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首页> 外文期刊>Engineering Fracture Mechanics >Modeling crack growth of an aircraft engine high pressure compressor blade under combined HCF and LCF loading
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Modeling crack growth of an aircraft engine high pressure compressor blade under combined HCF and LCF loading

机译:HCF和LCF负载下的飞机发动机高压压缩机刀片建模裂纹增长

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摘要

This paper presents a 3D crack growth simulation of an aircraft engine high pressure compressor blade which fractured in service. Using FRANC3D, an initial crack is inserted and grown using the max tensile stress theory. A numerical method was developed to capture the stress field under low cycle fatigue (LCF) and high cycle fatigue (HCF) loading by superimposing test measured dynamic loading with steady stresses. In doing so, the predicted crack trajectory, aspect ratio, and shape more closely agreed with the fractured airfoils compared to performing the simulation under LCF loads alone. This supports findings from fractographic investigation that the crack exhibits HCF rather than LCF characteristics.
机译:本文介绍了一架飞机发动机高压压缩机叶片的3D裂纹增长模拟,该模拟在服务中破裂。 使用Franc3D,使用最大拉伸应力理论插入并生长初始裂缝。 开发了一种数值方法,通过叠加试验测量的动态负载,捕获低循环疲劳(LCF)和高循环疲劳(HCF)负荷的高循环疲劳(HCF)负载。 在这样做,与单独的LCF负载下的模拟相比,预测裂缝轨迹,纵横比和形状更加紧密地同意。 这支持来自Fretography Spection的结果,即裂缝表现出HCF而不是LCF特征。

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