泡沫夹层结构复合材料热膨胀模压法工艺研究

在传统泡沫夹层结构复合材料成型工艺基础上,探索了一种新型的夹层结构成型工艺。传统工艺需要热压罐、真空袋等外部设备来为成型提供压力,文中提出了利用泡沫本身热膨胀和刚性模具的限制作用,为泡沫夹层结构复合材料提供成型压力。通过对泡沫芯材的模压发泡工艺的控制、监测,分析了夹层结构成型时内部产生压力的大小。同时,对其弯曲强度和剥离强度进行了表征。实验结果表明:控制芯材密度、发泡温度和发泡时间能有效地提高夹层结构的成型压力和力学性能。

Processing of Foam Core Sandwich Structures by Thermal Expansion Molding

Based on conventional manufacture methods a new manufacturing process of foam core sandwich structure composites is studied.Conventional curing pressure is provided by external equipments,such as autoclave,vacuum bag and so on.In this paper,the foam core composite sandwich structures are manufactured inside a mould with the pressure generated by the thermal expansion of the foam and the stiff mould.The pressure generated inside the mold is analyzed and measured when the manufacture of the foam core is controlled.Additionally,the flexural and the peel strengths also are tested.Results show that the controlled density,temperature and time of foam core manufacturing can improve the pressure and mechanical properties in the processing of the foam core sandwich.