Published: Jan 1965
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Fracture tests for material and process specifications involving high-strength alloys are necessary to insure adequate inspection standards for material and hardware acceptance. Proper specimen design is necessary to produce useful toughness information, especially a specimen size adequate to avoid general yielding prior to fracture. Evidence of significant toughness variation in commercial alloys is presented. The paper illustrates the use of present analytical expressions to determine inspection standards for isolated defects of various geometry and for linear arrays of multiple defects. Specific rejection criteria for multiple defects are suggested.
Metallurgist, Air Force Rocket Propulsion Laboratory, Edwards, Calif.