间隙率对平纹及三轴向织物复合材料弹性性能的影响

采用有限元分析方法研究了间隙率对平纹及三轴向复合材料叠层弹性性能的影响.首先,根据平纹织物复合材料几何构型和基本参数,建立了平纹织物复合材料的面密度和单胞边长与间隙率之间的关系;然后,建立了平纹织物复合材料的拉伸、压缩和剪切有限元模型,利用该模型分析了间隙率对其弹性性能的影响;最后,分析了间隙率对平纹织物复合材料与三轴向织物复合材料叠层弹性性能的影响.研究发现,平纹织物复合材料的比拉伸模量和比压缩模量随其间隙率的增加而略微增加,比剪切模量随其间隙率的增加减小,平纹织物复合材料与三轴向织物复合材料叠层的等效模量极曲线平纹织物复合材料的间隙率的增加而极性减弱.

Effect of Gap Ratio on Elastic Properties of Plain Weave Fabric and Laminate With Triaxial Weave Fabric Composites

The effect of gap ratio on elastic properties of plain weave fabric( PWF) and laminate with triaxial weave fabric(TWF) and PWF composites was numerically investigated by FEA method. Firstly, based on geometry construction and basic parameters of PWF composites, the relationship was determined between both surface density and length of representative unit cell and gap ratio. Secondly, the tension, compression and tear model of PWF composites are established to study the effect of gap ratio on elastic properties of PWF composites. Finally, the effect of the gap ratio on the laminate with PWF and TWF composites was investigated. It is found that the specific stiffness of tension and compression increase with the increasing of gap ratio, and the specific stiffness of tear increases with the increasing of gap ratio. The polarity of polar curve of equivalent stiffness of laminate with PWF and TWF composites decreases with the increasing of gap ratio of PWF composites.