本文借鉴金属零件热校形工艺的经验,利用复合材料在高温下的应力松弛现象,通过热校形工艺修正复合材料零件的形状.制造了碳纤维平纹织物/环氧复合材料L形梁、C形梁,通过自制的热校形模具,以实验方法研究热校形时间、热校形载荷对零件形状的影响,分析复合材料热校形工艺的可行性.研究表明,复合材料热校形工艺中零件变形的主要原因是零件在高温下发生应力松弛,其他因素可以忽略;热校形载荷、热校形时间都对热校形工艺的效果有重要影响.针对特定的复合材料结构,采用合理的热校形工艺过程能够有效地控制构件形状,方便零件的装配.
Based on the experience of hot sizing process for metals,the high-temperature stress relaxation phenomenon of composites was utilized to rectify the profile of composite structures using the hot sizing process.L shaped and C-shaped beams made of carbon fiber fabric/epoxy were manufactured.The hot sizing experiments were carried out using the homemade hot sizing tools to investigate the effect of hot sizing load and hot sizing period on the shape of the part.The feasibility of the hot sizing process for carbon fiber fabric/epoxy composite structures was also analyzed.It is found that the stress relaxation under high temperature is the major factor to induce deformation of the composite structure in the hot sizing process,and other factors can be neglected.Both hot sizing load and hot sizing period have great influences on the result of the hot sizing process.As for a certain composite structure,an appropriate hot sizing process can effectively control the shape of the structure and make the assembly of the part more convenient.
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