TRANSIENT ANALYSIS IN FRACTURING ALUMINUM PLATE.
Abstract
Transient displacement distributions in centrally notched aluminum plates with propagating cracks were determined by using the Moire fringe technique. Specimens used were 7075-T6 and 7178-T6 aluminum alloy 4 inches wide, 1/16 inch thick with half crack lengths of 0.12 to 0.25 inches. The transient Moire patterns were recorded with a Beckman and Whitley Model 501A image converter camera. Crack velocities and crack accelerations were determined by utilizing crack wires. Crack velocities in 7178-T6 specimens were higher than those in 7075-T6 specimens. It was also found that the static and transient normal strain distributions in the region immediately ahead of the crack tip were similar. Also with increasing crack velocities, the order of strain singularity approached the order of r to the -0.5 power as found in a previous investigation (see AD-624 168). It was concluded that for this series of experiments, Craggs' model of a moving crack agreed with the experimental results. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1967
- Accession Number
- AD0653073
Entities
People
- Albert S. Kobayashi
- W. L. Engstrom
Organizations
- University of Washington