Approximate stress intensity factors for a semi-circular crack in an arbitrary structure under arbitrary mode I loading

作者：Kaklar Javad Alizadeh; Googarchin Hamed Saeidi^*

来源：Theoretical and Applied Fracture Mechanics, 2018, 94: 71-83.

DOI：10.1016/j.tafmec.2018.01.007

• Semi-circular crack
• Stress intensity factor
• Weight function method
• Finite thickness plate
• Thick-walled cylinder

Approximate Stress Intensity Factors (SIFs) for a semi-circular surface crack in arbitrary elastic finite and infinite bodies are presented. Utilizing General Point Load Weight Function (GPLWF) concept, an explicit expression is derived to determine SIFs for semi-circular cracks subjected to uniform, linear, and nonlinear loads. The presented formulation not only provides a solution for cracked bodies subjected to arbitrary two-dimensional stress distribution on the crack faces, but also could present SIFs for any point on the crack front. The results of the presented formulation for special cases, i.e. semi-circular cracks in a finite thickness plate subjected to complicated loadings, central and non-central semi-circular cracks in finite-length thick-walled cylinders subjected to a uniform internal pressure, and central semi-circular cracks in an infinite-length thick-walled cylinder subjected to a non-uniform internal pressure are compared with the available results in the literature and those obtained through FEM, indicating a very good accuracy. The proposed procedure will be generalized for semi elliptical cracks in arbitrary structures and mixed mode loading in future.

• 出版日期2018-4