耐久性/老化英文2025被引 2
高温和吸湿老化对碳纤维增强复合材料层间力学性能的影响
Effect of high temperature and hygrothermal aging on interlaminar mechanical properties of carbon fiber reinforced plastics
Feng Li, Tian Lv, Qianhui Xu, Liming Zhou · National Key Laboratory of Automotive Chassis Integration and Bionics, School of Mechanical and Aerospace Engineering Jilin University Changchun China
摘要整理
碳纤维增强复合材料(CFRP)在汽车轻量化领域具有广阔的应用前景,但其在吸湿热环境下的性能衰退机制仍是制约工程应用的关键问题。本研究重点关注高温与湿度耦合作用下CFRP层间力学性能的衰退机制。通过加速老化实验和多尺度表征,分析了吸水率与层间强度的关联性。结果表明:在高温环境(80°C、25% RH)下,短期老化约360 h内,后固化效应导致层间拉伸和剪切破坏强度分别增加7.5%和6.9%;长期老化约1440 h后,热氧降解作用减缓了强度增长。在高温/高湿环境(80°C、95% RH)下,CFRP的吸水率随老化时间呈非线性增长,约1080 h后达到平衡,层间拉伸和剪切强度分别下降34.5%和33.5%。基于层间强度数据,建立了考虑吸湿热衰退因素的CFRP层间内聚力区模型,可预测任意老化时间的失效情况,为CFRP构件的层间性能衰退和耐久性设计提供重要参考。
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