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首页> 外文期刊>Journal of Materials Engineering and Performance >A Fatigue-Life Prediction Methodology for Notched Aluminum-Magnesium Alloy in Gulf Seawater Environment
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A Fatigue-Life Prediction Methodology for Notched Aluminum-Magnesium Alloy in Gulf Seawater Environment

机译：海湾海水环境中缺口铝 - 镁合金的疲劳 - 寿命预测方法

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摘要

Local-strain and linear-elastic fracture-mechanics (LEFM) methodologies have been investigated for prediction of the corrosion-fatigue life of notched components of specially developed AI-2.5Mg alloys exposed to Arabian Gulf seawater environment. Corrosion-fatigue crack initiation life estimates were obtained using strain-life relationships; corrosion-fatigue crack propagation life estimates were obtained using LEFM relationships. The total corrosion-fatigue life was considered to be the sum of the crack initiation and crack propagation lives. Estimated corrosion-fatigue lives were compared with experimentally obtained corrosion-fatigue life data using center-notched specimens of three types of Al-2.5Mg alloys (containing different amounts of chromium) exposed to Arabian Gulf seawater environment. Two notch geometries, a circular notch (K_t = 2.42) and an elliptical notch (K_t = 4.2), were investigated. Good corrosion-fatigue life predictions can be obtained using local-strain and LEFM methodologies by determining the relevant material constants via a few simple fatigue tests on smooth specimens and a few crack-growth-rate tests in the environment at the frequency of interest.
机译：已经研究了局部应变和线性弹性骨折 - 力学（LEFM）方法，以预测特殊开发的AI-2.5MG合金暴露于阿拉伯海湾海水环境的缺口组分的腐蚀疲劳寿命。使用应变 - 寿命关系获得腐蚀 - 疲劳裂纹启动寿命估计;使用偏出关系获得腐蚀 - 疲劳裂缝繁殖寿命估计。总腐蚀寿命被认为是裂纹启动和裂缝繁殖的总和。将估计的腐蚀疲劳寿命与使用三种类型的Al-2.5mg合金（含有不同量的铬）暴露于阿拉伯海湾海水环境的腐蚀 - 疲劳寿命数据。研究了两个凹口几何形状，圆形凹口（K_T = 2.42）和椭圆形缺口（K_T = 4.2）。通过在兴趣频率的环境中通过少量简单的疲劳试验确定相关材料常数，可以使用局部应变和甲烯方法来获得良好的腐蚀疲劳预测。

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