Composite interlaminar damage analysis based on cohesive element
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摘要: 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, 可以准确地预测复合材料 Ⅰ 型层间裂纹扩展。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, 采用显示积分方法求解, 不存在收敛性问题, 同时允许使用较粗的有限元网格。最后将该模型应用于国产碳纤维增强树脂基复合材料(CCF300/5428)双悬臂梁试验(DCB)模拟分析中, 结果表明, 此界面单元模型能够准确模拟复合材料层板 Ⅰ 型裂纹扩展, 为复合材料层间损伤分析提供了一种有效的方法。Abstract: A new type of zero-thickness cohesive element model was proposed to study the composite interlaminar damage, which could accurately predict the delamination propagation of mode Ⅰ. The model consisted of the constitutive relationship, damage criterion and damage evolvement. This cohesive model was implemented in the explicit integration scheme with the commercial finite element software ABAQUS using the user subroutine VUEL, which allowed the use of coarse meshes and did not exist the convergence problem. Finally, the model was used to predict the progress of delamination in the double cantilever beam test (DCB) of domestic carbon fiber/resin the composite (CCF300/5428). The result shows that this cohesive element is effective to analysis the delamination in the composite laminates.
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