GFRP 层压板挖补修理后的吸湿行为

对采用不同台阶比率挖补修理的玻璃纤维增强树脂基复合材料层合板进行了吸湿实验,获得了 各种台阶比率试样的吸湿规律以及损伤行为。通过面内剪切强度测试以及形貌观察,研究分析了导致吸湿试 件强度降低以及层间开裂的主要因素。实验发现:玻璃纤维增强树脂基复合材料的孔隙率是影响层合板吸湿 率和层间开裂的重要影响因素,孔隙率越高,吸湿率越高,但层间开裂倾向却降低;台阶比率对长时间吸湿试件 的强度保持率有较大的影响,恰当选择台阶比率不但有助于提高强度恢复率,还可减小因吸湿而产生的强度降 低幅度;吸湿会导致玻璃纤维增强树脂基复合材料层合板的面内剪切强度大幅度下降,导致这种结果主要原因 之一是吸湿会严重劣化纤维/ 树脂界面粘结状态。

Moisture Absorption Behavior on Scarf Patch Repair GFRP Laminates

Hygroscopic behavior was investigated with different scarf patch repair methods of GFRP laminates, then hygroscopic law and damage behaviors were gained. Main factors leading to decrease of hygroscopic property and interlaminar fracture were investigated and analysed through the in-plane shear properties tests and morphology observation, whch show that hygroscopic behavior increases with the increase of porosity, while the interlaminar fracture tendency decreases, the important factors influencing hygroscopy and interlaminar cracks is the porosity of GFRP laminates. Step ratio has a great influence on intensity of laminates, selecting the best step ratio is a good way to improve strength retention and decrease the strength reduction influenced by hygroscopic behavior. The investigation also confirms that hygroscopic behavior can seriously weaken fibre resin interface bonding state and the hygroscopic behavior is one of the main reasons which lead to the significant reduction of in-plane shear strength of laminates after moisture absorption.