A Study of Near-Tip Local Parameters for Stable Crack Growth with a 3D FE-Analysis

A 3D-FEM simulation of a fracture mechanics test is presented where the crack extension, Δa, is controlled by local Δa vs. load line displacement curves measured on different locations along the crack front. These data originate from an extensive multi-specimen J IC- test. The results of the 3D-analysis fit excellently to the experimental data and to the results of a modified two-layer model used in preceding studies. The current 3D-analysis supports the assumption that (after a short transition region) the local crack tip opening angle remains constant during growth.