拉伸载荷下含孔复合材料层合板的力学性能及失效机理

摘要

In order to set up a three dimensional damage model for composite laminates with a circular hole,based on the failure criteria proposed by Linde et al.,we at first implemented the user-defined material subroutine UMAT in the finite element code ABAQUS using the factors of fiber and matrix to characterize the gradual degradation of material.Then we used the damage model to study the mechanical property and failure mechanism of composite laminates with different ply angels,stacking sequences,hole diameters or positions subjected to uniaxial tension.The results show that the damage factors of the fiber and matrix varied differently for plies with different ply angels.In addition,the hole diameter and ply angle have significant effects on the reaction force of the composite laminates,while the influence of the hole position and stacking sequence of plies are much smaller.Our model can be used to predict qualitatively and quantitatively the progressive failure behavior of composite laminates under tension,thus it can serve as a reference for engineering application and design of composite laminates.%采用有限元软件ABAQUS,基于前人提出的失效准则,通过引入纤维损伤因子和基体损伤因子并编制用户材料子程序UMAT,建立了含孔复合材料层合板的三维渐进损伤破坏模型.利用该损伤破坏模型,研究了在轴向拉伸载荷作用下不同圆孔直径和铺层角度的复合材料层合板的纤维和基体的渐进损伤失效过程及规律.结果表明:不同铺层角度条件下,纤维和基体的损伤失效差别较大;圆孔直径和铺设角度对含孔复合材料层合板的失效破坏载荷的影响十分显著,而铺设顺序和开孔位置对失效破坏载荷的影响较小.建立的失效破坏模型能有效地分析层合板的渐进失效破坏过程,为层合板的工程应用和设计提供有益的参考.