维尼纶纤维增强石膏基复合材料力学性能研究

研究了石膏基复合材料的结构、耐水机理和物理力学性能.结合弯曲载荷变形曲线,分析了维尼纶纤维增强石膏基复合材料的断裂机理;利用扫描电子显微镜,分析了复合材料界面性能.结果表明:石膏基复合材料实现了单一的结晶到晶胶共生的结构转变,材料的强度和耐水性得到改善;维尼纶纤维能提高复合材料的抗折强度、断裂能、断裂韧性和冲击韧度;维尼纶纤维增强石膏基复合材料断裂过程可分为3个阶段:基体断裂、纤维脱粘和纤维拔出;纤维和基体间界面结合强度较弱.

Research on Mechanics Performance of Vinylon Fibre Reinforced Gypsum-Based Composite Material

The structure,water-resistant mechanism and physical mechanics properties of the gypsum based composite material(GBCM) were studied.The fracture mechanism of the fibre reinforced GBCM was analyzed by the curve of load-deform.The interfacial properties between fibre and matrix material were analyzed utilizing the scanning electron microscopy(SEM).The results show that the structure of GBCM is changed from the single crystallization to the crystallization gel.The strength and water resistance are improved greatly.Vinylon fibre can improve the bending strength,fracture energy,fracture toughness and impact toughness. The fracture mechanism can be divided into three stages: matrix material fracture,fibers disengagement,and fibres pull out.There exist the weak interfaces bonding strength between the vinylon fibres and matrix material.