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arXiv 2104.09262math.NAcs.CEcs.NA
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一种几何非线性梁单元的有效列式

Efficient formulation of a geometrically nonlinear beam element

Milan Jirásek, Emma La Malfa Ribolla, Martin Horák

摘要:

本文提出了一种二维几何非线性梁单元,它可以容纳任意大的旋转截面。该公式是基于平衡方程的积分形式,结合运动学方程和广义材料方程,导致一组三个一阶微分方程。这些方程,然后离散有限差分和边值问题转换成一个初值问题使用的技术启发的打靶法。在保持整体自由度数目不变的情况下,通过在单元级上细化积分格式,方便地提高了数值逼近的精度,从而提高了计算效率。该单元已被实现为一个开源的有限元代码。数值算例表明,与标准梁元素制定的有限应变框架和解析解的有利比较。

英文摘要:

The paper presents a two-dimensional geometrically nonlinear formulation of a beam element that can accommodate arbitrarily large rotations of cross sections. The formulation is based on the integrated form of equilibrium equations, which are combined with the kinematic equations and generalized material equations, leading to a set of three first-order differential equations. These equations are then discretized by finite differences and the boundary value problem is converted into an initial value problem using a technique inspired by the shooting method. Accuracy of the numerical approximation is conveniently increased by refining the integration scheme on the element level while the number of global degrees of freedom is kept constant, which leads to high computational efficiency. The element has been implemented into an open-source finite element code. Numerical examples show a favorable comparison with standard beam elements formulated in the finite-strain framework and with analytical solutions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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