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Nonlinear shell theory with finite rotations and finite strains: recent achievements

机译:具有有限旋转和有限应变的非线性壳理论:最新成果

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We discuss a theoretical formulation of a fully nonlinear shell model, capable of representing finite rotations and finite strains. The latter imposes that one should account for through-the-thickness stretching, which allows for direct use of 3d constitutive equations from classical continuum model. Three different possibilities for implementing this kind of shell model within the framework of the finite element method are examined, the first one leading to 7 nodal parameters and the remaining two to 6 nodal parameters. The 7-parameter shell model with no simplification of kinematic terms is compared to the 7-parameter shell model which exploits usual simplifications of the Green-Lagrange strains. Two different ways of implementing the incompatible mode method for reducing the number of parameters to 6 are presented. One implementation uses an additive decomposition of the strains and the other an additive decomposition of the deformation gradient. A couple of numerical examples are given to illustrate performance of the shell elements developed herein.
机译:我们讨论了完全非线性的壳模型的理论公式,该模型能够表示有限的旋转和有限的应变。后者强加了厚度扩展,这允许直接使用经典连续体模型中的3d本构方程。研究了在有限元方法框架内实现这种壳模型的三种不同可能性,第一种导致7个节点参数,其余2到6个节点参数。将不简化运动学术语的7参数壳模型与采用Green-Lagrange菌株的常规简化方法的7参数壳模型进行了比较。提出了两种实现不兼容模式方法以将参数数量减少到6的不同方式。一种实现方式是对应变进行加法分解,另一种实现方式是对变形梯度进行加法分解。给出了两个数值示例来说明本文开发的壳体元件的性能。

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