利用二维有限元模型对单向T700炭纤维/3234环氧树脂复合材料内部热应力分布进行了数值模拟,同时测试了T700/3234复合材料经不同次数真空热循环后的拉伸强度。研究结果表明,随热循环次数增加,基体应力单调下降,界面应力先下降后上升,25次热循环后变化趋于平缓。界面区域内热应力最大,且产生明显的应力集中。部分界面出现脱粘是复合材料在热循环作用下产生损伤的主要原因。
A 2-D finite element analysis was employed to analyze the thermal stress distribution in a unidirectional T700 carbon fiber/3234 epoxy resin composite.And the transverse tensile strength of the composite experiencing various vacuum thermal cycles was evaluated.The results indicate that the thermal stress of the matrix reduces gradually with the increase of thermal cycles,while the stress of the fiber-matrix interface firstly decreases and then increases,and finally reaches the minimum after 25 thermal cycles.The maximum thermal stress is found to locate at the fiber-matrix interface.Fiber-matrix de-bonding is the main damage in the composite due to thermal cycling.
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