孔隙对复合材料层压板湿热性能的影响

Influence of Void on the Hygrothermal Behaviour of Composite Laminates

摘要: 针对某飞机上应用的典型的层压板[(±45)/(0,90)2/(±45)]S和[(±45)/04/(±45)/(0,90)]S，研究了孔隙对碳纤维增强环氧树脂基复合材料层压板的吸湿性能、脱湿性能以及室温、湿热和脱湿层间剪切性能的影响。研究结果表明： 两种层压板的吸湿率和最大吸湿量随着孔隙率的增加而上升，层压板吸湿后出现了膨胀，表面出现了裂纹，大多数裂纹都位于层间树脂富集区，层压板内的孔隙在湿热作用下而产生了裂纹并且裂纹在孔隙之间扩展，复合材料层压板在脱湿后会有一部分水分残留，孔隙率大的试样残留的水分稍微多一些。含不同孔隙率层压板的层间剪切强度随着吸湿量的变化比较复杂。

Abstract: The influence of void on the moisture absorption, desorption and interlaminar shear strength (ILSS) of [(±45)/(0,90) 2/(±45)]S and [(±45)/04/(±45)/(0,90)]S composite laminates used in a aircraft was investigated. The results show that the rate of water uptake and the maximum level of moisture absorption in the two laminates increase with the increasing void content. Expand occurs in the two laminates after moisture absorption, and cracks were found on the surface of laminates. Most of cracks locate at the rich resin between the plies. Cracks can also be found around voids in the laminates and propagate between voids. Some water retained in the composite laminates after desorption and more water was kept in the laminates with larger void content. The ILSS of laminates with different void content varied complexly with the mass gain of moisture absorption.