在动态冲击下对碳纤维增强聚乙烯基的热力学合效应进行实验研究
Shuyan Nie1, Liming Chen1, Zhaoxin Yun1
1College of Aerospace Engineering, Chongqing University, Chongqing 400030, China.
Polymers
|August 29, 2024
概括
高温显著降低了碳纤维增强聚乙烯基 (CF/PEEK) 的机械性能,而增加的应变率通常会增强它们,复杂的相互作用会影响极端环境中的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 复合材料 复合材料 复合材料
背景情况:
- 碳纤维增强聚乙基 (CF/PEEK) 复合材料具有出色的机械性能和耐高温,对于航空航天和汽车应用至关重要.
- 在动态负载下CF/PEEK的热力学合行为仍然不够理解,这限制了其在极端环境中的应用.
研究的目的:
- 为了研究 CF/PEEK 复合材料在高拉变速率下的热力学合效应.
- 描述温度和拉伸率对CF/PEEK机械性能和微伤害机制的影响.
主要方法:
- 利用霍普金森棒撞击测试来模拟动态负载条件.
- 使用扫描电子显微镜 (SEM) 进行详细的微观结构分析和损伤特征.
- 在各种温度和应变率下进行实验,以评估热力学合.
主要成果:
- 温度上升显著降低了CF/PEEK的产量强度,峰值应力和特定能量吸收.
- 提升的应变速率通常会诱导应变硬化,提高产量强度,峰值应力,特定能量吸收和断裂应变.
- 在4000s-1以上,应变硬化对产量强度和峰值应力的影响减少,温度进一步削弱了这一影响.
结论:
- 温度和应变速率的相互作用极大地影响CF/PEEK在动态冲击下的机械性能.
- 在更高的温度下,接口解接和矩阵软化会改变应力转移机制和材料性.
- 结果为优化CF/PEEK设计和在苛刻环境中的应用提供了关键的见解.
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