Compacting pressure measuring method in autoclave processing of polymer composites using film sensor
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摘要: 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。Abstract: For autoclave processing of polymer composite laminates, a compacting pressure on-line measuring system using film pressure sensor was established to monitor the value and distribution of compacting pressure on composites during processing. The applicability of the compacting pressure measuring system in autoclave processing was studied. The variation of compacting pressure in autoclave processing for L-shaped carbon fiber/epoxy laminates and the effects of mold configurations were investigated using the measuring system. The results show that the measuring system is accurate and is good in dynamic response. It can be used in high temperature and measure the compacting pressure on curved surfaces. These properties meet the requirements of compacting pressure on-line measuring for composites in autoclave processing. The compacting pressures at the corner and in the flat section for L-shaped composite laminates increase with the autoclave pressure during fabrication, but their increasing speeds and the final values are different. The compacting pressure at the corner is larger than that in the flat section during convex tool molding, while the compacting pressure at the corner is less than that in the flat section and the external pressure during concave tool molding. These experimental results demonstrate that the compacting behavior in curved part is different from that in flat structure.
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