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 dynamic strain distributions exhibited notable differences in that the strain singularity in the static case was close to r(-0.75) while in the transient case it shifted towards r(-0.5). At high crack velocities and larger crack length to crack width ratios, strain singularity approached r(-0.5). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1966
- Accession Number
- AD0804949
Entities
People
- Albert S. Kobayashi
- W. L. Engstrom
Organizations
- University of Washington