BERYLLIUM CRACK PROPAGATION AND EFFECTS OF SURFACE CONDITION. Period covered July 1, 1958-December 31, 1959
Technical Report
·
OSTI ID:4108087
The effect of various surface finishes (as-received, ground, etched, etched and scratched, ground and shotpeened, and milled) on the properties of rolled beryllium sheet was investigated. Static tensile tests were conducted at- 65 to l200 gas-cooled F; and notch sensitivity, bend ductility. fatigue, and impact tests over a range of temperatures were made. Best properties were obtained on a sheet that had been etched to remove surface defects by machining. Ductility was low in all cases but was increased by heating at 400 to 600 gas- cooled F. The fatigue endurance limit was as high as the static tensile strength, and it was improved by etching. Impact tests were found to be most suitable for distinguishing between various surfaces. Theoretical analyses were made of the effect of including residual stress in the Griffith crack theory and of the dynamic stress at the leading edge of a crack in a uniaxially stressed plate. (C.J.G.)
- Research Organization:
- Lockheed Aircraft Corp. Missiles and Space Div., Sunnyvale, Calif.
- NSA Number:
- NSA-15-004303
- OSTI ID:
- 4108087
- Report Number(s):
- WADD-TR-60-116
- Country of Publication:
- United States
- Language:
- English
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