软模辅助RTM成型舱段构件及其性能研究

某些复合材料结构件尺寸较大且内部结构复杂,难以通过传统RTM工艺一次整体成型,并且因其成型压力低而致纤维含量不高,成型构件力学性能不佳.本研究用硅橡胶来浇铸成型特定形状的软模,采用软模辅助RTM来制备舱段构件这一典型航天结构件.由于硅橡胶软模在复合材料固化成型过程中发挥了设计中的膨胀挤胶作用,复合材料的纤维体积含量和力学性能得到了显著提高,舱段整体力学性能满足了航天主承力结构件的使用要求,因此软模辅助RTM在制备具有内部复杂结构的装备结构件上具有广阔的发展前途.

Fabrication of the Cabin Component by Flexible-mould Assisted RTM Process and Its Performance

Some equipment components with large size and complicated internal structures were difficult to be manufactured integrally in one time by traditional RTM process. These components fabricated by traditional RTM had poor mechanical properties because the fiber volume fraction was verysmall. In this paper the complicated flexible-mould was fabricated with silicone rubber. The siliconerubber mould was used to assist RTM to manufacture the cabin component. The surplus resin weresqueezed out when the flexible-mould expanded by heating, therefore the fiber volume content of the composites reached 57% and the mechanical performance of the composites improved much. Thestatic mechanical properties of the cabin satisfied the requirements of the primary load bearing structure in aerospace, so the flexible-mould assisted RTM process that was suitable to manufacture thecomponents with complicated inner shape was prosperous in fabricating equipment components.