Development of a Testing Technique for the Yield Strength Determination of 5 Inch Steel Cartridge Cases
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The standard Navy method for determining the yield strength of 5 inch steel cartridge cases is shown to overestimate the actual circumferential yield strength of the case by about 40 percent. An expanding ring testing apparatus was developed to measure the actual yield strength. Comparison of this strength with the yield strength measured at different stages of the standard flat tensile sample preparation method revealed that the major cause for the difference is the stress relieving treatment given to the flattened tensile specimens. The increase in the strength during the stress relieving is believed to be due to the precipitation of epsilon carbide and the resulting precipitation hardening.
- Test Facilities, Equipment and Methods
- Ammunition and Explosives