Effects Of Laser Irradiation To Carbon Fiber Reinforced Epoxy Resin Composites

Researches into responses of fiber reinforced plastic (CFRP) subjected to laser beam is presented in this paper.First, in the laser irradiation experiments, ablation mechanics are researched by observing experiments phenomenon as well as measuring related parameters. Ablation of carbon fiber reinforced epoxy resin composite specimens become serious with the increase of pulse laser's power density. At the beginning, the epoxy resin decomposes, then, ablation of carbon fibers are observed. The specimens are burnt through by laser beams in some occasions. Comparison between high frequency laser and low one reveals that, even with the same energy density, the former one produces more serious ablation to composites specimens.Then, one-dimensional ablation model is built with compute programme compiled in order to simulate ablation damages. Results from calculation and references agree well. Simulation of several groups of composites exposed to laser beams with different parameters indicates that, even with the same energy density, high frequency laser irradiation is prone to decompose the resin, which leads to a lower temperature rise in back surface.As to thermal stress damage, thermal pattern and thermal stress of composites subjected to low power density laser beams are calculated based on ANSYS. The characters of their distribution due to anisotropy are analyzed at last.