Numerical Simulation Of Laser Damage Effect On Composite Targets

At present,the main components of the target of laser weapon are cylindrical shell structure.The working load in boost phase are complex,mainly includes inertia overload,internal pressure of engine and high temperature load when engine working,and it also bears the aerodynamic load introduced by the surrounding flow field.Therefore,the damage of the laser to the target of the boost phase of the composite includes a very complex physical field coupling effect.Because the working environment of laser weapon's target is very abominable,the requirement for materials is more stringent.Carbon fiber epoxy resin material,its specific strength and specific modulus are the highest in the existing structural materials,Carbon fiber composites have great advantages in areas with strict requirements for density,stiffness,weight and fatigue properties.Some laser weapons' target have already use the material in their main components.Accordingly,we divide it into two kinds of damage modes,which are thermal-mechanical coupling effect of target induced by laser irradiation and laser ablation damage.For the two kinds of damage effect,typical targets are chosen and some research work is carried out:Based on the constitutive relation of typical structures in classical mechanics,the constitutive relation of anisotropic materials is derived.The failure analysis of linear buckling of composite cylindrical shells under axial load,the formula for solving the critical buckling load of composite laminated shell subjected to buckling of axial pressure buckling is obtained by analytical method,and the solution of the formula is given.Study on the effect on the thermal-mechanical coupling damage caused by laser irradiation.Firstly,First,get the threshold of buckling of composite cylindrical shells under axial compression by theoretical calculation.Then,the eigenvalue buckling of composite cylindrical shells is numerically simulated by ABAQUS,The first order mode is extracted and the eigenmode mapping is used as the initial defect of the cylindrical shell,and the static nonlinear buckling analysis is carried out.Finally,the thermal-mechanical coupling effect of cylindrical shell irradiated by laser is simulated by ABAQUS software.The effect of critical buckling load of composite cylindrical shells irradiated by laser is obtained,and the effect of relevant parameters on critical buckling load and buckling mode is also obtained.Study on the effect of laser irradiation on target ablation and damage.The damage effect of laser on composites is very complex.This paper only considers the thermal decomposition and oxidation reaction.Using the ALE adaptive grid method,the UMESHMOTION subroutine for controling ablative is written through two development of ABAQUS.The three-dimensional ablation process of a carbon fiber composite cylindrical shell was simulated and the influence of the related parameters on the critical buckling load was obtained.Through the heat conduction equation and the thermoelastic statics equation,the similar parameters of the model are discussed and studied.The similarity criterion is obtained for cylindrical shell subjected to coupling multiple loads or individual load.The similarity criteria are evaluated and analyzed according to the similar criteria that need to be followed.