| Because of high power and energy concentration,the irradiation of high-energy laser causes a series of physicochemical reactions on the surface or inside of the material and causes damage or destruction.Carbon fiber reinforced plastics(CFRP)is widely used due to its high strength,low density,high temperature resistance and other characteristics.Because the thermal conductivity and Young's modulus of carbon fiber materials are anisotropic,the laser interaction mechanism is very complex,and the analysis of temperature field and stress field is very difficult.The current researches on the interaction between the laser and the carbon fiber material focus on the temperature field of the material irradiated by the laser or the ultimate stress tensile strength when under the laser irradiation,however,there are few public reports on the thermomechanical coupling effect under laser irradiation.In addition,the thermomechanical effect research of different geometric shapes and combined with metal of the CFRP target is not only challenging,but also has important theoretical significance and application value.Considering the mechanical performance of the laser tracking system and the influence of the atmospheric environment,the spot of high-energy laser system has the characteristics of spatiotemporal motion,which has an influence on temperature rise effect of laser irradiation.The research can provide theoretical support for the battle damage assessment of the effects of high-energy laser system.This paper first derives the three-dimensional Fourier heat conduction equation in the carbon fiber laminates material based on the its physical properties,and then uses COMSOL Multiphysics for three-dimensional modeling based on the anisotropic thermal physical parameters and structural characteristics of CFRP to calculate the temperature and the stress distribution of the CFRP laminates under laser irradiation.and its thermomechanical distribution is analyzed in detail.The temperature field,stress field,and time to reach the sublimation temperature of CFRP under different powers of laser irradiations are compared.The paper also simulates and analyzes the thermomechanical effect of carbon fiber cylinder material under laser irradiation,and compares the thermal characteristics and ablation time of the carbon fiber cylinder target with an alloy steel inner cylinder.The simulation results show that the thermodynamic properties of the carbon fiber cylinder with alloy steel inner cylinder have been significantly improved.This research results have important reference value for understanding the thermomechanical law of different carbon fiber materials under laser irradiation.Based on the study of the thermomechanical coupling effect of carbon fiber laminates and cylindrical targets under laser irradiations,and considering the influence of the deviation of the high-energy laser system's tracking accuracy on the target laser spot jitter,a beam model is established for the spot with different jitter levels,this paper simulates the effect of the temperature rise of the irradiated target when the laser spot is jittering.At the same time,it is concluded that the temperature rise efficiency of the irradiation of laser,whose target is affected by the laser beam jitter radius.Finally,the irradiation efficiency of the laser under different tracking conditions on the target is summarized,which provides theoretical support for the analysis of the effect of irradiation efficiency. |
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