复合材料低速冲击损伤分析方法

为了研究复合材料层间损伤,建立了一种新型零厚度界面单元模型,可以准确预测复合材料低速冲击与冲击后压缩过程中的分层损伤.模型包括本构关系建立、损伤准则和损伤演化引入,并在大型商用有限元软件ABAQUS用户单元子程序VUEL中实现.层内使用三维实体单元,采用三维Hashin准则作为纤维与基体损伤的判据,并在用户子程序VUSDFLD中实现.将该模型应用于国产碳纤维增强树脂基复合材料(CCF300/5428)低速冲击与冲击后压缩的模拟分析中.结果表明:此方法能够准确预测复合材料低速冲击与冲击后压缩过程中的损伤,为复合材料低速冲击损伤分析提供了一种有效的方法.

Composite damage analysis subjected to low-velocity impact

A new type of zero-thickness cohesive element model was proposed to study the composite interlaminar damage.The delamination propagation of laminates subjected to low-velocity impact can be prediceted accurately by the model.The model consisted of constitutive relationship,damage criterion and damage evolvement.The model was implemented with the commercial finite element software ABAQUS using the user subroutine VUEL.3D solid element was used in plies and 3D Hashin damage criterion was used with VUSDFLD to predict the fiber and resin damage.Finally,the model was used to predict the progress of delamination in the impact test and compression after impact(CAI) test of domestic carbon fiber/resin composite(CCF300/5428).The result shows that this cohesive element is effective to detect delamination during impact and CAI.