玻璃纤维二维平纹编织复合材料高温弯曲力学行为研究

High Temperature Bending Behavior of Glass Fiber 2-D Braided Textile Composites

对玻璃纤维2维平纹编织复合材料在6个不同温度下的弯曲性能进行了实验测试,研究了温度对编织复合材料层合板的载荷-挠度曲线、弯曲强度、弯曲模量和失效模式的影响。结果表明:在三点弯曲载荷作用下,2维编织复合材料层合板跨中发生了局部纤维束屈曲失效和基体的开裂与分层失效。温度对玻璃纤维复合材料的力学性能和失效形式产生了重要影响。在高温环境中玻璃纤维2维平纹编织复合材料的弯曲力学性能迅速下降,当试验温度从20℃升高至115℃时,层合板的弯曲强度和模量分别下降了91%和66%。随着温度的升高,2维编织复合材料层合板的弯曲失效变形行为也发生了转变,逐渐由脆性破坏转变为塑性变形失效。

The bending properties and failure mechanisms of glass fiber 2-D braided textile composites were tested at 6 different temperatures. The effect of temperature on the bending load-deflection curves, bending strength, bending modulus and the failure mode of 2-D braided textile composites were studied. The results show that: the local fiber tows buckling and matrix cracking are the main failure mode of 2-D braided textile composites under three point bending load. Temperature has a signifi cant eff ect on mechanical properties and failure behaviors of 2-D braided textile glass fiber composites. The bending mechanical properties of 2-D braided textile glass fiber composites decrease rapidly at high temperature. Especially when the test temperature increases from 20℃ to 115℃ , the bending strength and modulus of composite laminates decrease by 91% and 66%.With the increase of temperature, the bending failure and deformation behavior of 2-D braided composite laminates change from brittle failure to plastic failure.