Abstract Finite element (FE) simulations are performed to investigate the effect of fiber induced anisotropy on the notch behavior in hyperelastic skin type materials. The modified anisotropic (MA) model is used to define the constitutive behavior in FE simulations through Abaqus user defined material model UMAT. A parametric study is carried out to examine the effect of fiber orientation, notch root radius and sample geometry on the stress field ahead of the notch tip. A non-dimensional parameter ξ is defined to characterize the combined effect of J energy and average anisotropic energy ϕ a n i s o - avg on the notch behavior. It is shown that fibre orientation significantly influences the stress state and J-integral at the notch. The findings of the present study will be helpful in determining optimal constitution and orientation of skin grafts at locations of high stress and complex geometries, such as corner of eyes and lips, etc.

中文翻译：

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纤维排列对各向异性软组织断裂韧性的影响

摘要 进行有限元 (FE) 模拟以研究纤维引起的各向异性对超弹性蒙皮型材料的缺口行为的影响。修改后的各向异性 (MA) 模型用于通过 Abaqus 用户定义材料模型 UMAT 定义有限元模拟中的本构行为。进行参数研究以检查纤维取向、凹槽根部半径和样品几何形状对凹槽尖端前应力场的影响。定义了一个无量纲参数 ξ 来表征 J 能量和平均各向异性能量 ϕ aniso - avg 对陷波行为的综合影响。结果表明，纤维取向显着影响缺口处的应力状态和 J 积分。