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Fatigue life prediction of 2524‐T3 and 7075‐T62 thin‐sheet aluminium alloy with an initial impact dent under block spectrum loading
Fatigue & Fracture of Engineering Materials & Structures ( IF 3.7 ) Pub Date : 2021-01-10 , DOI: 10.1111/ffe.13416
D. Chen 1 , Z.Q. Cheng 1 , P.R. Cunningham 2 , J.J. Xiong 1
Affiliation  

This paper presents a fatigue life prediction model of post‐impacted sheets considering the effects of dent size and stress ratio. Low‐velocity impact tests at four different impact energies were performed on specimens cut from sheets of 2524‐T3 and 7075‐T62 aluminium alloy. Following the impact tests, static tensile and uni‐axial constant amplitude and block spectrum fatigue experiments were conducted. Numerical models were generated to determine the initial residual stress patterns, residual stress relaxation, and stress concentration factors around the impact dent. The SN curves and corresponding stress concentration factors and relaxed residual stresses of three of the post‐impacted specimens were used to determine the model parameters. Good agreement was achieved between the predictions and experimental results, and it has been demonstrated that the fatigue life prediction model can effectively simulate the effects of residual stress, stress concentration, and stress ratio on fatigue damage for post‐impacted thin sheet aluminium alloy materials.

中文翻译:

2524-T3和7075-T62薄铝合金的疲劳寿命预测

考虑到凹痕尺寸和应力比的影响,本文提出了一种冲击后薄板的疲劳寿命预测模型。在从2524-T3和7075-T62铝合金薄板上切下的样品上,以四种不同的冲击能量进行了低速冲击测试。进行冲击试验后,进行了静态拉伸和单轴恒定振幅以及块频谱疲劳实验。生成数值模型以确定冲击凹痕周围的初始残余应力模式,残余应力松弛和应力集中系数。在小号- ñ使用三个后冲击试样的曲线和相应的应力集中系数以及松弛的残余应力来确定模型参数。预测和实验结果之间取得了良好的一致性,并且已经证明,疲劳寿命预测模型可以有效地模拟残余应力,应力集中和应力比对后碰撞薄铝合金材料疲劳损伤的影响。
更新日期:2021-03-03
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