关键词: 等价一缺陷, 裂纹初始, 裂纹扩展

Abstract: improved method for determining the parameters of equivalent initial flaw size(EIFS)distribution is set up in this paper.The time to crack initiation(TTCI)values corre- sponding to gived reference crack size for every specimens in several stress level are obtained. These TTCI values are translatcd into EIFS values bv EIFS master equation. The all EIFS values composed a sample of EIFS population. Then EIFS distribution parameters(α,Qβ,Xu)are de- teimined by fitting above EIFS values based on EIFS distribution function。 Beacause increasing sample capacity,detennined EIFS distribution parameters is more accurate,and predicted dam- age degree ofthe structure is more reliable.

Key words: equivalence defects, crack initiation, crack propagation