复合材料湿热老化行为研究及其耐久性预测

复合材料科学与工程 ›› 2013, Vol. 0 ›› Issue (4): 28-34.

复合材料湿热老化行为研究及其耐久性预测

孙博, 李岩^*

同济大学航空航天与力学学院,上海 200092

收稿日期:2012-08-30 出版日期:2013-07-28 发布日期:2022-03-14
通讯作者: 李岩(1971-),女,教授,博士生导师,主要从事先进复合材料工艺、性能与表征,liyan@tongji.edu.cn。
作者简介:孙博(1985-),女,硕士研究生,主要从事玻璃纤维复合材料老化性能方面的研究。
基金资助:
国家自然科学基金(10872149)

THE STUDY ON HYGROTHERMAL AGING BEHAVIOR OF COMPOSITES AND THE PREDICTION MODEL OF DURABILITY

SUN Bo, LI Yan^*

School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China

Received:2012-08-30 Online:2013-07-28 Published:2022-03-14

摘要/Abstract

摘要： 本文研究了湿热老化环境对复合材料吸湿性能的影响,分析了材料弯曲强度、弯曲模量随老化时间的变化关系。研究结果表明,在湿热老化初期,材料吸湿变化满足Fickian扩散定律,在湿热老化后期材料增重率出现偏离Fickian定律的现象;随湿热老化时间的增加,复合材料的弯曲强度、弯曲模量均有不同程度的下降,并且在湿热老化后期复合材料弯曲强度受界面性能的影响显著。建立了复合材料力学性能与湿热老化时间的定性/定量关系,在耐久性预测模型中引入界面参数的概念,拟合结果与实测值较为接近。

关键词: 复合材料, 湿热老化, 吸水行为, 力学性能, 耐久性

Abstract: In this study,the effects of hygrothermal environments on the durability of glass fiber reinforced epoxy composites were investigated including physical and chemical degradation. In order to assess the durability of such systems,an investigation was undertaken in the hydrothermal conditions with different temperatures. Inter-laminar shear test and bending test were obtained periodically to study the mechanical degradation. The moisture absorption response of the composites was also determined over an 80-week period. In addition,scanning electron microscope photos of the composites were obtained before and after aging. The samples were also analyzed by means of Fourier transform infrared spectroscopy (FTIR) to identify degradation products and estimate the influence of glass fiber and polymer on chemical degradation of the studied composites. The result shows in the first stage the weight gain increased gradually over time,and it was in accordance with the Fickian Law,while in the second stage, weight gain of composite dropped down. The flexural properties reduced gradually with aging time,the interface performance was seriously impact. The prediction model was set up based on the time-temperature equivalence principle and experimental data. During the later period of aging,the fracture mode was mainly delamination,so the model was modified by an interface factor,and it showed a quite good agreement with the experimental value.

Key words: composites, hygrothermal aging, water absorption behavior, mechanical properties, durability

中图分类号:

TB332

孙博, 李岩. 复合材料湿热老化行为研究及其耐久性预测[J]. 复合材料科学与工程, 2013, 0(4): 28-34.

SUN Bo, LI Yan. THE STUDY ON HYGROTHERMAL AGING BEHAVIOR OF COMPOSITES AND THE PREDICTION MODEL OF DURABILITY[J]. COMPOSITES SCIENCE AND ENGINEERING, 2013, 0(4): 28-34.

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