Abstract
A pyrotechnic system consisting of donor/acceptor pair separated by a gap relies on shock attenuation characteristics of the gap material and shock sensitivity of the donor and the acceptor charges. Despite of its common use, a numerical study of such a pyrotechnic train configuration is seldom reported because proper modeling of the full process requires precise capturing of the shock wave attenuation in the gap prior to triggering a full detonation of a high explosive and accurate description of the high strain rate dynamics of the explosively loaded inert confinements. We apply a hybrid particle level-set based multimaterial hydrocode with reactive flow models for pentolite donor and heavily aluminized cyclotrimethylene-trinitramine as the acceptor charge. The complex shock interaction, a critical gap thickness, an acoustic impedance, and go/no-go characteristics of the pyrotechnic system are quantitatively investigated.
Highlights
Pyrotechnic mechanical devices often utilize gap test configuration between a donor and an acceptor for a reliable gas generation aiming at various “push-pull” actuations found in many industrial and military applications
A pyrotechnic system consisting of donor/acceptor pair separated by a gap relies on shock attenuation characteristics of the gap material and shock sensitivity of the donor and the acceptor charges
We apply a hybrid particle level-set based multimaterial hydrocode with reactive flow models for pentolite donor and heavily aluminized cyclotrimethylene-trinitramine as the acceptor charge
Summary
Pyrotechnic mechanical devices often utilize gap test configuration between a donor and an acceptor for a reliable gas generation aiming at various “push-pull” actuations found in many industrial and military applications. Operability of such pyrotechnic systems depends on mechanical properties of the gap and shock sensitivity of donoracceptor charges. A critical gap thickness of a gap whose shock characteristics are known a priori is measured when the acceptor charge is detonated at its initiating pressure. The test consists of four components: a donor charge, a gap, an acceptor charge, and a witness block. A critical gap thickness for which the acceptor has 50% probability of being detonated marks the shock sensitivity of the acceptor.
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