拉挤成型碳纤维增强EP复合材料高低温力学性能

High and Low Temperature Mechanical Properties of Pultruded Carbon Fiber Reinforced EP Composites

为了研究环境温度对轨道交通车辆复合材料力学性能产生的影响,以4轴向碳纤维经编布为增强体,环氧树脂(EP)为基体,采用拉挤成型制备了碳纤维增强EP复合材料板。研究了复合材料在三种环境温度(–50,23,70℃)下的拉伸与弯曲性能,并计算B基准值。结果表明,随着温度的升高,其力学性能呈现下降趋势。开孔拉伸性能变化较小,弯曲性能更易受到温度的影响,与常温条件相比,高温状态下弯曲强度下降28.8%,弯曲弹性模量下降8.3%,低温下弯曲强度上升20.3%,弯曲弹性模量变化不大,仅为2.4%。从计算数据看,在复杂的环境温度下该种成型材料也能够基本满足较高的力学性能要求,为扩展碳纤维增强EP复合材料从小型辅助件到大型主体承力件的应用研究提供了依据。

In order to study the influence of ambient temperature on the mechanical properties of rail transit vehicle compos-ites,carbon fiber reinforced epoxy(EP)composite plates were prepared by pultrusion with 4-axial warp-knitted carbon fibers as rein-forcement and EP resin as matrix.The open-hole tensile and bending mechanical properties of composites were investigated at three ambient temperatures(-50,23,70℃),and the B reference values were calculated.The experimental results show that mechanical properties decrease as the temperature increases.Compared with room temperature,the bending strength decreases by 28.8%and the bending modulus decreases by 8.3%at high temperature.The bending strength increases by 20.3%at low temperature and the bending modulus changes only 2.4%at low temperature.From the data,this molding material can basically meet the requirements of high mechanical properties under complex ambient temperature,which provides a basis for the ap/+plication research of expanding carbon fiber reinforced composites from small auxiliary parts to large main body load-bearing parts.