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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >EXPERIMENTAL AND NUMERICAL PREDICTION OF SURFACE CRACK GROWTH IN FATIGUE IN A FINITE WIDTH PLATE
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EXPERIMENTAL AND NUMERICAL PREDICTION OF SURFACE CRACK GROWTH IN FATIGUE IN A FINITE WIDTH PLATE

机译：有限宽板疲劳表面裂纹扩展的实验和数值预测

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摘要

In the thick components such as gas turbine disks, the cracks usually manifest in the form of part-through or embedded elliptical cracks. The shape of surface crack varies during the crack propagation and significantly affects the fatigue life predictions of the surface cracked components. In present work, crack propagation of semi-elliptical cracks in a finite width specimen of a gas turbine material subjected to fatigue load has been studied experimentally and numerically. The numerical simulation was accomplished by first extending the applicability of available stress intensity factor empirical equation for semi-elliptical cracks to finite width solid. Using this empirical equation for stress intensity factor, the effect of change in the crack shape on the crack propagation life is simulated by numerical models. Also, in order to include the effect of crack closure in the numerical prediction of growth of surface cracks, a ratio of crack closure factor between depth and surface locations of a semi-elliptical crack was obtained by experiments. The experimental observations were used in correlating the numerical predictions for crack shape progression and crack propagation life.
机译：在诸如燃气轮机盘之类的较厚的部件中，裂纹通常表现为部分贯通或嵌入的椭圆形裂纹的形式。表面裂纹的形状在裂纹扩展过程中会发生变化，并且会严重影响表面裂纹组件的疲劳寿命预测。在目前的工作中，已经通过实验和数值研究了半椭圆形裂纹在燃气轮机材料有限宽度试样中的疲劳扩展。数值模拟是通过首先将可用的应力强度因子经验公式对半椭圆形裂纹的适用性扩展到有限宽度实体来完成的。使用该应力强度因子的经验公式，通过数值模型模拟了裂纹形状变化对裂纹扩展寿命的影响。另外，为了在表面裂纹扩展的数值预测中包括裂纹闭合的影响，通过实验获得了半椭圆形裂纹的深度和表面位置之间的裂纹闭合因子的比率。实验观察结果用于关联裂纹形状发展和裂纹扩展寿命的数值预测。

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