J-Integral and HRR Field Associated with Stable Crack Growth in Thin Aluminum SEN Specimen
Abstract
Moire interferometry with line densities of 1200 and 40 lines per mm was used to determine the two orthogonal displacements surrounding a stationary and a stably extending crack, respectively in two thin 2024-T3 aluminum alloy, single-edge notched specimens. The displacement fields were used to compute the J-integrals for various contours during crack tip blunting and subsequent crack extension. As expected, the near-and far-field J-integral value prior to stable crack growth coincided with the LEFM strain energy release rate, G, and validated the experimental procedure. The far field J values increased with increasing stable crack grow-Lh but the crack tip J values within the nonlinear region remained constant. The HRR displacement field, which was computed from the experimentally determined far field J, agreed with the measured displacement field prior to stable crack growth and progressively deviated from the measured values with stable crack extension.... Elastic-plastic fracture mechanics, Stable crack growth, J-integral, HRR field, J-Q theory, Moire interferometry, Experimental fracture mechanics.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1993
- Accession Number
- ADA267879
Entities
People
- Albert S. Kobayashi
- F. X. Wang
- G. B. May
Organizations
- University of Washington