三层板压印接头力学性能分析

发布时间：2018-09-08 13:22

【摘要】：本文的研究目的是分析三层板不同搭接方式的压印接头的力学性能,主要采用试验方法对其进行研究,具体方法如下:首先对1.5 mm AA5052+1.5 mm SPCC+1.5 mm AA5052三层板不同配置方式下的压印接头进行静态力学性能测试,分析三层板压印接头的静态失效模式及其静强度;再对静态力学性能最优组进行动态疲劳性能测试,分析疲劳失效模式及其疲劳强度,并采用最小二乘法拟合获得接头力-寿命(F-N)方程.试验结果表明:静态失效为上板颈部断裂、中板内锁拉脱和混合失效三种模式;T-A型接头静强度最低,T-C型接头静强度最高.其中,T-C型接头疲劳失效模式为上板颈部先断裂,之后下板出现裂纹导致接头失效;T-C型接头上板颈部疲劳性能较差,当应力水平为静强度40%时,疲劳循环最多只能达到15 965次,但是中板与下板连接可达到200万次.
[Abstract]:The purpose of this paper is to analyze the mechanical properties of embossing joints with different laminates, and to study them by means of test method. The specific methods are as follows: firstly, static mechanical properties of embossing joints with different configurations of 1.5 mm AA5052 1.5 mm SPCC 1.5 mm AA5052 three layers are tested, and the static failure modes and static strength of the three layer embossing joints are analyzed. The fatigue failure mode and fatigue strength of the optimal group of static mechanical properties were tested and the fatigue failure mode and fatigue strength were analyzed. The F-N equation was obtained by least square fitting. The test results show that the static failure is the neck fracture of the upper plate, the static strength of T-A joint is the lowest and the static strength of T-C joint is the highest. The fatigue failure mode of T-C joint is that the upper plate neck first breaks, and then the crack in the lower plate leads to the joint failure. When the stress level is 40 and static strength is 40, the fatigue cycle can only reach 15 965 times at most. But the medium plate and the lower board can be connected 2 million times.
【作者单位】：昆明理工大学机电工程学院;
【基金】：国家自然基金(50965009) 昆明理工大学分析测试基金(20140974)
【分类号】：TG115.5

【参考文献】