A fracture criterion for widespread cracking in thin-sheet aluminum alloysAn elastic-plastic finite-element analysis was used with a critical crack-tip-opening angle (CTOA) fracture criterion to model stable crack growth in thin-sheet 2024-T3 aluminum alloy panels with single and multiple-site damage (MSD) cracks. Comparisons were made between critical angles determined from the analyses and those measured with photographic methods. Calculated load against crack extension and load against crack-tip displacement on single crack specimens agreed well with test data even for large-scale plastic deformations. The analyses were also able to predict the stable tearing behavior of large lead cracks in the presence of stably tearing MSD cracks. Small MSD cracks significantly reduced the residual strength for large lead cracks.
Document ID
19930068903
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Newman, J. C., Jr. (NASA Langley Research Center Hampton, VA, United States)
Dawicke, D. S. (Analytical Services and Materials, Inc. Hampton, VA, United States)
Sutton, M. A. (South Carolina Univ. Columbia, United States)
Bigelow, C. A. (NASA Langley Research Center Hampton, VA, United States)