基于ABAQUS的CCF300碳纤维层合板低速冲击破坏数值模拟

Numerical Simulation of Low Velocity Impact Failure of CCF300 Carbon Fiber Laminate Based on ABAQUS

为了更有效预测国产碳纤维增强材料在冲击载荷下的损伤情况,以国产碳纤维(CCF300)/环氧树脂(5228)复合材料层合板为对象,利用专业有限元仿真软件ABAQUS进行冲击破坏性能数值模拟研究。采用复合材料渐进损伤法,建立CCF300碳纤维层合板在低速冲击载荷下的损伤和变形三维有限元模型。通过三维实体单元模拟层合板,利用内聚力接触模拟单层板间的接触,从而模拟层合板层内和层间的不同失效模式。使用FORTRAN语言编写ABAQUS材料用户子程序VUMAT实现模拟,程序中包含本构方程的求解、损伤准则对单元失效的判定和损伤单元参数退化3部分,材料的单元失效是通过引入状态损伤变量来判断。仿真模型可通过调用子程序来模拟复合材料的纤维拉伸、压缩失效、基体开裂、挤压失效4种层内损伤,同时ABAQUS本身可以模拟材料分层损伤。通过仿真得到了材料的最大冲击破坏载荷和损伤模式的效果图。

In order to more effectively study and predict the damage of domestic carbon fiber reinforced materials under impact load, this paper took the domestic carbon fiber （CCF300） / epoxy resin （5228） composite laminates as the object, the professional finite element simulation software ABAQUS was used for impact damage simulation. Based on the analysis of progressive damage, a three-dimensional finite element model of damage and deformation for composite laminates under low velocity impact was established. Being applied to three dimensional solid elements and cohesive elements,the model could simulate the different failure modes of intralaminar and interlaminar damage for composite laminates. The numerical analysis was mainly carried out by using the user subroutine （VUMAT） of finite element software ABAQUS which included three parts ： the solution of constitutive equation, the damage criterion to the failure of the element and material degradation of damage element. In the process of the simulation model could call the subroutine to simulate fiber tensile failure, fiber compress failure, matrix crushing and matrix cracking and the ABAQUS could simulate the delamination damage by itself. Finally, the maximum impact strength and damage pattern of the material were obtained by simulation.