吸湿环境下环氧树脂内应力场的确定  

Inner stress field in epoxy resin with moisture absorption

作　　者：彭术 倪爱清[1] 王昌增 王继辉[2] PENG Shu;NI Aiqing;WANG Changzeng;WANG Jihui(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《复合材料学报》2023年第12期6841-6851,共11页Acta Materiae Compositae Sinica

摘　　要：环氧树脂及其制品因其优良性能广泛应用在船舶制造中,长期在潮湿环境中服役时,基体吸收水分易引起膨胀翘曲等变形,进而引发失效隐患。本文采用重量分析试验、光纤布拉格光栅(FBG)传感器应变监测技术,确定了环氧树脂中的饱和吸湿量、水分扩散系数和湿膨胀系数等吸湿系数,在此基础上构建了能够预测环氧树脂中随时间变化的水分扩散及应力场分布的湿-力模型,用有限元方法实现了对随吸湿时间变化的树脂中应力场的数值模拟。并结合相移数字光弹试验方法,将数值模拟结果与试验结果进行了比较,显示了良好的一致性,发现环氧树脂吸湿过程中切应力随时间呈现出先升后降的趋势。Epoxy and epoxy-based components have been extensively used in marine industry due to their excellent performance.When exposed to moist environment,the matrix of such materials absorbs significant amount of water and damages are caused including warpage,expansion and other deformations.In this study,weight analysis experiment were carried out and fibre Bragg grating(FBG)sensors were used to monitor the effects of moisture absorption.The maximum water absorption,water diffusion coefficient,and coefficients of moisture expansion were determined thereafter.Numerical simulation was then built accordingly by finite element method to predict the evolution of moisture absorption and the stress field developed in the epoxy resin.Finally,the simulation results were compared with the experimental ones by phase-shift digital photoelastic method and good agreement is achieved.The shearing stresses in the resin show the trend of initial increase and later decline during the course of water absorption.

关 键 词：环氧树脂 水分扩散 相移数字光弹法 光纤布拉格光栅 应力分布 

分 类 号：TB324[一般工业技术—材料科学与工程] TB332