A modified engineering critical assessment method for deeply-embedded cracks in metallic pipelines subjected to large plastic strain

作者：Jia, Pengyu; Jing, Hongyang; Xu, Lianyong^*; Han, Yongdian; Zhao, Lei

来源：Engineering Fracture Mechanics, 2019, 208: 171-188.

DOI：10.1016/j.engfracmech.2017.11.024

• Offshore pipeline
• Deeply-embedded crack
• Surface crack
• The factor F
• Crack tip constraint

The results of three-dimensional finite element analyses indicate that the normalized J-integral values of surface cracks are almost 3 times higher than those of deeply-embedded cracks, provided the sizes of the surface and deeply-embedded cracks are the same. In this paper, we introduce a factor F, which serves as an adjustment factor to reduce the degree of conservatism. The results show that F is the function of the non-dimensional deeply-embedded crack height (2a(e)/t), since F is markedly affected by 2a(e)/t. Furthermore, after introducing the factor F, the crack tip constraint of the deeply-embedded cracks is found to be lower than that of the surface cracks, which gives a further conservatism in using the factor F for assessment of embedded cracks.

• 出版日期2019-3-1
• 单位天津大学