RTM复合材料的增韧技术研究

RESEARCH ON TOUGHENING METHODS OF RTM COMPOSITIES

本体增韧和"离位"增韧是提高复合材料韧性的主要增韧技术,在RTM复合材料中也有大量应用。本文分别对EH301树脂进行本体增韧和"离位"增韧设计,并对改性前后树脂及其复合材料的流变特性、耐热性、冲击后压缩强度和其他力学性能进行分析,对比两种增韧技术在RTM复合材料中应用的优缺点。同时,结合扫描电子显微镜(SEM)观察PA毡的定型状态,研究定型工艺对复合材料力学性能的改善效果。结果表明:相比于本体增韧,"离位"增韧技术工艺性好,增韧效果显著,更适用于RTM复合材料体系的增韧,缺点是会降低复合材料的压缩强度和层间剪切强度。通过提高定型工艺时间和温度,改善PA毡与树脂的界面结合力,能够降低这种负面影响。

In-situ and Ex-situ are the main toughening methods to improve the toughness of composites, which are also widely used in RTM composite. This paper concentrates on In-situ and Ex-situ toughening design for EH301 resin, comparing the advantages and disadvantages of two toughening methods used in RTM composite by analyzing manufacturability, thermal properties, CAI and other mechanical properties. Meanwhile, the improval effect of tackified process on the mechanical properties of Ex-situ toughened composite was studied with the SEM morphology of PA veil. The results show that the Ex-situ method has better processibility and remarkable toughening effect which is more suitable for toughening RTM composite. Simultaneously, the negative effect of compression strength and interlaminar shear strength caused by Ex-situ toughening can be improved by increasing the time and temperature of tackified process.