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针对树脂基复合材料层板热压罐成型工艺,采用薄膜压力传感器建立了密实压力在线测试系统,用于监测成型过程中复合材料所受密实压力的大小和分布。研究了密实压力测试系统在热压罐工艺条件下的适用性,在此基础上以该系统为测试手段,研究了热压罐工艺下L形碳纤维/环氧树脂复合材料层板的密实压力变化规律及模具形式的影响。结果表明:所建立的密实压力测试系统具有较高的准确性和动态响应性,能够测试高温条件及曲面位置的密实压力,满足复合材料热压罐成型过程中密实压力的在线测试要求;L形复合材料层板成型过程中拐角区与平板区的密实压力随热压罐压力增大而增加,但增加速度和最终大小不同,阳模成型时拐角区密实压力高于平板区,阴模成型时拐角区密实压力小于平板区和外加压力,表明曲面结构与平板结构的密实行为具有差异性。
Aiming at the molding process of resin-based composite autoclave, a compact pressure on-line test system was established by using film pressure sensor to monitor the density and distribution of the compacted material under pressure during the forming process. The applicability of the compact pressure test system under autoclave process was studied. Based on this system, the system was used as the test method to study the change of solid pressure of L-shaped carbon fiber / epoxy composite laminates under autoclave process Law and the impact of mold form. The results show that the established compact pressure test system has high accuracy and dynamic response, can test the dense pressure at high temperature and curved surface to meet the on-line testing requirements of dense pressure in the process of forming autoclave. L-shaped During the forming process of composite laminates, the solid pressure in corner area and flat area increased with the increase of autoclave pressure, but the increasing speed and the final size were different. The solid pressure in corner area was higher than that in flat area. The solid pressure in the corner area is less than that in the slab area and the applied pressure, indicating that there is a difference in the compact behavior between the surface structure and the slab structure.