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该文以螺栓紧固铝板为研究对象,在已有实验研究的基础上应用有限元方法对疲劳载荷作用下铝板上表面接触区内边缘环向正应力和外边缘切向切应力的应力幅值和平均值的分布进行定性分析。在建模过程中,接触面采用直接约束模型,摩擦力的模拟选用粘接-滑动摩擦模型,在模拟螺母施加紧固力时,采用分步载荷法。根据数值计算结果,得到不同螺栓紧固力、摩擦系数、疲劳载荷与铝板紧固件接触区内边缘、外边缘疲劳裂纹萌生位置的关系,为下一步的实验研究提供必要的参考数据。
Based on the existing experimental research, the stress amplitude of ring-shaped normal stress and edge tangential shear stress in the contact area of the aluminum plate under the action of fatigue load is studied using the finite element method. And the average distribution of the qualitative analysis. In the modeling process, the contact surface adopts the direct constraint model, and the friction force simulation adopts the adhesion-sliding friction model. When the fastening force is applied by the simulation nut, the step load method is adopted. According to the numerical results, the relationship between the different bolt tightening force, friction coefficient, fatigue load and the location of the edge and outer edge fatigue crack initiation in the contact area of the aluminum plate fastener is obtained, which will provide the necessary reference data for the next experimental research.