Tension-Shear Properties and Fatigue Properties of Clinched Joints of Different Materials
摘 要
采用分体式下模压印连接设备分别对SPCC钢和5052铝合金进行压印连接, 然后对两种材料的压印接头进行拉剪试验, 并在不同载荷水平下进行疲劳试验, 研究了它们的拉剪性能和疲劳性能。结果表明: 在拉剪载荷下, 铝合金压印接头从上、下板接触挤压的颈部发生断裂, 钢压印接头在上、下板接触挤压的颈部发生断裂的同时发生剥离失效, 压印接头的拉剪强度主要与上板的颈部强度有关; 不同材料压印接头的疲劳性能均良好, 钢压印接头的宏观裂纹出现在接头的盲孔边缘, 垂直于载荷方向延伸, 断裂发生在板材的接头处, 其在0.75倍最大破坏载荷下的疲劳寿命超过500万次; 铝合金压印接头在每种载荷水平下的疲劳寿命均可达200万次。
Abstract
SPCC steels and 5052 aluminum alloy were respectively jointed by segmented die clinched joint equipment, and then the ension-shear tests for clinched joints of the two materials were conducted, and fatigue test at different load levels were performed. The results show that at the action of tension-shear load, the aluminun alloy clinched joint fractured at neck of joint, the steel clinched joint also fractured at neck of the joint and the upper sheet was separated from the lower sheet simultaneously. The tension-shear strength of joints was mainly determined by the strength of necks. The clinched joints of different materials had favorable fatigue properties. A visual fatigue crack was found at the edge of blind hole in the steel clinched joint, perpendicular to the loading direction, and the failure appearing at the region of joints. The fatigue life of steel clinched joints at 0.75Fs was over 5 million cycles and that of aluminum alloy clinched joint at ervery load levels was more than 2 million cycles.
中图分类号 TG3
所属栏目 材料性能及其应用
基金项目 国家自然科学基金资助项目(50965009); 昆明理工大学分析测试基金资助项目(2011489)
收稿日期 2012/12/12
修改稿日期 2013/8/15
网络出版日期
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备注郑俊超(1986-), 男, 湖北宜昌人, 硕士研究生。
引用该论文: ZHENG Jun-chao,HE Xiao-cong,XU Jing-nan,ZENG Kai,DING Yan-fang. Tension-Shear Properties and Fatigue Properties of Clinched Joints of Different Materials[J]. Materials for mechancial engineering, 2014, 38(1): 52~55
郑俊超,何晓聪,许竞楠,曾凯,丁燕芳. 不同材料压印接头的拉剪性能和疲劳性能[J]. 机械工程材料, 2014, 38(1): 52~55
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【2】MUCHA J. The analysis of lock forming mechanism in the clinching joint[J].Materials and Design,2011,32: 4943-4954.
【3】CARBONI M, BERETTA S, MONNO M. Fatigue behavior of tensile-shear loaded clinched joints[J].Engineering Fracture Mechanics,2006,73: 178-190.
【4】KIM H. Fatigue strength evaluation of the clinched lap joints of a cold rolled mild steel sheet[J].Journal of Materials Engineering and Performance,2013,22(1):1-6.
【5】李小亮.虚拟激励法下汽车行驶平顺性振动仿真分析[D].武汉: 武汉理工大学, 2011.
【6】XIII-1539-96/XV-845-96 Recommendations on fatigue design of welded joints and components[S].
【7】许海生, 杨新岐, 耿立艳, 等.铝合金焊接接头疲劳强度试验研究[J].机械强度, 2006,28(3): 442-447.
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