In this work, we examine the relationships between the microstructure and the mechanical properties of glass fiber–reinforced polyamide 6,6 composite materials (V_f = 54%). These materials made by thermocompression incorporate different grades of high fluidity polyamide-based polymers and two types of quasi-UD glass fiber reinforcement. One is a classic commercial fabric, while the other specially designed and manufactured incorporates weaker tex glass yarns (the spacer) to increase the planar permeability of the preform. The effects of the viscosity of the polymers and their composition on the wettability of the reinforcements were analyzed by scanning electron microscopy observations of the microstructure. The respective influences of the polymers and the spacer on the mechanical performance were determined by uniaxial tensile and compression tests in the directions parallel and transverse to the warp yarns. Not only does the spacer enhance permeability but it also improves physical and mechanical properties: tensile longitudinal Young’s modulus increased from 38.2 GPa to 42.9 GPa (13% growth), tensile strength increased from 618.9 MPa to 697 MPa (3% growth), and decrease in ultimate strain from 1.8% to 1.7% (5% reduction). The correlation of these results with the damage observed post mortem confirms those acquired from analyses of the microstructure of composites and the rheological behaviors of polymers.

在这项工作中，我们研究了玻璃纤维增​​强聚酰胺6,6复合材料的微观结构与机械性能之间的关系（V _f= 54％）。这些通过热压制成的材料结合了不同等级的高流动性聚酰胺基聚合物和两种类型的准UD玻璃纤维增​​强材料。一种是经典的商用织物，而另一种经过特殊设计和制造的织物则采用了较弱的tex玻璃丝（垫片），以提高瓶坯的平面渗透性。通过扫描电子显微镜观察微观结构，分析了聚合物的粘度及其组成对增强材料润湿性的影响。通过在平行于和横向于经纱的方向上的单轴拉伸和压缩试验来确定聚合物和间隔物对机械性能的各自影响。隔离物不仅增强了渗透性，而且还改善了物理和机械性能：拉伸纵向杨氏模量从38.2 GPa增加到42.9 GPa（增长13％），拉伸强度从618.9 MPa增加到697 MPa（增长3％），并且下降最终应变从1.8％降低到1.7％（降低5％）。这些结果与观察到的损坏之间的相关性验尸证实了那些是通过对复合材料的微观结构和聚合物的流变行为进行分析而获得的。