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采用试验与理论相结合的方法,研究了玻璃纤维/环氧树脂复合材料的吸湿老化剩余强度,测试了基体的吸湿性能,对老化前后基体、纤维及其复合材料的拉伸性能进行了试验研究。根据纤维和基体性能测试数据,应用桥联模型计算了复合材料的吸湿老化剩余强度,计算结果与试验结果一致。结果显示:在小吸湿率条件下,利用桥联模型能够准确预测复合材料的破坏演化规律及其最大剩余强度。当主承力层破坏由纤维控制时,由湿老化引起的纤维强度的下降直接导致复合材料最大拉伸强度的下降;当破坏由基体控制时,影响复合材料吸湿剩余强度的主要因素是基体硬化及强度的下降。较小吸湿率对纤维与基体的界面粘结强度影响有限,界面破坏不是层合板破坏的主要因素。
The combination of test and theory was used to study the hygroscopic residual strength of glass fiber / epoxy composites. The hygroscopic property of the composites was tested. The tensile properties of the matrix, fiber and composites before and after aging were tested . According to the test data of fiber and matrix properties, the residual strength of hygroscopic aging of composites was calculated by using the bridge model. The calculated results are consistent with the experimental results. The results show that under the condition of small moisture absorption rate, the bridge failure model can accurately predict the failure evolution and the maximum residual strength of the composites. When the failure of the main bearing layer is controlled by the fibers, the decrease of the fiber strength caused by wet aging directly leads to the decrease of the maximum tensile strength of the composites. When the damage is controlled by the matrix, the main factors affecting the residual strength of the composite are the substrate hardening and Decreased intensity. Smaller moisture absorption has a limited influence on the interfacial bonding strength between the fiber and the matrix, and interfacial failure is not a major factor in the failure of the laminate.