Equivalent Linear Elastic Fracture Mechanics Research Articles

J-integral and HRR field associated with large crack extension

Geometric Moire with line density of 39.4 lines/mm (1000 lines/in.), was used to study the path independency of the J-integral and the adequacy of the HRR field displacement associated with large crack extensions up to 12mm in 2024-0 aluminum SEN specimens. The J-integral was not path independent after a small stable crack growth of about 1.5 mm in this specimen. The HRR u- and v-displacements were also computed by using either the near- or far-field J-integral values. Despite some scatter, the results showed that for a small stable crack growth, the measured u-displacement agreed better with the equivalent linear elastic fracture mechanics (LEFM) displacements while the measured v —displacement nearly coincided with the HRR v-displacement, which was obtained by using the near-field J-values.