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装填速率对复合改性双基推进剂动态起裂断裂韧性影响的研究

Research on the influence of loading rate on the dynamic initiation fracture toughness of CMDB propellant.

作者信息

Zheng Jian, Wu Xuan, Sun Zhengwei, Guo Zongtao, Zhang Menglong, Chen Xiong

机构信息

School of Mechanical Engineering, Key Laboratory of Special Engine Technology, Ministry of Education, Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China.

出版信息

Sci Rep. 2024 Dec 30;14(1):32115. doi: 10.1038/s41598-024-83854-x.

DOI:10.1038/s41598-024-83854-x
PMID:39738792
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11686013/
Abstract

In the field of gun launched missile extended range rocket, the propellant grain in the rocket needs to withstand significant launch loads during their firing phase, and also bear the high pressure caused by ignition, and the impact of launch overloads and ignition shocks on the structural integrity of propellants becomes very important. So this work investigated the dynamic initiation fracture toughness of the composite modified double-base (CMDB) propellant by both experiments and numerical simulations. The dynamic mechanical properties test of the cracked straight through flattened Brazilian disc (CSTFBD) specimens were conducted using a modified Split Hopkinson pressure bar (SHPB). By comparing the results of quasi static and dynamic numerical simulations, it was found that dynamic fracture initiation toughness can be determined by time-to-fracture using the quasi-static theory. The numerical simulation results combined with the ZWT constitutive model agree well with the experimental results, indicating that ZWT constitutive model is suitable for numerical simulation calculation of propellant structural integrity under dynamic load, and provides a theoretical basis for propellant structural integrity analysis under dynamic load. During the measurement of the mechanical response, the fracture surfaces of the dynamic test specimens were observed by electron microscopy scanning. Then the evolution of the microstructure synchronously was obtained. The scanning electron microscope (SEM) results revealed that fracture modes and breakage of the ammonium perchlorate (AP) particles in the surface layer played an important role in determining the failure mechanism, which revealed the failure mechanism of the propellant under dynamic load. The result of experimental measurement showed the influence of loading rate on the dynamic fracture initiation toughness of CMDB propellant.

摘要

在炮射导弹增程火箭领域，火箭中的推进剂药柱在点火阶段需要承受巨大的发射载荷，还要承受点火产生的高压，发射过载和点火冲击对推进剂结构完整性的影响变得至关重要。因此，本工作通过实验和数值模拟研究了复合改性双基（CMDB）推进剂的动态起始断裂韧性。采用改进的霍普金森压杆（SHPB）对贯穿裂纹扁平巴西圆盘（CSTFBD）试样进行动态力学性能测试。通过比较准静态和动态数值模拟结果，发现可以使用准静态理论通过断裂时间来确定动态断裂起始韧性。结合ZWT本构模型的数值模拟结果与实验结果吻合良好，表明ZWT本构模型适用于动态载荷下推进剂结构完整性的数值模拟计算，为动态载荷下推进剂结构完整性分析提供了理论依据。在力学响应测量过程中，通过电子显微镜扫描观察动态测试试样的断口。进而同步获得微观结构的演变情况。扫描电子显微镜（SEM）结果表明，表层高氯酸铵（AP）颗粒的断裂模式和破碎在确定失效机制中起重要作用，揭示了推进剂在动态载荷下的失效机制。实验测量结果显示了加载速率对CMDB推进剂动态断裂起始韧性的影响。

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