碳纤维三向织物/TPU柔性复合材料制备及变形性能

Preparation and deformation properties of carbon fiber triaxial woven fabric/TPU flexible composites

碳纤维三向织物因其具有结构稳定、密度小和准各向同性特点,在空间展开装置具有良好应用前景。为研究碳纤维三向织物/热塑性聚氨酯(thermoplastic polyurethanes,TPU)柔性复合材料变形性能,通过热压法将TPU与碳纤维三向织物复合,结合金相显微镜与扫描电子显微镜进行观测,建立三向织物单胞模型,计算模型截面惯性矩,结果表明:纬向截面惯性矩大于经向的,三向织物纬纱方向更难变形;对碳纤维平纹织物与三向织物进行悬垂实验,结果表明:三向织物变形能力强于平纹织物,并且三向织物在悬垂时经向变形大于纬向,与模型截面惯性矩的计算结果一致;对碳纤维三向织物/TPU柔性复合材料在0°,15°和30°方向进行拉伸实验,分析3种角度不同应变阶段载荷曲线变化和极限载荷。

The carbon fiber triaxial woven fabric has good application prospects in the field of space deployment devices because of its advantages of stable structure,light density and quasi-isotropic.In order to study the deformation properties of carbon fiber triaxial woven fabric/thermoplastic polyurethanes(TPU)flexible composite,TPU and carbon fibertriaxial woven fabric were composited by hot pressing.The unit cell model of triaxial woven fabric was established by metallographic microscope and SEM.The moment of inertia of different sections was calculated by the model,the moment of inertia of the weft section is greater than that of the warp,and the triaxial woven fabric is more difficult to deform in the weft direction.Drape experiments were performed on carbon fiber plain fabric and triaxial woven fabric.The results show that the deformation ability of the triaxial woven fabric is stronger than plain fabric,and the warp direction deformation of triaxial woven fabric is greater than the weft when it is draped,which is consistent with the calculation result of the moment of inertia of the model section;triaxial woven fabric is subjected to tensile tests in the 0°,15°and 30°directions,the load curve changes and ultimate loads of the three angles are analyzed at different strain stages.