炭纤维／环氧树脂复合材料层板连续激光烧蚀数值计算

应用工程软件ANSYS的参数化设计语言(APDL)编制程序,建立了复合材料瞬态温度场和烧蚀的物理数学模型,利用"杀死"单元的方法实现动边界退移的烧蚀与热传导耦合计算,从而完成了对烧蚀尺寸变化的定量描述;采用AN-SYS中处理相变的方法,通过定义材料随温度变化的焓来考虑潜热。考虑了纤维的烧蚀、树脂分解以及辐射和对流热损失,对炭纤维/环氧叠层复合材料在不同辐射时间下激光烧蚀的温度场和烧蚀率进行数值计算,并分析了烧蚀特性和烧蚀机理,计算结果与实验结果吻合较好,可为复合材料热载荷下的失效分析和抗激光加固技术设计提供理论基础。

Numerical calculation for ablation of carbon fiber/epoxy resin laminated composites under continuous laser irradiation

The parameterization design language APDL of the engineering software ANSYS was used to compile programs to derive transient temperature distribution and the ablation physical-mathematical model of the composites.The killing element method was used for the interface regressive ablation and thermal conduction coupling calculation,therefore the ablation dimension can be described quantitatively.The phase-change method of ANSYS was used to simulate latent heat by defining the enthalpy of the composite,which changes with temperature.The effects of fiber ablation,resin decomposition,radiation and convection heat loss were taken into consideration,then the temperature distribution and ablation rate of the carbon fiber/epoxy laminated composite under different irradiation time were numerically calculated.The ablation characteristics and mechanism were analyzed,and the calculation results agree well with experimental results,which can provide the basis for failure analysis of the composite and reinforcement technique under laser irradiation.