湿热与拉伸载荷耦合作用下玻纤/环氧复合材料的吸湿特性

复合材料科学与工程 ›› 2020, Vol. 0 ›› Issue (5): 25-31.

湿热与拉伸载荷耦合作用下玻纤/环氧复合材料的吸湿特性

孙同生¹, 于存贵^1*, 杨文超^1,2, 仲健林¹

1.南京理工大学机械工程学院,南京210094;
2.江西长江化工有限责任公司,九江332006

收稿日期:2019-09-20 出版日期:2020-05-28 发布日期:2020-05-28
通讯作者: 于存贵(1965-),男,博士,副教授,主要从事聚合物基复合材料结构长期服役性能方面的研究,yu-cungui@njust.edu.cn。
作者简介:孙同生(1991-),男,博士研究生,主要从事聚合物基复合材料长期性能等方面的研究。
基金资助:
江苏省自然科学基金青年基金项目(BK20170837);中央高校基本科研业务费专项资金资助(309181B8807)

THE COMBINED EFFECTS OF HYGROTHERMAL AND EXTERNAL LOAD ON THEMOISTURE ABSORPTION BEHAVIOR OF E-GLASS/EPOXY COMPOSITES

SUN Tong-sheng¹, YU Cun-gui^1*, YANG Wen-chao^1,2, ZHONG Jian-lin¹

1.School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2.Jiangxi Changjiang Chemical Co., Ltd., Jiujiang 332006, China

Received:2019-09-20 Online:2020-05-28 Published:2020-05-28

摘要/Abstract

摘要： 为探究环境温度、相对湿度和外部拉伸载荷对聚合物基复合材料吸湿性能的影响,提出一种以温度、水分浓度和基体八面体剪应力为变量的特殊形式的Gibbs自由能函数,获得了湿热与拉伸载荷耦合作用下复合材料水分扩散控制方程。制备E-玻纤/环氧6509树脂复合材料层压板,通过自制压缩弹簧加载装置施加恒定拉伸载荷,在不同湿热环境下开展加速吸湿实验,利用响应曲面法获得代理模型以表征环境因素对平衡吸湿量和湿扩散系数的影响。结果表明:拉伸载荷作用下,基体八面体剪应力越大,复合材料的湿扩散系数和平衡吸湿量越大;升温能加速复合材料吸湿,而提高相对湿度会明显增加平衡吸湿量。利用响应面法获得的代理模型能够准确地预测玻璃纤维/环氧树脂复合材料在湿热与拉伸载荷耦合作用下的吸湿行为。

关键词: 复合材料, 多物理场耦合, 平衡吸湿量, 湿扩散系数, 基体八面体剪应力, Gibbs自由能

Abstract: This paper investigates the combined effects of hygrothermal and external tensile load on the moisture absorption behavior of E-glass/6509 epoxy composites. Governing equation for hygromechanical coupling diffusion is derived from the theory of irreversible thermodynamics. A new form of Gibbs free energy is introduced using temperature, moisture concentration and the matrix octahedral shear stress as independent state variables. Accelerated moisture absorption experiments in different hygrothermal environments were carried out with a self-made compression spring loading device, and response surface methodology (RSM) was used to establish a surrogate model for predicting the influence of environmental factors on the diffusion coefficient and equilibrium moisture content. The results show that moisture diffusion coefficient and equilibrium moisture absorption of composites increase with the increase of matrix octahedral shear stress. The moisture absorption of composites can be accelerated by increasing temperature, and the equilibrium moisture content can be increased by increasing the relative humidity. The surrogate model obtained by the response surface method can accurately predict the moisture absorption behavior of glass fiber/epoxy composites under the effect of hygromechanical coupling.

Key words: composite, multi-physics coupling, equilibrium moisture content, moisture diffusion coefficient, octahedral shear stress of matrix, Gibbs free energy

中图分类号:

TB332

孙同生, 于存贵, 杨文超, 仲健林. 湿热与拉伸载荷耦合作用下玻纤/环氧复合材料的吸湿特性[J]. 复合材料科学与工程, 2020, 0(5): 25-31.

SUN Tong-sheng, YU Cun-gui, YANG Wen-chao, ZHONG Jian-lin. THE COMBINED EFFECTS OF HYGROTHERMAL AND EXTERNAL LOAD ON THEMOISTURE ABSORPTION BEHAVIOR OF E-GLASS/EPOXY COMPOSITES[J]. Composites Science and Engineering, 2020, 0(5): 25-31.

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