玻纤/环氧树脂复合材料非线性粘弹性响应  

Nonlinear viscoelastic response of E⁃glass fiber/epoxy resin composites

作　　者：孙同生 于存贵[1] 杨文超 仲健林 SUN Tongsheng;YU Cungui;YANG Wenchao;ZHONG Jianlin(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Jiangxi Changjiang Chemical Co.,Ltd,Jiujiang 332006,Jiangxi,China)

机构地区：[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,江西九江332006

出　　处：《哈尔滨工业大学学报》2020年第7期133-138,共6页Journal of Harbin Institute of Technology

基　　金：江苏省自然科学基金青年项目(BK20170837);中央高校基本科研业务费专项资金资助(NO.309181B8807)。

摘　　要：为研究玻璃纤维增强环氧树脂基复合材料的非线性粘弹性响应,采用Schapery模型描述复合材料的非线性粘弹性,并在不同应力水平下分别对[90]16横向试样和[±45]4S面内剪切试样开展拉伸蠕变-回复试验.根据试验观察到的残余粘塑性应变现象,在Schapery模型中引入粘塑性应变分量,提出一种基于解析法的非线性参数辨识方法,获得了Schapery非线性参数g0,g1,g2和aσ随应力的变化规律.结果表明:当施加的横向拉伸应力大于横向拉伸强度的53%,面内剪切应力大于剪切强度的31%时,玻纤/环氧复合材料表现出明显的非线性粘弹性;横向上,非线性参数g0T和g2T与应力无关,g1T随应力线性增加,aσT随应力线性降低;面内剪切方向上,非线性参数g0S和g2S随应力呈指数增加,g1S随应力线性增加,aσS则随应力线性降低.与传统的非线性参数辨识方法相比,所提出的参数辨识方法能方便准确地获取非线性参数随应力的变化规律.To investigate the nonlinear viscoelastic response of E-glass fiber reinforced epoxy resin matrix composite,Schapery's model was used to describe the nonlinear viscoelasticity of composites,and the tensile creep/creep-recovery tests were carried out for[90]16 transverse specimens and[±45]4S shear specimens at different stress levels.According to the observed residual phenomena,a viscoplastic strain component was introduced into the Schapery's model and a method based on the analytical procedure for identifying the nonlinear viscoelastic parameters was proposed.The Schapery's nonlinear parameters g 0,g 1,g 2 and aσwere calculated,which are functions of the applied stress.The results show that the E-glass/epoxy composite exhibits obvious nonlinear viscoelasticity if the applied stress is higher than 53%of the tensile strength in transverse direction and 31%of the shear strength in the in-plan shear direction.In the transverse direction,the nonlinear parameters g 0T and g 2T are independent of stress,while g 1T increases linearly with stress,and aσT decreases linearly with stress.In the in-plane shear direction,the nonlinear parameters g 0S and g 2S increase exponentially with stress,while g 1S increases linearly with stress,and aσS decreases linearly with stress.Compared with the traditional nonlinear parameter identification method,the proposed method can obtain the relationship between nonlinear parameters and the applied stress conveniently and accurately.

关 键 词：聚合物基复合材料 非线性粘弹性 Schapery模型 蠕变-回复试验 参数辨识 长期性能 

分 类 号：TB332[一般工业技术—材料科学与工程]