本文選題：自沖鉚 + 仿真模擬　； 參考：《昆明理工大學》2011年碩士論文

【摘要】：自沖鉚技術(shù)是用于板料連接的一種新的工藝,過程簡單,一步完成,具有點焊所沒有的優(yōu)勢,被譽為下一代連接技術(shù),是汽車輕量化過程中的一項關鍵的技術(shù)。 本文主要研究了單搭自沖鉚接頭的動力學性能、疲勞性能和仿真模擬,包括單搭自沖鉚接頭的模態(tài)分析,自沖鉚接過程模擬,拉伸過程中的裂紋擴展模擬和靜態(tài)拉伸試驗的研究。模擬結(jié)果與試驗吻合,為以后進一步研究打下基礎,提供了理論依據(jù),與此同時降低試驗成本,節(jié)省了大量的人力和物力,具有一定的參考價值。 對單搭自沖鉚接頭的動力學性能研究,主要是對自沖鉚接頭進行了模態(tài)分析。模態(tài)分析涉及到的模型分為兩種情況,一種是含有裂紋,一種是不含有裂紋。同時又對每種情況在不同參數(shù)下分別進行了研究,參數(shù)具體包括密度、彈性模量、泊松比和裂紋長度。 通過ANSYS/FE-SAFE軟件研究了自沖鉚接接頭的疲勞性能,包括疲勞壽命和最小安全系數(shù),并模擬出S-N曲線。另外,還研究了載荷幅值、表面加工系數(shù)、載荷頻率因素對疲勞性能的影響。 通過LS-DYNA軟件對自沖鉚接過程進行了模擬,其結(jié)果和試驗結(jié)果吻合。通過鉚接過程模擬來研究鉚接過程、能量的變化、內(nèi)部應力云圖和內(nèi)部壓力云圖等。同時研究了密度、彈性模量、屈服強度、摩擦系數(shù)和搭接材料等因素對鉚接過程的影響。 通過LS-DYNA軟件對拉伸過程中的裂紋擴展進行了動態(tài)仿真模擬,本文研究了鉚釘、上板、下板的受力狀況和變形情況,同時也能得到應力分布云圖、力-時間曲線、內(nèi)部壓力云圖、能量變化和裂紋擴展速率曲線。 最后研究了靜態(tài)拉伸試驗,研究了自沖鉚接接頭的抗拉強。在拉伸試驗中,鉚釘從下板中被拉出或者下板斷裂。
[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.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH131.1

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相關期刊論文 前1條

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本文編號：2080866