单脉冲平顶激光清洗CFRP的多物理场特性研究

Research on multi physics field characteristics of the single pulse top hat laser cleaning CFRP

为探究平顶激光清洗碳纤维增强复合材料(CFRP)的作用机制,本研究考虑CFRP的组分对激光的吸收、反射特性差异显著,将激光载荷分层施加到CFRP的细观有限元模型上,引入热烧蚀-热应力双重作用效果,还原不同能量密度下单脉冲平顶激光清洗形貌,并完成了试验验证。结果表明:分层施加激光载荷较传统表面加载模式能够有效提升仿真精度,采用热烧蚀-热应力双重判据能够进一步提升形貌还原效果,本研究模型的仿真形貌长轴贴合度不低于96.64%,面积贴合度达到80.00%,并通过高精度模型瞬时温度场分布能够指导激光清洗CFRP表面树脂的实际工艺。

In order toinvestigate the mechanism of top hat laser cleaning of carbon fiber reinforced composite(CFRP),considering the significant differences in the absorption and reflection characteristics of the components of CFRP,the laser load is layered to the meso finite element model of CFRP.The dual effect of thermal ablation and thermal stress is introduced to restore the morphology of single pulse flat top laser cleaning at different energy densities,and to complete the experimental validation.The results show that the layered application of laser load can effectively improve the simulation accuracy compared with the traditional surface loading mode,and the dual criterion of thermal ablation thermal stress can further improve the morphology reduction effect.The long axis accuracy of the simulated topography of this model is not less than 96.64%,and the area accuracy reaches 80.00%.Therefore,the instantaneous temperature field distribution of high precision models can guide the actual process of laser cleaning of CFRP surface resin.