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首页> 外文期刊>International Journal of Solids and Structures >On the initiation and growth of kink bands in fiber composites. Part II: analysis
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On the initiation and growth of kink bands in fiber composites. Part II: analysis

机译：关于纤维复合材料中扭结带的萌生和生长。第二部分：分析

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Motivated by the experimental findings in Part I, the growth of a kink band in a uniaxial composite is investigated using two- and three-dimensional micromechanical models. The models include both a local and a global imperfection and were preloaded in compression and then sheared under displacement control. An inclined kink band initiates from the local imperfection and grows across the specimen. Similar results were obtained for pure compression loading. The simulated kink bands are quite similar to those observed experimentally; though, when J(2) plasticity is used to model the inelastic matrix, their inclination is lower than in experiments. The calculated band inclination is shown to be insensitive to many model parameters including imperfection characteristics, fiber diameter, volume fraction, and matrix yield stress. However, it is quite sensitive to the dilatancy of the matrix as demonstrated by the use of the Drucker-Prager constitutive model for the matrix. It was found that the ability of the matrix to deform in the direction transverse to the fibers plays an important role in allowing larger, more realistic kink band inclinations to be obtained. (C) 2001 Elsevier Science Ltd. All rights reserved. [References: 8]
机译：根据第一部分中的实验结果，使用二维和三维微机械模型研究了单轴复合材料中扭结带的生长。这些模型既包括局部缺陷，也包括全局缺陷，并在压缩中预加载，然后在位移控制下剪切。倾斜的扭结带从局部缺陷开始，并在整个样品上生长。对于纯压缩载荷，获得了相似的结果。模拟的扭结带与实验观察到的相似。但是，当使用J（2）可塑性对非弹性基体进行建模时，其倾斜度比实验中的要低。结果表明，计算出的能带倾角对许多模型参数不敏感，这些参数包括缺陷特性，纤维直径，体积分数和基体屈服应力。但是，正如对矩阵使用Drucker-Prager本构模型所证明的那样，它对矩阵的膨胀性非常敏感。已经发现，基体在横向于纤维的方向上变形的能力在允许获得更大，更现实的扭结带倾斜方面起着重要作用。 （C）2001 Elsevier ScienceLtd。保留所有权利。 [参考：8]

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