石英纤维/氰酸酯树脂复合材料胶接面的激光处理研究

Study on laser treatment of quartz fiber/cyanate ester resin composite bonding surfaces

胶接是复合材料结构连接的主要方式之一,而胶接面的表面处理对胶接性能有显著的影响。本文采用紫外激光对氰酸酯树脂基复合材料的胶接面进行处理,研究了激光参数对表面形貌、胶接性能等的影响规律。数值模拟结果显示激光热影响区很小,且根据纤维与树脂的温度响应及各自的气化温度可知激光处理以表面树脂消融为主。表面形貌观察发现:激光处理时会因为氰酸酯树脂的不完全热解而形成炭黑。准静态单搭接胶接拉伸剪切试验结果表明合适的激光参数能够提升胶接强度,并且离散系数较小;但不合适的激光处理参数反而会降低胶接强度。激光处理后最大剪切强度为22.575 MPa,相比于不处理提升27.1%,对应离散系数为2.7%。

Adhesive bonding is one of the main methods of connecting composite structures, and the surface treatment has a significant impact on the bonding performance. In this paper, ultraviolet laser is used to treat the bonding surface of cyanate ester resin-based composites, and the influence of laser parameters on surface morphology and bonding performance is studied. The numerical simulation results show that the laser heat-affected zone is small, and according to the temperature of fiber and resin and their respective vaporization temperatures, it can be seen that laser treatment is mainly surface resin ablation. Through the observation of the surface state after the treatment, it is found that when laser ablates the cyanate ester resin, carbon black is formed due to the incomplete decomposition of the resin. The results of the single lap tensile shear test show that laser treatment with appropriate laser parameters can increase the bonding strength, and the dispersion is relatively small. But laser treatment with inappropriate laser parameters will reduce the bonding strength. The maximum shear strength after laser treatment is 22.575 MPa, which is 27.1% higher than that of the untreated group. And the dispersion coefficient is 2.7%.