单搭自冲铆接头的动力学分析与疲劳研究

发布时间：2018-06-29 04:34

本文选题：自冲铆 + 仿真模拟　；参考：《昆明理工大学》2011年硕士论文

【摘要】：自冲铆技术是用于板料连接的一种新的工艺,过程简单,一步完成,具有点焊所没有的优势,被誉为下一代连接技术,是汽车轻量化过程中的一项关键的技术。本文主要研究了单搭自冲铆接头的动力学性能、疲劳性能和仿真模拟,包括单搭自冲铆接头的模态分析,自冲铆接过程模拟,拉伸过程中的裂纹扩展模拟和静态拉伸试验的研究。模拟结果与试验吻合,为以后进一步研究打下基础,提供了理论依据,与此同时降低试验成本,节省了大量的人力和物力,具有一定的参考价值。对单搭自冲铆接头的动力学性能研究,主要是对自冲铆接头进行了模态分析。模态分析涉及到的模型分为两种情况,一种是含有裂纹,一种是不含有裂纹。同时又对每种情况在不同参数下分别进行了研究,参数具体包括密度、弹性模量、泊松比和裂纹长度。通过ANSYS/FE-SAFE软件研究了自冲铆接接头的疲劳性能,包括疲劳寿命和最小安全系数,并模拟出S-N曲线。另外,还研究了载荷幅值、表面加工系数、载荷频率因素对疲劳性能的影响。通过LS-DYNA软件对自冲铆接过程进行了模拟,其结果和试验结果吻合。通过铆接过程模拟来研究铆接过程、能量的变化、内部应力云图和内部压力云图等。同时研究了密度、弹性模量、屈服强度、摩擦系数和搭接材料等因素对铆接过程的影响。通过LS-DYNA软件对拉伸过程中的裂纹扩展进行了动态仿真模拟,本文研究了铆钉、上板、下板的受力状况和变形情况,同时也能得到应力分布云图、力-时间曲线、内部压力云图、能量变化和裂纹扩展速率曲线。最后研究了静态拉伸试验,研究了自冲铆接接头的抗拉强。在拉伸试验中,铆钉从下板中被拉出或者下板断裂。
[Abstract]:Self-punching riveting technology is a new technology used in sheet metal connection. The process is simple, one step is completed, and it has the advantage of spot welding. It is praised as the next generation connection technology, and it is a key technology in the process of automobile lightweight. This paper mainly studies the dynamic performance, fatigue performance and simulation of single-lap self-impact riveting head, including modal analysis of single-lap self-punching riveting head and simulation of self-punching riveting process. The study of crack propagation simulation and static tensile test during tensile process. The simulation results are in agreement with the experiment, which lays a foundation for further research and provides a theoretical basis for further research. At the same time, the cost of the experiment is reduced, and a lot of manpower and material resources are saved, which has certain reference value. The dynamic performance of single lap self-impact riveting head is studied, and the modal analysis of self-impact riveting head is carried out. The model involved in modal analysis is divided into two cases, one is with crack, the other is without crack. At the same time, each case is studied under different parameters, including density, elastic modulus, Poisson's ratio and crack length. The fatigue properties of self-punching riveted joints were studied by ANSYS / FE-SAFE software, including fatigue life and minimum safety factor, and S-N curves were simulated. In addition, the effects of load amplitude, surface processing coefficient and load frequency on fatigue properties are also studied. The self-punching riveting process was simulated by LS-DYNA software, and the results were in good agreement with the test results. The riveting process, energy change, internal stress cloud diagram and internal pressure cloud diagram are studied by riveting process simulation. The effects of density, modulus of elasticity, yield strength, friction coefficient and lap material on the riveting process were also studied. The dynamic simulation of crack growth in tensile process is carried out by LS-DYNA software. The stress and deformation of rivets, upper plates and lower plates are studied in this paper. At the same time, the stress distribution cloud diagram, the stress-time curve and the internal pressure cloud diagram are obtained. Energy variation and crack growth rate curve. Finally, the static tensile test and the tensile strength of the self-punching riveted joint are studied. In tensile tests, rivets are pulled out of the lower plate or broken.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH131.1

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