基于组合芯模维形传压的复合材料帽型加筋构件固化过程压力分布及成型质量

Pressure distribution and forming quality of composite hat-stiffened structures during curing process based on combined mandrel pressurization method

为改善硅橡胶芯模辅助成型中调型孔工艺窗口过窄,导致复合材料帽型件成型质量对其敏感性过高问题,提出硅橡胶芯模&真空袋气囊组合新方法,并对不同调型孔硅橡胶芯模&真空袋气囊下成型的复合材料帽型件固化过程中压力分布和固化后成型精度、微观结构与力学性能进行了研究。结果表明:未开设调型孔&真空袋气囊,构件内部压力大小波动明显且不均分布,随着孔占比XS的增大,在XS=0.40~0.53内,构件内部压力均匀且稳定在所需压力0.6 MPa,同时,构件厚度和型腔高度平均差值仅为0.046 mm和0.40 mm,其三角区域微观结构质量较高,平均拉脱性能和增幅分别为3.42 MPa和23.02%。本文提出的方法具有更宽的调型孔工艺窗口,在复合材料帽型件固化成型领域具备一定应用潜力。

In order to improve the problem that the process window for the size of the silicone rubber mandrel was too narrow,which led to the high sensitivity of the forming quality of the composite hat-stiffened structure,a novel mandrel pressurization method combining silicon rubber mandrel and vacuum bag airbag was proposed,and the pressure distributions in the co-curing process and the forming accuracy,microstructure and mechanical properties of the composite hat-stiffened structures formed under the combined mandrel with different adjustable apertures were studied.The results show that the internal pressure fluctuates obviously and unevenly without the opening of adjustable aperture.With the increase of aperture proportion XS,the internal pressure is uniform and stable at the required pressure of 0.6 MPa within XS=0.40-0.53.At the same time,the average differences between the component thickness and the cavity height areonly 0.046 mm and 0.40 mm.The microstructure quality of the triangular area is high,and the average pull-off performance and increase rate are 3.42 MPa and 23.02%respectively.The method proposed in this study has a wider process window of adjustable aperture,which has a certain application potential in the forming manufacturing of composite hat-stiffened structures.