雷击冲击力作用下复合材料层合板动力学响应及损伤特性

摘要

Using the constructed three-dimensional progressive damage degradation model for composite based on the theory of continuum damage mechanics(CDM),dynamic response and damage performance of composite lami-nate under the act of lightning strike impact force were analyzed through the platform of ABAQUS software and VUMAT subroutine.Analysis results indicate that under the act of lightning strike impact force,laminate displays oscillatory movement with amplitude decrease,and the work did by lightning strike impact force converts with inter-nal energy and kinetic energy of laminate mutually,and accompanys with the consumed viscous dissipation energy, additionally,it can be expressed as a function of electrical charge and action integral of lightning current.Mechanical impact damage degree of laminate depends on the work due to lightning strike impact force,for the same material, matrix,fiber and delamination damage exist different corresponding critical damage external energy,respectively. When the work did by lightning strike impact force higher than the critical damage energy,laminate will occur corre-sponding damage form.With the same boundary support condition,the maximum value of fiber,matrix and delami-nation damage state variables depend on total work did by lightning strike impact force,and have nothing to do with lightning current parameters.%采用基于连续介质损伤理论(CDM)的复合材料三维渐进损伤分析模型,以 ABAQUS有限元分析软件为平台,结合VUMAT子程序,对雷击冲击力作用下的复合材料层合板进行了三维动力学分析,研究了雷击冲击力作用下层合板的动力学响应及损伤特性.结果表明,在雷击冲击力作用下,层合板做降幅振荡运动,冲击力做功与层合板内能和动能相互转换,同时伴随着黏性耗散能,冲击力做功大小可用雷电流库伦量与作用积分的函数表示;层合板损伤由外力做功大小决定,对于同种材料,基体、纤维及分层损伤分别存在不同的损伤能量临界值,当冲击力做功大于该值,层合板会产生对应的损伤;在相同边界支持条件下,冲击力总功最大值决定了不同损伤类型损伤状态变量的大小,与波形参数和峰值电流无关.