Purpose

The purpose of this paper is to obtain a more accurate fatigue life of structures by introducing the surface roughness into fatigue life prediction model.

Design/methodology/approach

Based on the fatigue life prediction model with surface roughness correction, the shock absorber cylinder is taken as an example to verify the feasibility of the improved method. Based on the load of the shock absorber cylinder during driving, fatigue experiments are performed under longitudinal and lateral forces, respectively. Then, the fatigue life predicted by the modified model is compared with that predicted by the traditional model.

Findings

By comparing with the test results, considering the influence of mean stress, the Manson method is more accurate in life prediction. Then, the modified Manson-Coffin and Manson method with surface roughness is more accurate in life prediction under longitudinal force and lateral forces, respectively. This verifies the feasibility of the improved method with the surface roughness.

Originality/value

The research on the influence of surface roughness on fatigue life can lay the technical foundation for the life prediction of products and have great significance to the quality evaluation of products.

中文翻译：

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带表面粗糙度修正的减振器气缸疲劳寿命预测改进模型

目的

本文的目的是通过将表面粗糙度引入疲劳寿命预测模型，以获得更准确的结构疲劳寿命。

设计/方法/方法

基于带表面粗糙度修正的疲劳寿命预测模型，以减振器气缸为例，验证改进方法的可行性。根据行驶过程中减振器缸体的载荷，分别在纵向和横向力作用下进行疲劳试验。然后，将修正模型预测的疲劳寿命与传统模型预测的疲劳寿命进行比较。

发现

通过与试验结果对比，考虑平均应力的影响，曼森法寿命预测更准确。然后，改进的 Manson-Coffin 和带有表面粗糙度的 Manson 方法分别在纵向力和横向力下的寿命预测更准确。这用表面粗糙度验证了改进方法的可行性。

原创性/价值

研究表面粗糙度对疲劳寿命的影响，可为产品寿命预测奠定技术基础，对产品质量评价具有重要意义。