This paper aims to assess the effective strain damage (ESD) model with a durability analysis of an automobile coil spring under consideration of the load sequence effect. Conventional strain-life models such as Coffin-Manson, Morrow and Smith-Watson-Topper are insufficient in predicting fatigue life under the consideration of the load sequence effect. Strain time histories of coil springs were captured based on three types of road conditions: highway, campus and industrial roads. In order to determine the fatigue life, the ESD and conventional strain-life models were employed. The strain-life models predicted lower fatigue life values for campus and industrial roads, which contained many high amplitude events. Similar fatigue life predictions for ESD and conventional strain-life models were found on the highway due to the absence of high amplitude events, which led to a minimal load sequence effect. The suitability of the ESD model was verified through the Weibull probability plot, in which the ESD model fitted well to the distribution compared to conventional strain-life models. The main contribution is that load interactions have a significant influence on predicting fatigue life within the random strain histories of the fatigue properties of a coil spring.

中文翻译：

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考虑汽车螺旋弹簧载荷序列效应的疲劳寿命评估有效应变损伤模型的可接受性

本文旨在通过考虑载荷序列效应的汽车螺旋弹簧的耐久性分析来评估有效应变损伤（ESD）模型。传统的应变寿命模型如 Coffin-Manson、Morrow 和 Smith-Watson-Topper 不足以预测考虑载荷序列效应的疲劳寿命。根据三种类型的路况捕获螺旋弹簧的应变时间历史：高速公路、校园和工业道路。为了确定疲劳寿命，采用了 ESD 和传统的应变寿命模型。应变寿命模型预测校园和工业道路的疲劳寿命值较低，其中包含许多高振幅事件。由于不存在高振幅事件，导致负载序列效应最小，因此在高速公路上发现了类似的 ESD 疲劳寿命预测和传统应变寿命模型。通过威布尔概率图验证了 ESD 模型的适用性，其中与传统应变寿命模型相比，ESD 模型很好地拟合了分布。主要贡献在于，载荷相互作用对预测螺旋弹簧疲劳特性的随机应变历史中的疲劳寿命具有重大影响。