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首页> 外文期刊>International Journal of Solids and Structures >Nonlinear viscoelastic multi-scale repetitive unit cell model of 3D woven composites with damage evolution
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Nonlinear viscoelastic multi-scale repetitive unit cell model of 3D woven composites with damage evolution

机译：具有损伤演化的3D编织复合材料非线性粘弹性多尺度重复晶胞模型

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Three-dimensional (3D) textile composites have great potential applications to aircrafts and high speed vehicles because of the high strength/weight ratios and the capabilities of manufacturing complex, net-shape preforms. This paper reports the nonlinear viscoelastic responses and damage mechanisms of one kind of 3D textile composites, named as 3D orthogonal woven composite (3DOWC) under quasi-static tensile loading based on a micro/meso-scale repetitive unit cells (RUCs) model. In the RUCs model, the resin is described with a nonlinear viscoelastic material and the fibers/tows with an elastic material. The damage initiation and propagation in resin are simulated by the post-damage constitutive models with maximum principal theory failure criteria. The fibers/tows impregnated with resin are defined by elastic transverse-isotropic material model with ultimate strengths failure of 'expanded smeared crack' both along and perpendicular to fibers/tows axis direction. The engineering parameters and ultimate strengths of homogenized fibers/tows filled with matrix in meso-RUCs model are transferred from the numerical analysis of the micro-RUCs. The results are compared with experimental and theoretical values of RUC deformation and damage initiation and propagation under monotonic axial loading. The methodology of establishing the nonlinear visco-elastic multi-scale model of 3D textile composites without introducing the real fabric architecture in finite element analyses is explained. With the multi-scale RUCs model, the mechanical behaviors of other kinds of 3D textile composites can also be predicted.
机译：三维（3D）纺织复合材料具有很高的强度/重量比和制造复杂的净形瓶坯的能力，因此在飞机和高速飞行器中具有巨大的潜在应用。本文报告了一种基于微观/中尺度重复单元细胞（RUCs）模型的准静态拉伸载荷下3D正交编织复合材料（3DOWC）的3D纺织品复合材料的非线性粘弹性响应和损伤机理。在RUCs模型中，树脂是用非线性粘弹性材料描述的，而纤维/丝束是用弹性材料描述的。破坏后的本构模型以最大的基本理论破坏准则模拟了树脂中的损伤萌生和传播。树脂浸渍的纤维/丝束是由弹性横观各向同性材料模型定义的，其最终强度沿“纤维丝束/丝束”轴方向和垂直方向均会出现“扩展的涂抹裂纹”。从微观RUCs的数值分析中，传递了均质RUCs模型中填充有基质的均质纤维/丝束的工程参数和极限强度。将结果与单调轴向载荷下RUC变形以及损伤的萌生和扩展的实验和理论值进行了比较。解释了在有限元分析中不引入真实织物结构的情况下建立3D纺织品复合材料非线性粘弹性多尺度模型的方法。使用多尺度RUCs模型，还可以预测其他类型的3D纺织品复合材料的力学行为。

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