Abstract This paper studies elasto-plastic large deformation behaviour of thin shell structures using the isogeometric computational approach with the main focus on the efficiency in modelling the multi-patches and arbitrary material formulation. In terms of modelling, we employ the bending strip method to connect the patches in the structure. The incorporation of bending strips allows to eliminate the strict demand of the C1 continuity condition, which is postulated in the Kirchhoff-Love theory for thin shell, and therefore it enables us to use the standard multi-patch structure even with C0 continuity along the patch boundaries. Furthermore, arbitrary nonlinear material models such as hyperelasticity and finite strain plasticity are embedded in the shell formulation, from which a unified thin shell formulation can be achieved. In terms of analysis, the Bezier decomposition concept is used to retain the local support of the traditional finite element. The performance of the presented approach is verified through several numerical benchmarks.

中文翻译：

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基于等几何法的多片薄壳弹塑性大变形分析

摘要 本文使用等几何计算方法研究薄壳结构的弹塑性大变形行为，主要关注多面片和任意材料配方建模的效率。在建模方面，我们采用弯曲条的方法来连接结构中的补丁。弯曲条的引入可以消除基尔霍夫-洛夫理论中对薄壳假设的 C1 连续性条件的严格要求，因此它使我们能够使用标准的多面片结构，即使沿面片具有 C0 连续性边界。此外，超弹性和有限应变塑性等任意非线性材料模型都嵌入到壳公式中，从中可以实现统一的薄壳公式。在分析方面，采用贝塞尔分解概念，保留了传统有限元的局部支持。通过几个数值基准验证了所提出方法的性能。