The Cracks Formation Mechanism of an Aluminized Polymer-Bonded Explosive under Tensile Stress
The Cracks Formation Mechanism of an Aluminized Polymer-Bonded Explosive under Tensile Stress
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DOI：
10.1080/07370652.2016.1222465
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发表时间：
2017-04
影响因子：
2.1
通讯作者：
J. Tao;Xiaofeng Wang;Sheng-Sheng Zhao-Sheng
中科院分区：
文献类型：
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作者：
J. Tao;Xiaofeng Wang;Sheng-Sheng Zhao-Sheng
摘要为了研究含铝高聚物粘结炸药（PBX）在拉伸应力作用下的裂纹形成机理，对不同密度的含铝PBX药柱进行了巴西试验。此外，巴西测试后的样品的微观形貌进行了表征。实验结果表明：裂纹的形成过程包括萌生、扩展和最终形成;裂纹是由微观缺陷累积而成，并从晶粒内部向端面逐渐扩展。随着颗粒密度的增加以及固化工艺的改善，裂纹形成过程中的临界应力值会显著提高。用扫描电镜观察到裂纹的形成机制不是穿晶断裂而是界面脱粘。
ABSTRACT 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 formation mechanism of the cracks is not transcrystalline fracture but interfacial debonding, which was observed using scanning electron microscopy.