint for 5A06 aluminum alloy

作者：雷军乐1 刘高宇 1 2 赵伦2 雷乐2 叶凯2 卢杰豪2 李承旺2 张亚平2 宋振东2 鲍丹阳2

分类号：TH131.1

出版年,卷(期):页码：2024,49(4):125-130

摘要：

为了研究自然时效对自冲铆接接头的影响，采用5A06铝合金进行自冲铆接，通过拉伸试验，从宏观层面研究自然时效对于5A06铝合金自冲铆接接头性能的影响，从微观层面分析了接头拉脱失效的形式和机理。结果表明：经过一年的自然时效，接头特有的机械内锁结构由于其应力的释放，畸变程度降低，接头的平均峰值载荷下降了15.28%、平均失效位移上升了58.37%、平均能量吸收提升了55.92%。接头不同应力集中处的应力释放不均匀，上、下板应力的集中释放速率不一致，导致两组试验主要失效的部位不同。在经过一年自然时效处理后，接头失效点处的韧窝分布更加密集，形状更大且更深，接头的脆性降低，塑性增加。

In order to study the influence of natural aging on self-plercing rievting joint, the self-piercing rievting was conducted with 5A06 aluminum alloy. From the macroscopic level, the influences of natural aging on the properties of 5A06 aluminum alloy self-piercing riveting joint were studied by tensile experiment, and from the microscopic level, the mode and mechanism of pull-out failure for joint were analyzed. The results show that after one year of natural aging, the distortion degree of joint with the special mechanical interlock structure reduces due to the release of its stress. The average peak load of joint decreases by 15.28%, the average failure displacement increases by 58.37%, and the average energy absorption increases by 55.92%. The stress release at different stress concentration positions of joint are not uniform, the stress concentration release rates of the upper and lower sheets are different, which leads to different failure locations in the two groups of experiments. After one year of natural aging treatment, the distribution of dimples at the failure point of joint is denser, the shape is larger and deeper, the brittleness of joint decreases, and the plasticity increases.

基金项目：

国家自然科学基金资助项目（12104324）；高层次人才科研启动项目（6022310046K，6024330003K）；深职大-新栋力超声波焊接技术研发中心项目（602331009PQ）；深圳职业技术大学博士后出站后期资助项目(6023271014K1);广东省普通高校特色创新项目(504-6020210006T);深圳市优秀科技创新人才培养项目(RCBS20210706092213010)；广西自然科学基金资助项目（2022GXNSFAA035528）

作者简介：雷军乐(1982-)，女，博士，教授 E-mail：40911409@qq.com 通信作者：赵伦(1988-)，男，博士，特聘副研究员 E-mail：zhaolun@szpu.edu.cn

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