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Abstract:
Existing dynamic data are reviewed and new data are reported for spall type fracture in several metals. Fracture in OFHC copper was observed to be time dependent. Over driven spall in 1020 steel is better described by a time-independent spall stress of -45 kbar, and plastic strain of 0.03. However, experiments with conical targets indicated that this model is not entirely adequate for non 1-D strain states. Spall failure is 4340 RC30 steel did not appear to be rate dependent. The spall stress was -55 kbar. Spall in armor plate occurred at -60 kbar. In nickel 200, void coalescence was very gradual. Spall plate separation was virtually impossible in 1100 aluminum. The threshold stress for void formation was about -7 kbar.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Final rept. Feb 79-Dec 80 |
| Pages: |
128 |
| Report Date: |
JUN 1981 |
| Contract Number: |
F33615-76-C-5124 |
| Report Number: |
A544211 |
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