用于断裂可靠性设计的P-Km-da/dN-ΔK曲面

The P K m da/dN ΔK Surface Used for Design on Fracture Reliability

本文提出了疲劳裂纹扩展Ｋｍ－ｄａ／ｄＮ－ΔＫ曲面，并给出了Ｐ－Ｋｍ－ｄａ／ｄＮ－ΔＫ曲面实验数据处理及参数估计公式；利用该曲面可进行断裂损伤折算及随机载荷谱作用下构件裂纹扩展寿命估算。最后给出了一实例。

To describe the behavior of fatigue crack growth in materials, a P K m da/dN ΔK surface is proposed, and formulas for estimating the parameters in it based on testing data are presented. The surface can be used for the prediction of crack growth life under a random loading spectrum and for structure damage estimation. An application example is given.