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一、前言疲劳裂纹扩展速率(da/dN)不仅是表征材质抗疲劳断裂性能的重要指标,而且是损伤容限设计必不可少的基本参数。本文是按线弹性断裂力学理论,主要讨论恒幅疲劳裂纹扩展速率在10~(-2)～10~5mm/cycle 范围内所受应力比 R 的影响。我们在完成的《航空金属材
I. INTRODUCTION The fatigue crack growth rate (da / dN) is not only an important index to characterize the fatigue fracture resistance of materials, but also an indispensable basic parameter for damage tolerance design. According to the theory of linear elastic fracture mechanics, this paper mainly discusses the influence of the stress ratio R under the range of 10 ~ (-2) ~ 10 ~ 5mm / cycle of constant amplitude fatigue crack growth rate. We are in the process of completing "aviation metal material