Design and Purchase Expectations for Fracture Resistance of 7000-Series Aluminum Airframe Alloys.
Interim rept. Oct 72-Sep 73,
BATTELLE COLUMBUS LABS OHIO
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When an airframe component breaks suddenly, under conditions well within the design envelope, the occurrence is usually termed brittle fracture. This report uses an analytical scheme which combines data from several different sources in order to provide diagrams of fracture resistance versus thickness for a number of standard yield strength levels. By using such diagrams, limited data on a new alloy or heat treatment may be compared, and the impact on designs where fracture resistance is important may be assessed. The data background employed in the analysis consisted of both iron- and aluminum-base airframe materials. However, this report focuses largely on the 7000-series aluminum alloys. Minimum expected behavior has been developed for this series of aluminum alloys by examining fracture toughness, yield strength, and thickness effect in accordance with the analytical scheme described.
- Metallurgy and Metallography