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On the analysis of non-homogeneous laminates using the refined zigzag theory

机译：基于精细曲折理论的非均质层压板分析

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This work shows possibilities and limitations of the refined zigzag theory (RZT) that has been used in different structural (beam, plate and shell) finite elements. The refined zigzag theory can deal with composite laminates, adding only one nodal degree of freedom per spatial dimension of the laminate, obtaining very good accuracy. It assumes that the in-plane displacements have a piece-wise linear shape across the thickness depending on the shear stiffness of each composite layer. This paper presents the main aspects of a beam/shell of revolution element used for the numerical simulations. The details of the refined zigzag theory are given also in order to discuss some limitations that occur when dealing with the non-linear phenomenon of delamination. Two examples are presented and discussed, including different inhomogeneities that show the limitations of the RZT for the treatment of partially delaminated beams.
机译：这项工作显示了已在不同结构（梁，板和壳）有限元中使用的精确曲折理论（RZT）的可能性和局限性。改进的之字形理论可以处理复合材料层压板，每个层压板空间尺寸仅增加一个节点自由度，即可获得非常好的精度。假设面内位移在整个厚度上具有分段线性形状，这取决于每个复合层的剪切刚度。本文介绍了用于数值模拟的旋转梁/壳体的主要方面。还给出了改进的之字形理论的细节，以便讨论在处理非线性分层现象时出现的一些限制。给出并讨论了两个示例，包括不同的不均匀性，这些示例显示了RZT在处理部分分层梁时的局限性。

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