水分-载荷耦合作用下2D编织复合材料的力学行为
Mechanical behavior of 2D braided composites under the coupling effect of moisture and load
成朝辉 1刘斌 1向栋 2徐绯 1冯威1
作者信息
- 1. 西北工业大学 航空学院,西安 710072
- 2. 西北工业大学 航空学院,西安 710072;重庆红宇精密工业集团有限公司,重庆 402760
- 折叠
摘要
为了研究长期水分-载荷耦合作用下2D编织复合材料的吸湿行为及性能劣化规律,设计了水分-载荷耦合环境老化装置,开展了不同应力水平下碳纤维增强环氧树脂(T300/H69)平纹编织复合材料的吸湿试验及吸湿后的拉伸试验.结果表明:T300/H69编织复合材料的吸湿量与拉伸预应力总体上呈现正相关,随着拉伸预应力的增大而增大;相对于水分单独作用,水分-载荷耦合作用下材料的弹性模量和强度退化更明显,在140％σs(σs为屈服强度)预应力下作用432 h后,编织复合材料的弹性模量及失效强度分别下降达55.9％和35.4％.此外,通过宏微观断面分析,进一步揭示长期水分-载荷耦合作用下编织复合材料性能的退化机制,并基于Shiva剩余强度理论,改进了水分-载荷作用下复合材料的剩余强度模型,预测结果良好,为复杂环境下复合材料耐久性设计提供指导.
Abstract
In order to study the moisture absorption behavior and performance degradation law of 2D braided composites under long-term moisture-load coupling,a moisture-load coupled aging device was designed.The moisture absorption test and tensile test after moisture absorption of carbon fiber reinforced epoxy resin(T300/H69)plain woven composite material under different stress levels were carried out.The results show that the moisture absorption of T300/H69 braided composites is positively correlated with the tensile prestress,and in-creases with the increase of tensile prestress.Compared with the effect of water alone,the elastic modulus and strength degradation of the material under moisture-load coupling are more obvious.After 432 h at 140％σs(σs is yield stress)prestress,the elastic modulus and failure strength of the braided composites decreased by 55.9％and 35.4％,respectively.In addition,the degradation mechanism of braided composites under long-term moisture-load coupling is further revealed by macro and micro section analysis.Based on Shiva's residual strength theory,the re-sidual strength model of composites under moisture-load is improved,and the prediction results are good,which provides guidance for the durability design of composites in complex environment.
关键词
水分-载荷耦合/2D编织复合材料/吸湿/剩余强度/失效机制Key words
moisture-load coupling/2D braided composites/moisture absorption/residual strength/failure mechanism引用本文复制引用
基金项目
国家自然科学基金(12272320)
国家自然基金青年项目(12202336)
中央高校基本科研业务费专项资金(D5000230141)
出版年
2024
NETL
NSTL
万方数据