Investigation of Crack Turning in Fracture in Ship Structures.

摘要

The ability to predict crack propagation in a ship structure by finite element analysis based on linear elastic fracture mechanics was investigated. The investigation showed that he stress intensity factor at the crack tip, the number of cycles of constant amplitude loading o reach the critical intensity factor, and the critical length of the crack could be accurately predicted. The investigation concentrated on the ability to predict crack turning during propagation. Cracks originating at a plate edge, at a hole, and in the centre of a plate were evaluated. The results showed that crack turning was most likely to occur under mixed mode oading combining shear and tension.