异种厚度搭接的铝合金自冲铆接头力学性能研究

发布时间：2018-08-08 13:05

【摘要】：在汽车工业里,汽车整车重量直接影响汽车的燃油消耗和尾气排放。随着汽车轻量化设计的发展,铝合金、镁合金、纤维增强塑性材料等轻质材料得到了广泛的应用,传统的连接方法很难实现这些材料的有效连接,作为一种独特的连接技术-自冲铆连接(SPR)可以实现这些材料的连接。本文以异种厚度搭接的5052铝合金单搭自冲铆接头为研究对象,基于试验与模拟研究了其拉伸与疲劳性能,并对比分析了板厚对其力学性能的影响,完成了一定的研究工作,得到了一定的研究成果。本文主要工作可分为以下几个方面：1.异种厚度铝合金板的自冲铆连接研究对异种厚度的铝合金薄板进行了自冲铆连接工艺的研究,获得了1.5mm+2.5mm组合搭接的5052铝合金自冲铆接头(AB接头)的最优铆接工艺；对此接头进行了自冲铆连接工艺的有限元模拟,结果表明试验与模拟具有良好的一致性。2.基于试验与模拟的接头静力学性能研究对制备好的AB接头进行准静态力学性能测试,获得了接头的载荷-位移曲线及静态失效过程和模式；对不同板厚搭接的同种材料接头进行了对比研究,结果表明随着板厚增加,接头静强度增大；对AB接头进行了其静拉伸试验的有限元模拟,结果表明AB接头具有与试验一致的静态失效模式。3.基于试验与模拟的接头疲劳性能研究对制备好的AB接头进行疲劳试验,获得了接头的S-N曲线及疲劳失效过程和模式；对不要板厚搭接的同种材料接头进行了对比研究,结果表明随着板厚增加,接头疲劳强度增大；对AB接头进行了其疲劳试验的有限元模拟,结果表明AB接头在高载荷水平下的模拟结果与实际结果一致,在低载荷水平下的模拟结果应进行进一步的改进和研究。
[Abstract]:In automobile industry, vehicle weight directly affects fuel consumption and exhaust emission. With the development of automobile lightweight design, lightweight materials such as aluminum alloy, magnesium alloy, fiber reinforced plastic material and so on have been widely used. As a unique connection technology-self-punching riveting (SPR) can achieve the bonding of these materials. In this paper, the tensile and fatigue properties of 5052 aluminum alloy single lap self-impact riveting head with different thickness are studied based on test and simulation, and the effect of plate thickness on its mechanical properties is compared and analyzed. Some research results have been obtained. The main work of this paper can be divided into the following aspects: 1. Study on Self-impact riveting connection of Aluminum Alloy Plate with different thickness the optimum riveting process of 5052 aluminum alloy self-impact riveting head (AB joint) with 1.5mm 2.5mm combination is obtained. The finite element simulation of the joint is carried out. The results show that the test and simulation are in good agreement with each other. The quasi-static mechanical properties of AB joints were tested based on the test and simulation results, and the load-displacement curves, static failure processes and modes of the joints were obtained. The results show that the static strength of the joint increases with the thickness of the plate, and the static tensile test of AB joint is simulated by finite element method. The results show that AB joint has the same static failure mode as the test. 3. Based on the experimental and simulated fatigue properties of AB joint, the S-N curve and fatigue failure process and mode of joint were obtained, and the joint of the same material without thick plate was studied. The results show that the fatigue strength of the joint increases with the increase of plate thickness, and the finite element simulation of the fatigue test of AB joint is carried out. The results show that the simulation results of AB joint under high load level are consistent with the actual results. The simulation results at low load level should be further improved and studied.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG306

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