在不同拉伸负荷条件下对高填充的氧终结聚乙烯推进剂的机械性能和故障机制的研究
Chengfeng Wu1, Yingying Lu1, Ming Jiang1
1Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
Polymers
|October 14, 2023
概括
分析了高度填充的基终结聚乙烯 (HTPB) 推进剂的机械性能. 它的强度和延长高度依赖于温度和应变率,故障主要是由于矩阵撕裂和潮湿.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 机械工程 机械工程
背景情况:
- 固体推进剂是重要的能量材料.
- 了解它们的机械性能对于安全性和性能至关重要.
- 由于填充剂-矩阵相互作用,高度填充的推进剂带来了独特的挑战.
研究的目的:
- 为了研究高度填充的基终结聚丁 (HTPB) 推进剂的机械行为.
- 为了确定温度和拉伸率对推进剂应力-拉伸反应的影响.
- 分析故障机制并建立机械性质主曲线.
主要方法:
- 单轴拉伸试验在温度范围为-50°C至70°C之间进行,拉伸速率从0.000476到0.119048s-1.1之间进行.
- 动态机械分析 (DMA) 用于确定玻璃过渡温度和低温效应.
- 使用扫描电子显微镜 (SEM) 检查断裂表面和故障模式.
主要成果:
- 最大抗拉强度随着温度的增加而下降,随着延展率的增加而增加.
- 最大延长随着温度的增加而增加,随着延展率的增加而减少.
- 最低的强度 (0.35MPa) 和最高的延伸度 (44%) 在343.15K和0.000476s-1.1时发生.
- 失效机制涉及矩阵撕裂和潮湿,没有证据表明粒子断裂.
结论:
- HTPB推进剂的机械性能受到温度和拉伸率的显著影响.
- 建立了主曲线,以预测各种条件下的推进剂行为.
- 识别的故障模式为推进剂的配方和设计提供了洞察力.
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