航空学报 > 1995, Vol. 16 Issue (2): 55-60

疲劳裂纹扩展参数研究

倪惠玲, 傅祥炯   

  1. 西北工业大学结构强度研究所, 西安, 710071
  • 收稿日期:1994-06-28 修回日期:1994-09-26 出版日期:1995-04-25 发布日期:1995-04-25

A PARAMETER STUDY OF FATIGUE CRACK PROPAGATION

Ni Huiling, Fu Xiangjiong   

  1. Northwestern Polytechnical University,Xi'an,710072
  • Received:1994-06-28 Revised:1994-09-26 Online:1995-04-25 Published:1995-04-25

摘要: 在大量拉-压超载实验的基础上导出考虑拉-压超载中压缩载荷影响的参数———超载截止比γSR的计算式,并提出简单超载截止比γSO的实验测定方法。将参数γSR用于裂纹扩展寿命预测模型,获得良好的效果。

关键词: 拉-压超载, 超载比, 裂纹扩展

Abstract: Based on plenty of tensile-compressive overload test,a formula of overload shut-off ratio γ SR ,the parameter which takes account of reducing overload retardation effect by compressive load,is proposed.For delermining the value of overload shut-off ratio γ SO of single overload,a test method is suggested here as well.It is shown that the prediction of crack propagation life with the parameter γ SR involved in is well correlated with the test results of random load spectra.

Key words: tensile- compressive overload, overload rat io, crack propagation

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