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arXiv 2107.04842cond-mat.soft
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离散弹性杆和带的简单变形测量

Simple deformation measures for Discrete elastic rods and ribbons

Kevin Korner, Basile Audoly, Kaushik Bhattacharya

摘要:

离散弹性杆法(Bergou等人,2008)是一种用于模拟细长弹性体的数值方法。它的工作原理是将中心线表示为多边形链,将两个垂直方向连接到每个段,并定义离散的拉伸、弯曲和扭转变形度量以及离散的应变能。在这里,我们研究了一种替代配方的离散变形措施的定义更简单的基础上,这个模型。这两种配方都同样符合连续杆模型。导出了离散变形测度的第一梯度和第二梯度的简单公式,使离散应变能的Hessian计算变得容易。给出了一些数值例子。该方法也被扩展到不可扩展的带状物所描述的Wunderlich模型,和可发展性约束和应变梯度的能量的依赖关系被自然地处理。

英文摘要:

The Discrete elastic rod method (Bergou et al., 2008) is a numerical method for simulating slender elastic bodies. It works by representing the center-line as a polygonal chain, attaching two perpendicular directors to each segment, and defining discrete stretching, bending and twisting deformation measures and a discrete strain energy. Here, we investigate an alternative formulation of this model based on a simpler definition of the discrete deformation measures. Both formulations are equally consistent with the continuous rod model. Simple formulas for the first and second gradients of the discrete deformation measures are derived, making it easy to calculate the Hessian of the discrete strain energy. A few numerical illustrations are given. The approach is also extended to inextensible ribbons described by the Wunderlich model, and both the developability constraint and the dependence of the energy of the strain gradients are handled naturally.

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