温度制度对纤维增强复合材料挖补修复过程的温度场影响

Effect of Cure Cycle on Temperature Field of Fiber Reinforced Composites During Scarf Repair

借助有限元模拟仿真的方法,开展纤维增强复合材料结构在挖补修复过程的补丁固化行为研究。基于材料的温变特性,建立了复合材料结构挖补修复的补丁固化模型,探讨了升温速率和保温时间对挖补修复过程的温度场影响。结果表明,相比于保温时间,升温速率对补丁的固化行为影响更大;在升温速率增大一倍后,补丁固化中心点的温度峰值增加1.1%;温度变化速率和固化反应速率均随升温速率的提高而增加,固化区域产生明显的温度梯度;在本研究中,修复区域的最大温差高达8℃。

The patch curing behavior of fiber reinforced composite structures during scarf repair was studied via finite element simulation. A patch curing model of scarf repaired composite structures was established based on the temperature-dependent material parameters. The effect of heating rate and hold time on the temperature field in scarf repair was discussed. The results show that the influence of heating rate on the curing behavior of scarf repair is greater than that of hold time. When the heating rate increased one time,the curing temperature peak of the center increases by 1. 1%. Moreover,the temperature change rate and curing reaction rate increase as the heating rate increases with an obvious temperature gradient generated in the curing area. In this work,the maximum temperature difference in the repaired area is up to 8℃.