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根据复合材料三维黏弹性本构关系,建立了纤维增强复合材料层板高速倾斜冲击损伤的数值分析模型。该模型在复合材料层间引入界面单元模拟层间分层,结合三维Hashin失效准则进行单层板面内损伤识别,引入材料刚度折减方案,采用非线性有限元方法,研究高速倾斜冲击下复合材料层板的破坏过程和损伤特性。研究结果表明:层板的主要损伤形式是层间分层、基体微裂纹和纤维断裂;冲击速度不变而入射角度增大时,剩余速度减小,层板损伤面积在一定入射角度范围内有明显变化;入射角度不变而冲击速度增大时,剩余速度增大,层板损伤面积在一定速度范围内也有明显变化。
According to the three-dimensional viscoelastic constitutive relationship of composite materials, a numerical analysis model of high-speed oblique impact damage of fiber-reinforced composite laminates is established. This model introduces interlaminar interface layer delamination between composite layers and combines with three-dimensional Hashin failure criteria to identify single-layer intraplate surface damage. The material stiffness reduction scheme is introduced and the nonlinear finite element method is used to study the composite under high-speed inclined impact Failure of material laminates and damage characteristics. The results show that the main damage forms of the laminates are layer delamination, matrix microcracks and fiber fractures. When the impact velocity is constant and the incident angle increases, the residual velocity decreases, and the damage area of the lamina is within the range of incident angle Obviously changing. When the incident angle is constant and the impact velocity increases, the residual velocity increases, and the damage area of the laminates also changes obviously within a certain speed range.