固化温度对碳纤维/环氧基体界面行为影响的分析

对界面粘结性能及热残余应力影响下的单纤维复合材料的界面行为进行了分析。采用界面的弹性-软化内聚力模型，用解析法对单纤维复合材料由固化引起的热残余应力、以及单纤维碎断过程纤维的轴向应力分布进行了模拟,得到了碳纤维/环氧树脂在常温和高温固化两种情况的界面粘结性能。结果表明：与常温固化相比，高温固化后，界面的剪切强度增幅不大，界面的断裂韧性显著增加；高温固化后形成的界面，使界面的软化提前、界面的脱粘延迟；高温固化产生的纤维轴向和界面径向热残余应力对界面的软化均有延迟作用；界面径向热残余应力还对界面的脱粘有延迟作用。

Analysis of the influence of cure temperature on interfacial behavior of carbon fibre/epoxy matrix

Analytical study was performed to determine the interface behavior affected by interfacial properties and the thermal residual stress. A cohesive zone model governed by the elastic-softening law described the fiber/matrix interface was used to simulate the thermal residual stress developed during the curing process and the fiber axial stress during fragmentation process. The interfacial properties of carbon fiber/epoxy resin cured either at room temperature or at high temperature were obtained. The results indicates that, compared with the room temperature curing, after high temperature curing, the interfacial shear strength increases slightly, and the interfacial fracture toughness increases significantly. The interface softening appears early, but the interface debonding is delayed after high temperature curing. In addition, both the fiber axial and interfacial radial thermal residual stresses delay the interface softening, and the interface debonding is delayed by the interfacial radial thermal residual stress.