在不同的环境条件下,研究碳织物/聚乙基基复合材料的机械性能
Xiangyu Xu1, Baoyan Zhang1, Fenghui Shi1
1AVIC Manufacturing Technology Institute Composite Technology Center, Beijing 101300, China.
Polymers
|May 14, 2025
概括
环境条件显著影响碳织物增强聚乙基基 (CFF/PEKK) 复合材料. 寒冷,干燥的环境增强了强度,而炎热,潮湿的环境会降低曲和剪切性能,特别是间层剪切强度.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物复合材料 聚合物复合材料
背景情况:
- 碳织物增强聚乙基基 (CFF/PEKK) 复合材料为工程应用提供了卓越的性能.
- 环境因素极大地影响复合材料的机械行为和使用寿命,但在各种条件下对CFF/PEKK的数据有限.
研究的目的:
- 研究环境条件对CFF/PEKK复合材料曲和剪切性能的影响.
- 提供支持CFF/PEKK复合材料在不同环境暴露下工程应用的数据.
主要方法:
- 制造CFF/PEKK层材 (55体积%的纤维部分).
- 在70°C的湿度吸收测试以确定吸收特性 (平衡率~0.27%).
- 在三个条件下进行机械测试 (曲和剪切): -55 °C干燥 (CTD),室温干燥 (RTD) 和70 °C湿 (ETW).
- 对故障模式和机制的分析.
主要成果:
- 湿热老化导致纤维拉出,表明界面降解,但没有裂或分层.
- 与RTD相比,CTD条件中的曲和剪切强度更高;模块不受影响.
- 在70°C湿 (ETW) 条件下,曲和剪切性能显著降低,间层剪切强度降低最大.
- 在所有测试的环境条件中,故障模式一致.
结论:
- 环境条件,特别是湿度和温度,显然会改变CFF/PEKK复合材料的机械性能.
- 该材料在寒冷,干燥的环境中表现出增强的强度,但在炎热,潮湿的条件下显著降解.
- 接口完整性是受高热衰老影响的关键因素,影响复合材料的整体性能.
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