有限元分析在含锰金属蒙皮铆接结构疲劳断裂性能中的研究

A Research on Fatigue Fracture Performance of Manganese Containing Metal Skin Riveted Structures Using Finite Element Analysis

随着计算机网络技术的迅速发展,有限元分析技术被广泛应用于铆接技术当中,在机械连接结构设计中起到了重要作用。为提高有限元分析法在求解含锰金属蒙皮铆接结构中断裂参数的精度,在有限元分析法中引入插值函数,推导出有限元分析模型,并对模型进行仿真验证。结果显示,受应力作用在x方向和y方向上分别产生0.02 mm和0.006 mm的位移,应力主要集中在铆钉与蒙皮的连接处,孔周会产生先下陷再上翘的内翘情况。上下壁板可承受最大应力SVM1和SVM2分别增加了63 MPa和61 MPa,在受到外加荷载的情况下裂纹会先出现在下壁板与铆钉结构的连接处。综合应力随着裂纹长度的增大而减小,起始应力值271 MPa为铆钉材料拉伸强度的83.4%,铆接结构疲劳断裂的扩展应力较小、铆钉材料综合起始应力较大。以上结果显示,基于有限元分析在含锰金属蒙皮铆接结构疲劳断裂性能中的研究,对铆接结构断裂研究领域具有一定的参考意义。

With the rapid development of computer network technology,finite element analysis technology has been widely applied in riveting connection technology,playing an important role in the design of mechanical connection structures.To improve the accuracy of finite element analysis in solving fracture parameters of manganese containingin metal skin riveted structures,interpolation functions are introduced into the finite element analysis method.A finite element analysis model is derived and verified through simulation.The simulation results show that under stress,displacement of 0.02 mm and 0.006 mm are generated in the x and y directions,respectively.The stress is mainly concentrated at the connection between the rivet and the skin,and the hole circumference of the riveted structure will experience an internal warping situation of first sinking and then rising.The maximum stresses that the upper and lower wall panels can withstand the stress of SVM1 and SVM2.It has increased by 63 MPa and 61 MPa,respectively.Under external loads,cracks will first appear at the connection between the lower wall panel and the rivet structure.The comprehensive stress decreases with the increase of crack length,and the initial stress value of 271 MPa is 83.4%of the tensile strength of the rivet material.The fatigue fracture propagation stress of the riveted structure is relatively small and the comprehensive initial stress of the rivet material is relatively large.The above results indicate that the study of finite element analysis in the fatigue fracture performance of metal skin riveted structures has certain reference value in the field of metal skin riveted structure fracture research.