Abstract
The fatigue life prediction model of self-piecing riveting components of aluminum alloy is established and the effects of roughness and residual stress on fatigue life of self-piercing riveting components is analyzed by the model. Finite element software ABAQUS and fatigue analysis software FE-SAFE are used to study the effects of roughness and residual stress on the fatigue life of self-piecing riveting components through finite element simulation and mathematical statistics multivariate orthogonal regression experiment. The quantitative relations between fatigue life and three variables (roughness, residual stress and maximum stress) are fitted, and the variation trend of fatigue life with roughness and residual stress is obtained. The order of influence of roughness, residual stress, maximum stress and two interactions on fatigue life is as follows: residual stress, interaction between roughness and residual stress, roughness. When the maximum stress is fixed, the fatigue life decreases with the increase of roughness with a certain residual stress, and the fatigue life decreases with the increase of roughness with a certain residual stress. The average error between the fatigue experiment results and the simulation results is 9.74%, which proves that the simulation results are reliable.
Highlights
The lightweight development of G-Series high-speed railway has become an inevitable trend, among which aluminum alloy plays a more and more important part in the body materials of rail vehicles due to its low density, high specific strength and good wear resistance [1,2,3]
Xing Baoying et al [11,12] studied the influence of multiple rivet distributions on the mechanical properties and failure mechanism of joints, and thoroughly studied the macro and micro failure mechanisms of joints based on experiments
Deng Chengjiang et al [13] studied the dynamic fatigue characteristics of self-piercing riveting allogeneic joints, and the results showed that the fatigue failure modes of aluminum alloy allogeneic joints were plate fracture
Summary
The lightweight development of G-Series high-speed railway has become an inevitable trend, among which aluminum alloy plays a more and more important part in the body materials of rail vehicles due to its low density, high specific strength and good wear resistance [1,2,3]. Aluminum alloy; Self-piecing riveting; Surface roughness; Residual stress; Fatigue life; FE-SAFE.
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