基于疲勞的鋁合金板件無鉚釘鉚接接頭布置規(guī)律研究
[Abstract]:Rivetless riveting technology is widely used in automobile body assembly connection. The stress concentration of the connecting parts makes it become the fatigue failure part of the whole structure, so the fatigue resistance of riveted structural parts plays an important role in the safety of automobile use. Because the rivetless riveting point position is usually the fatigue failure position of the structure, the rational arrangement of riveting point position can not only prolong the service life of the automobile structure, but also save the material, which plays an active role in the automobile lightweight. The main research goal of this paper is to analyze the fatigue life of two rivet-free riveting points, the shear structure and the peeling structure. The effects of different distance between riveting points and the size of upper and lower plate of riveting structure on the fatigue performance of shear structure and peeling structure are obtained, and the location of riveting points is obtained. In view of this research goal, this paper mainly carries out the research from the following several aspects: (1) through various kinds of rivetless riveted joint structural parts test, The maximum load-bearing tensile force and fatigue life of shearing and peeling structures are obtained. (2) static and fatigue parameters of shearing and peeling structures are obtained by finite element simulation and compared with experimental parameters. The validity of the established model is verified. (3) through the verified finite element model, the fatigue characteristics of shearing and peeling parts with different riveting points and different lap sizes are simulated and predicted. Thus, the arrangement of riveted joints without rivets in shearing structure and peeling structure is obtained. In this paper, the quasi static tensile test of Al5052 material is carried out, and the yield and strength limits of the material are obtained. At the same time, quasi static tensile tests of shear structure and peeling structure were carried out, and the maximum tensile load of the two structures was obtained. The fatigue load of shear structure during fatigue test is determined according to the experimental data. By establishing the finite element simulation model and comparing the simulated quasi-static tensile results with the experimental results, the validity of the proposed shear and peeling structure models is verified. At the same time, the fatigue life of some shear structural parts is predicted by simulation, and compared with the experimental structure, it is concluded that the predicted life of simulation is generally shorter than that of test. Considering the influence of dispersion in fatigue test, the life error is within one order of magnitude. The life distribution of shear parts with different spacings and lap sizes is consistent with the experimental results. The validity of the proposed finite element model is further verified from the fatigue point of view. Finally, the fatigue analysis of three kinds of shear structures with separated edge spacing and four kinds of lap sizes is carried out under single load condition, and the high and low single load spectrum fatigue analysis of three kinds of delamination structures and three kinds of delamination structures are carried out. The optimal service life of shearing and peeling structures is obtained by arranging two riveting points.
【學位授予單位】:吉林大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:U466
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