酸盐塑化聚乙烯推进剂的裂纹传播研究:实验和模拟
Hanwen Liu1, Jiangning Wang1, Xiaolong Fu1
1Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
Materials (Basel, Switzerland)
|May 25, 2024
概括
酸乙烯塑化聚乙烯 (NEPE) 推进剂的断裂性使用单边口拉伸试验进行了研究. 结果显示,折断性随着拉伸率的增加而增加,这对于固体火箭发动机性能至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 固体推进剂力学 固体推进剂力学
- 断裂力学 断裂力学 断裂力学
背景情况:
- 酸盐塑化聚乙烯 (NEPE) 推进剂对于固体火箭发动机至关重要.
- 了解其断裂特性对于确保电机可靠性和安全性至关重要.
研究的目的:
- 为了研究NEPE推进剂在不同的拉力率下的断裂特性.
- 为了确定拉伸率和断裂性之间的关系.
- 提出固体火箭发动机运行评估的标准.
主要方法:
- 单边切口张力 (SENT) 试验在20°C进行,拉力率从10到500毫米/分钟.
- 使用高速摄像机和绘图机来分析机械反应和裂传播.
- 基于纽带的周动力学 (BBPD) 数值模拟进行,以模拟骨折行为.
主要成果:
- NEPE推进剂表现出的骨折和波动的裂传播速度.
- 断裂性显示出明显的速率依赖性,临界应力强度因子 (Kc) 增加了62.3%,因为拉伸速率从10升至500毫米/分钟.
- BBPD模拟准确地预测了实验负载位移曲线和裂传播速度.
结论:
- NEPE推进剂的断裂性受到拉伸率的显著影响.
- 与Kc相关的标准可以帮助评估固体火箭发动机的正常运行.
- BBPD建模为模拟NEPE推进剂断裂提供了一种可靠的方法.
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