Computation of the effective mechanical properties including nonclassical moduli of 2.5D and 3D interlocks by micromechanical approaches
Computation of the effective mechanical properties including nonclassical moduli of 2.5D and 3D interlocks by micromechanical approaches
复制标题
DOI：
10.1016/j.compositesb.2016.04.066
复制
发表时间：
2016-08
影响因子：
13.1
通讯作者：
Y. Rahali;M. Assidi;I. Goda;A. Zghal;J. Ganghoffer
中科院分区：
文献类型：
--
作者：
Y. Rahali;M. Assidi;I. Goda;A. Zghal;J. Ganghoffer
基于离散均匀化方法的细观力学方案被开发来预测3D干纺织品的有效力学性能，包括弯曲模量，并通过考虑在介观水平上的附加旋转自由度来考虑内部尺度效应。对于给定的互锁识别的重复单元被表示为一组结构梁状元素，其定义了具有周期性边界条件的代表性体积元素（RVE）。RVE内纱线之间复杂的相互作用导致纱线的非仿射运动，从而产生内部尺度效应，这可以通过离散均匀化方法获得的微极各向异性连续体来解释。Cosserat模量与相关的内部弯曲长度与表征每个预成型件内纱线内部组织的微观结构几何和力学参数一起确定。一个令人满意的协议之间的有效的经典和非经典模量预测均匀化和有限元模拟计算。
Micromechanical schemes based on the discrete homogenization method are developed to predict the effective mechanical properties of 3D dry textiles, including the bending moduli, and accounting for internal scale effects by the consideration of additional rotational degrees of freedom at the mesoscopic level. The unit of repeat identified for a given interlock is represented as a set of structural beam like elements that defines the representative volume element (RVE), with periodicity boundary conditions. The complex interactions between yarns within the RVE lead to a non affine motion of the yarns responsible for internal scale effects, which are accounted for by a micropolar anisotropic continuum obtained by the discrete homogenization method. The Cosserat moduli are identified together with the associated internal bending lengths versus the microstructural geometrical and mechanical parameters that characterize the internal organization of yarns within each preform. A satisfactory agreement is obtained between the effective classical and nonclassical moduli predicted by homogenization and those computed by finite element simulations.