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摘要
In order to study the crack formation mechanism of an aluminized polymer-bonded explosive (PBX) under tensile stress, a Brazilian test was carried out on the aluminized PBX grains with different densities. In addition, the microscopic morphologies of the samples after the Brazilian test were characterized. The experimental results show that the process of crack formation includes initiation, propagation, and final formation; the cracks are generated by the accumulation of microscopic defects and they expand gradually from the interior to the end surface of grains. With increasing grain density, as well as the curing process, the critical stress values could be significantly improved during the formation of cracks. The formationmechanism of the cracks is not transcrystalline fracturebut interfacial debonding, which was observed using scanning electron microscopy.
- 出版日期2017
- 单位西安近代化学研究所
