| 短周期谱载荷作用下的疲劳裂纹扩展估算 |
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| 引用本文： | 李玉民. 短周期谱载荷作用下的疲劳裂纹扩展估算[J]. 航空学报, 1991, 12(4): 171-174 |
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| 作者姓名： | 李玉民 |
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| 作者单位： | 沈阳飞机研究所 |
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| 摘 要： | 本文公式系由线性累积损伤寿命公式乘以一个考虑超载迟滞效应的修正系数而构成的。 1.公式推导 Walker裂纹扩展方程为 da/dN=c(ZK_(max))~n (1)式中c,n,q及u为材料常数;R为应力比。 应力强度因子可以表示成式中,σ_(max)为垂直于裂纹的外加毛应力;Y为构型系数,它与裂纹长度有关。 当考虑超载迟滞效应时,Wheeler模型可以表示为
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| 关 键 词： | 载荷间相互影响 迟滞指数 塑性区尺寸 |
THE PREDICTION OF FATIGUE CRACK GROWTH UNDER SHORT PERIOD SPECTRUM LOADIND |
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| Shengyang Aircraft Research Institute Li Yumin. THE PREDICTION OF FATIGUE CRACK GROWTH UNDER SHORT PERIOD SPECTRUM LOADIND[J]. Acta Aeronautica et Astronautica Sinica, 1991, 12(4): 171-174 |
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| Authors: | Shengyang Aircraft Research Institute Li Yumin |
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| Affiliation: | Shengyang Aircraft Research Institute Li Yumin |
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| Abstract: | A semilinear formula in consideration of overload retardation effect is derived from Wheeler's retardation model for the-prediction of fatigue crack growth under short period flight-by-flight or block spectrum loading. As long as the spectrum size is small enough,the result calculated by this formula will closely agree with one of Wheeler's cycle-by-cycle integration. |
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| Keywords: | load-interaction retardation exponent plastic zone size. |
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