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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of the Peak Tensile Overload Cycles on the Fatigue Crack Growth of Aluminum Alloy Under Spectrum Loading
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Influence of the Peak Tensile Overload Cycles on the Fatigue Crack Growth of Aluminum Alloy Under Spectrum Loading

机译：频谱载荷下峰值拉伸过载循环对铝合金疲劳裂纹扩展的影响

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摘要

Many structures such as aircrafts, risers, and offshore pipelines that are in contact with fluids, become subjected to complex variable amplitude loading (VAL) stress-time histories during their service lives. As a result, the structural life assessment and damage-tolerant analyses of such structures are considered as two important design criteria. In this paper, a VAL stress-time history is used to study the fatigue life of 6061-T651 aluminum alloy, with focus on the retardation effect resulting from the applied peak tensile overload cycles (TOLCs). Various so-called "clipping" levels are tested, and the results are compared with those obtained through an analytical method, using the Willenborg retardation approach, in conjunction with the Walker fatigue crack growth model. The results would demonstrate the significant influence of the TOLC present within VAL scenarios on retarding the fatigue crack growth rate of the material. The study also investigates the influence of various clipping levels on the fatigue response of the material, also highlighting the limitations of the analytical approach in estimating the resulting crack growth rate. It is observed that the analytical method predicts a higher fatigue life for the material subjected to VAL, which is non-conservative for design purposes. Some suggestions are provided for fatigue life estimation of the material when subjected to VAL scenarios.
机译：与流体接触的许多结构（例如飞机，立管和海上管线）在使用寿命期间会经受复杂的可变振幅载荷（VAL）应力-时间历史记录。结果，这种结构的结构寿命评估和抗损伤分析被认为是两个重要的设计标准。在本文中，使用VAL应力-时间历史记录来研究6061-T651铝合金的疲劳寿命，重点是施加峰值拉伸过载循环（TOLC）产生的延迟效应。测试了各种所谓的“剪切”水平，并将结果与​​使用Willenborg延迟方法结合沃克疲劳裂纹扩展模型通过分析方法获得的结果进行了比较。结果将证明VAL场景中存在的TOLC对延迟材料的疲劳裂纹扩展速率具有重大影响。这项研究还研究了各种剪切水平对材料疲劳响应的影响，还强调了分析方法在估计最终裂纹扩展率方面的局限性。可以看出，该分析方法预测了经受VAL的材料的疲劳寿命，这对于设计而言是非保守的。提供了一些建议，用于评估在VAL情况下材料的疲劳寿命。

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