Development and Calibration of a Super Large Scale Gap Test (SLSGT).
Final rept. May 92-Jun 96,
WRIGHT LAB EGLIN AFB FL
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Numerical simulations of eight inch 203 mm diameter gap test experiments employing heavily confined donors have been conducted. They reveal that strong convergence of lateral rarefaction waves results in transmitted shocks with latent high pressure regions which exceed the amplitude of the leading edge of the shock wave, and are transmitted into the gap attenuator. Since gap tests are calibrated using TOA measurement of the transmitted shock wave, into the attenuating material, the complex wave structure may lead to erroneous gap pressure assignments in the eight inch gap test. These simulations further indicate that this complex shock wave structure is attributable to the heavy steel case confinement, as donors without it exhibit minimal perturbations from lateral rarefaction. This results in a transmitted shock which is characterized by a smooth time decay profile. Therefore a new eight inch gap test using uncased Comp-B donors was developed, calibrated, and evaluated. TNT and AFX-1100 were used as baseline standard acceptors. The test is designated the Super Large Scale Gap Test SLSGT. Results indicate that the sensitivity of TNT to shock initiation is somewhat greater than previously observed.
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