纤维类别对三维浅交弯联复合材料弯曲性能影响的数值模拟

Simulation of influence of fiber variety to bending properties of 3D curved shallow-crossing linking woven composites

借助绘图软件PRO/E建立一种三层三维浅交弯联机织复合材料结构细观模型,并借助大型有限元软件ANSYS对该复合材料的弯曲力学性能进行模拟分析。分别将纤维材料定义为玻璃纤维和碳纤维,树脂基体定义为环氧树脂E51。对比在1kN的弯曲载荷作用下,两种不同类别纤维作为增强体时的复合材料、纤维增强体和树脂基体的应力、应变分布情况,预测复合材料的破坏形式,并与实验结果定性对比。结果表明,玻纤作为增强体时比碳纤维表现出更大的弯曲应力和弯曲应变,更容易发生破坏;1kN弯曲载荷作用下复合材料的破坏形式主要为纤维增强体的变形,树脂基体的碎裂以及纤维增强体和树脂基体间的脱粘。

A new structural model,was built to study the bending properties,with the help of finite element software ANSYS Workbench,of three-dimensional curved shallow-crossing linking woven composites（3Dcomposites）,using mapping software Pro/Engineer.Material of fibers were defined as E-glass fiber and carbon fiber respectively,resin matrix was defined as epoxy resin E51.The distribution of stress strain on fibers,resin and 3Dcomposites,as well as the failure mode,was discussed and predicted respectively,under 1kN bending loads.Simulated result is compared with test result qualitatively.The results show that,the 3Dcomposites with E-glass fiber as fiber-reinforcement present larger stress and strain and damage more easier than the carbon one;the main failure mode of the 3Dcomposites was deformation of fibers,separation between fibers and resin and resin fracture,under 1kN bending loads.