海泡石增强橡胶密封复合材料横向压缩性能的细观力学模型  

Micromechanical Model for Predicting Transverse Compressive Property of Sepiolite Reinforced Rubber Sealing Composite

作　　者：张斌[1] 宇晓明[2] 顾伯勤[2] 

机构地区：[1]常熟理工学院机械工程学院,江苏常熟215500 [2]南京工业大学机械与动力工程学院,江苏南京211816

出　　处：《高分子材料科学与工程》2016年第10期79-83,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51375223);江苏省高校研究生科研创新计划项目(KYZZ15-0230);新引进教师科研启动基金项目(KYZ2015053Z)

摘　　要：制备了海泡石增强橡胶密封复合材料(SRRC),对其横向压缩力学性能进行了测试。采用扫描电子显微镜观察了试样断面上的海泡石纤维分布状况,建立了单分散和多分散纤维体系的代表性体积单元(RVE)模型。通过Abaqus有限元软件建立了SRRC的计算模型,采用连续的网格重划技术,预测了SRRC的大变形行为。结果表明,当纤维体积分数较小时,压缩应力随应变呈线性增加;当纤维体积分数达到42%时,随着应变的增加,应力-应变曲线呈明显的非线性;增加海泡石纤维的体积分数,能够有效提高SRRC的弹性模量和压缩强度。通过对RVE模型进行2次网格重划,可使模型的压缩应变达到0.4。相比于单分体系,多分散体系RVE模型的预测结果与实验值更为接近。Sepiolite reinforced rubber sealing composite（ SRRC） was prepared and its transverse compression property was obtained by experiment. The distribution of sepiolite fiber in the section of sample was observed by scanning electron microscope（ SEM）,and the representative volume element（ RVE） models of monodisperse and polydisperse fiber systems were established. Abaqus software was used to build the numerical model of SRRC. A successive remeshing strategy was employed to predict the large deformation behavior of SRRC. The results show that the stress-strain relationship of SRRC is linear with low fiber volume fraction,and it is nonlinear with high fiber volume fraction（ 42%）. The results also indicate that the elastic modulus and compressive strength of SRRC increase with the increase of fiber volume fraction. The numerical results show that the compressive strain can attain 0. 4 after two successive remeshings of the RVE model. Compared with the monodisperse system,the calculation results of the RVE model of polydisperse system are closer to experimental data.

关 键 词：复合材料 橡胶 大变形 网格重划 横向压缩 

分 类 号：TB332[一般工业技术—材料科学与工程]