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Quadratic prismatic and hexahedral solid-shell elements for geometric nonlinear analysis of laminated composite structures

机译：二次棱柱和六面体固体壳单元，用于层合复合结构的几何非线性分析

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The current contribution proposes two quadratic, prismatic and hexahedral, solid shell elements for the geometric nonlinear analysis of laminated composite structures. The formulation of the proposed solid shell elements is based on a fully three-dimensional approach combining the assumed-strain method and the reduced-integration technique. In particular, only translational degrees of freedom are considered in the formulation and a preferential direction is chosen as the thickness direction, along which an arbitrary number of integration points are arranged. Making use of different physical local frames, these elements are coupled with fully three-dimensional orthotropic constitutive equations, which allows modeling multilayered composite structures with only a single element layer through the thickness. A series of popular nonlinear benchmark tests for laminated composite structures is performed to assess the performance of the proposed SHB elements. Compared to reference solutions taken from the literature, the results provided by the SHB elements show excellent agreement. Moreover, on the whole, the proposed SHB elements perform better than state-of-the-art ABAQUS elements, which have the same geometry and kinematics, using comparable mesh discretizations. (C) 2017 Elsevier Ltd. All rights reserved.
机译：当前的贡献提出了两个方形，棱柱形和六面体的实心壳单元，用于层压复合结构的几何非线性分析。提出的固体壳单元的公式是基于将假定应变法和简化积分法相结合的全三维方法。特别地，在配方中仅考虑平移自由度，并且选择优先方向作为厚度方向，沿着该厚度方向布置任意数量的积分点。利用不同的物理局部框架，这些元素与完整的三维正交各向异性本构方程耦合，从而可以通过厚度仅使用一个元素层来对多层复合结构进行建模。对层压复合结构进行了一系列流行的非线性基准测试，以评估所提出的SHB元件的性能。与文献中的参考溶液相比，SHB元件提供的结果显示出极好的一致性。此外，总体上，使用可比的网格离散化，所提出的SHB元素的性能优于具有相同几何形状和运动学的最新ABAQUS元素。 （C）2017 Elsevier Ltd.保留所有权利。

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