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建立了描述厚截面复合材料固化压实过程的三维有限元模型并进行了模型有效性验证,计算了400层AS4/3501-6层合板在固化过程中的温度场、固化度、粘性、树脂体积含量和厚度压缩率情况.模型计算结果表明:在固化过程中,层合板的中间层会出现高于保温平台约49 K的温度峰值;层合板沿厚度方向的温度和固化度的非同步现象明显;层合板的中部存在明显的局部温度过热和快速固化区域,该区域内的树脂粘性变化剧烈、树脂流动时间缩短,阻碍了该区域及层合板下部的多余树脂流入吸胶膜,并最终导致了固化结束后树脂的不均匀分布,靠近吸胶膜的上表面树脂体积含量约为41%,靠近模具的下表面约为46.5%;层合板的最终固化压实率在15.7%左右.
A three-dimensional finite element model describing solidification compaction process of thick section composite was established and validated by model validation. The temperature field, curing degree, viscosity, resin volume Content and thickness of the laminate.The results of the model calculation show that during the curing process, the intermediate layer of the laminate will have a peak temperature about 49 K higher than that of the insulation platform. The non-synchronous phenomenon of the temperature and the degree of solidification of the laminate in the thickness direction is obvious ; There was a clear local overheating and rapid curing area in the middle of the laminate where the resin viscosity changed drastically and the resin flow time was shortened to prevent excess resin from flowing into the adhesive film in this area and the lower part of the laminate and eventually After curing, the resin is unevenly distributed. The volume of the resin near the upper surface of the gummed film is about 41%, and the lower surface near the mold is about 46.5%. The final solidified compaction rate of the laminate is about 15.7%.