树脂基复合材料在连续激光作用下的损伤

Damage analysis of fiber reinforced resin matrix composites irradiated by CW laser

采用热压工艺制备了碳纤维布和高硅氧纤维布增强的环氧树脂和酚醛树脂基复合材料，研究了不同功率密度连续激光辐照下，复合材料的破坏形式及其组织结构与力学性能的变化。结果表明：当激光辐照功率密度大于0．1kW／cm^2后，树脂基体产生燃烧，碳纤维没有明显的损伤，而玻璃纤维布开始熔融，复合材料的拉伸性能降低30％～40％；当功率密度达到1kW／cm^2以后，除基体燃烧外，碳纤维复合材料产生明显的鼓泡分层，表层碳纤维有少量破断，而高硅氧纤维产生明显的熔融烧损，复合材料的拉伸性能降低80％以上。采用有限元计算方法，对碳纤维增强环氧树脂复合材料在连续激光辐照下的温度场进行了研究，计算结果与实验中复合材料的损伤行为相吻合。

In this paper, the damage modes of the carbon fiber and the glass fiber reinforced epoxy or bakelite resin matrix composites irradiated by CW laser under different power densities were analyzed, and the changes of the microstructure and the tensile strength of the composites were also researched. When the resin matrix composites were radiated at a power density more than 0. 1 kW/cm^2, the matrix would be decomposed and the tensile properties of the radiated samples were lost over 30% while the carbon fiber hardly damaged and the glass fiber melted. When the power density of the laser was raised to 1 kW/cm^2 , the matrix burned violently and the carbon fiber cloth began to split with some carbon fiber being fractured, therefore, the fracture strength of the radiated sample lost over 80 %. The higher the power density of radiation was, the more serious the damage of the sample was. It was also found that the difference of the matrixes had little effect on the damage extent of the composites. The influence of the radiation density on the temperature of the radiated surface of the carbon/resin composite was numerically calculated by ANSYS finite element software and the calculation results coincided with the damage mode of the radiated composites.