植物纤维复合材料层合板吸湿层间应力分析  

Hygroscopic Interlaminar Stresses Analysis of Plant Fiber Composite Laminates

作　　者：姚欣欣 沈珉[1] 徐兴春 YAO Xinxin;SHEN Min;XU Xingchun(Department of Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin 300350,China;Center for Composite Materials and Structures,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]天津大学机械工程学院力学系,天津300350 [2]哈尔滨工业大学复合材料与结构中心,黑龙江哈尔滨150001

出　　处：《材料科学与工程学报》2020年第6期941-946,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(10972155,81670884)。

摘　　要：为研究吸湿对植物纤维层合板层间应力的影响,采用超弹性吸湿本构模型来描述剑麻纤维增强苯甲基化木材(SFRBW)复合材料的吸湿力学行为,用Fortran语言编写了有限元用户材料子程序,建立了SFRBW层合板三维有限元模型,分析了不同湿度对不同铺设角的SFRBW斜交层合板受拉伸时的层间应力和自由边缘效应的影响。数值结果表明,对于斜交层合板,湿度对层间切应力τ13的影响最大;随着湿度的增加,层间应力集中会降低,缓解了层合板的自由边缘效应,在所有的斜交层合板[±θ]S中,[±15]S层合板层间应力τ13数值达到最大,[±55]S层合板层间应力τ13数值为零。该研究结果为湿环境下斜交层合板的优化设计提供了数值分析依据。In order to study the effect of hygroscopicity on the interlaminar stresses of plant fiber laminates,hygroscopic mechanical behavior of sisal fiber reinforced benzylated wood(SFRBW)composites was described by hyperelastic hygroscopic constitutive model.A finite element user material subroutine was written in Fortran language.A three-dimensional finite element model(FEM)of SFRBW laminates was established.Effects of different humidity on the interlaminar stresses and free-edge effect of SFRBW angle-ply laminates with different ply angles under tension were analyzed.Numerical results show that humidity has the greatest influence on the interlaminar shear stressτ13 for angle-ply laminates;with the increase of humidity,interlaminar stresses concentration decreases and free-edge effect of laminates is alleviated.Among all angle-ply laminates[±θ]S,interlaminar stressτ13 reaches the maximum value at[±15]S,and interlaminar stressτ13 is zero at[±55]S.Research results provide a numerical basis for optimum design of angle-ply laminates in wet environment.

关 键 词：植物纤维复合材料 吸湿本构模型 层间应力 自由边缘效应 有限元分析 

分 类 号：TB332[一般工业技术—材料科学与工程]