Mechanical behavior of a typical polymer bonded explosive under compressive loads
Mechanical behavior of a typical polymer bonded explosive under compressive loads
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压缩载荷下典型聚合物粘结炸药的力学行为
DOI：
10.1080/07370652.2021.1980151
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发表时间：
2020
影响因子：
2.1
通讯作者：
Sun Yi
中科院分区：
文献类型：
--
作者：
Xiao Youcai;Xiao Xiangdong;Xiong Yanyi;Fan Chenyang;Wang Zhijun;Sun Yi
通过实验和仿真研究了六氢- 1,3,5 -三硝基- 1,3,5 -s-三嗪（RDX）聚合物粘结炸药（PBXs）的压缩力学行为和损伤模式。采用准静态和动态单轴压缩试验研究了PBX-JH14C对应变速率的强度敏感性。采用被动围合试验测量了PBX-JH14C的轴向和径向应力历史曲线，研究了PBX-JH14C在动态多轴载荷作用下的行为特征。结果表明：PBX-JH14C的动态应力-应变曲线表现出明显的应变率效应；结合理论分析和细观分析，研究了PBX-JH14C在低速冲击下的损伤特性。采用proony级数表示的玻尔兹曼叠加原理，建立了PBX-JH14C动态力学响应的本构理论。松弛模量的数学表示可以通过拟合模量主曲线得到。通过有限元模拟与实验结果的对比，验证了模型的正确性。此外，还观察到理论预测与实验结果吻合。在实验和理论研究的基础上，探讨了PBX-JH14C的损伤模式和机理。在无约束条件下，界面脱粘和基体空化是低速冲击下的主要破坏机制。
The compressive mechanical behavior and damage mode of polymer bonded explosives (PBXs) based on hexahydro-1, 3, 5-trinitro-1, 3, 5-s-triazine (RDX) were systematically investigated via experiments and simulations. The strength sensitivity on strain rate of PBX–JH14C was studied using quasi-static and dynamic uniaxial compressive tests. The axial and radial stress history curves were measured using a passive confining experiment, and characterizations of the behavior of PBX–JH14C were studied under dynamic multi-axial loads. The results showed that the dynamic stress-strain curves of PBX–JH14C exhibited an evident strain rate effect. Combining theoretical and meso analyses, the damage characteristics of PBX–JH14C under low speed impacts were studied. A constitutive theory was developed for modeling the dynamic mechanical response of PBX–JH14C by using the Boltzmann superposition principle with a Prony series representation. Mathematical presentation of the relaxation modulus can be obtained by fitting the modulus master curve. The model was verified by comparing the finite element simulations with experimental results. Furthermore, it was observed that the theoretical prediction coincided with experimental results. The damage mode and mechanisms of PBX–JH14C were discussed based on the experimental and theoretical studies. In the absence of confinement, interface debonding and matrix cavitation were the predominant failure mechanisms under low speed impact.