Mishra Rajesh Kumar, Petru Michal, Behera Bijoya Kumar, Behera Promoda Kumar
Department of Material Science and Manufacturing Technology, Faculty of Engineering, Czech University of Life Sciences Prague, Kamycka 129, 16500 Prague, Czech Republic.
Department of Machinery Construction, Faculty of Mechanical Engineering, Technical University of Liberec, Studentska 1402/2, 46117 Liberec, Czech Republic.
Polymers (Basel). 2022 Mar 11;14(6):1134. doi: 10.3390/polym14061134.
This work presents the manufacture of polymer composites using 3D woven structures (orthogonal, angle interlock and warp interlock) with glass multifilament tows and epoxy as the resin. The mechanical properties were analyzed by varying the processing parameters, namely, add-on percentage, amount of hardener, curing time, curing temperature and molding pressure, at four different levels during the composite fabrication for three different 3D woven structures. The mechanical properties of composites are affected by resin infusion or resin impregnation. Resin infusion depends on many processing conditions (temperature, pressure, viscosity and molding time), the structure of the reinforcement and the compatibility of the resin with the reinforcement. The samples were tested for tensile strength, tensile modulus, impact resistance and flexural strength. Optimal process parameters were identified for different 3D-woven-structure-based composites for obtaining optimal results for tensile strength, tensile modulus, impact resistance and flexural strength. The tensile strength, elongation at break and tensile modulus were found to be at a maximum for the angle interlock structure among the various 3D woven composites. A composition of 55% matrix (including 12% of hardener added) and 45% fiber were found to be optimal for the tensile and impact performance of 3D woven glass-epoxy composites. A curing temperature of about 140 °C seemed to be optimal for glass-epoxy composites. Increasing the molding pressure up to 12 bar helped with better penetration of the resin, resulting in higher tensile strength, modulus and impact performance. The optimal conditions for the best flexural performance in 3D woven glass-epoxy composites were 12% hardener, 140 °C curing temperature, 900 s curing time and 12 bar molding pressure.
这项工作展示了使用三维编织结构（正交、角联锁和经联锁）、玻璃复丝束和环氧树脂作为树脂来制造聚合物复合材料的过程。通过在三种不同三维编织结构的复合材料制造过程中，在四个不同水平上改变加工参数，即附加百分比、固化剂用量、固化时间、固化温度和成型压力，来分析其力学性能。复合材料的力学性能受树脂灌注或树脂浸渍的影响。树脂灌注取决于许多加工条件（温度、压力、粘度和成型时间）、增强材料的结构以及树脂与增强材料的相容性。对样品进行了拉伸强度、拉伸模量、抗冲击性和弯曲强度测试。针对不同的基于三维编织结构的复合材料确定了最佳工艺参数，以获得拉伸强度、拉伸模量、抗冲击性和弯曲强度的最佳结果。在各种三维编织复合材料中，角联锁结构的拉伸强度、断裂伸长率和拉伸模量最高。发现55%的基体（包括添加的12%固化剂）和45%的纤维组成对于三维编织玻璃 - 环氧复合材料的拉伸和冲击性能是最佳的。约140°C的固化温度似乎对玻璃 - 环氧复合材料是最佳的。将成型压力提高到12巴有助于树脂更好地渗透，从而提高拉伸强度、模量和冲击性能。三维编织玻璃 - 环氧复合材料中获得最佳弯曲性能的最佳条件是12%的固化剂、140°C的固化温度、900秒的固化时间和12巴的成型压力。
