论文标题

在一般的多层超弹性板上生长理论

On a general multi-layered hyperelastic plate theory of growth

论文作者

Du, Ping, Li, Zhanfeng, Chen, Xiaoyi, Wang, Jiong

论文摘要

在本文中,我们提出了在非线性弹性框架内的多层超弹性板理论。首先,建立了用于多层超弹性板的3D管理系统,其中包含了生长效应以及不同层的材料和几何参数。然后,采用了一种串联的截断方法来消除3D管理系统中的厚度变量。应用详细的计算方案用于得出系列扩展中系数函数的迭代关系。通过进一步的操纵,建立了具有相关边界条件的2D矢量板方程系统,该方程仅包含板底层中的未知数。为了显示当前板理论的效率,研究了三个有关生长诱导的变形和多层板样品不稳定性的典型示例。获得了板方程的一些分析和数值解,这可以为板样品的生长行为提供准确的预测。此外,还研究了通过差异生长的多层超弹性板的“形状编程”问题。得出了一些典型多层板的形状编程的明确公式,该公式涉及3D目标形状的基本数量。通过使用这些公式,可以准确控制生长过程中板的形状演变。在当前工作中获得的结果有助于设计具有多层板结构的智能软设备。

In this paper, we propose a multi-layered hyperelastic plate theory of growth within the framework of nonlinear elasticity. First, the 3D governing system for a general multi-layered hyperelastic plate is established, which incorporates the growth effect, and the material and geometrical parameters of the different layers. Then, a series expansion-truncation approach is adopted to eliminate the thickness variables in the 3D governing system. An elaborate calculation scheme is applied to derive the iteration relations of the coefficient functions in the series expansions. Through some further manipulations, a 2D vector plate equation system with the associated boundary conditions is established, which only contains the unknowns in the bottom layer of the plate. To show the efficiency of the current plate theory, three typical examples regarding the growth-induced deformations and instabilities of multi-layered plate samples are studied. Some analytical and numerical solutions to the plate equation are obtained, which can provide accurate predictions on the growth behaviors of the plate samples. Furthermore, the problem of `shape-programming' of multi-layered hyperelastic plates through differential growth is studied. The explicit formulas of shape-programming for some typical multi-layered plates are derived, which involve the fundamental quantities of the 3D target shapes. By using these formulas, the shape evolutions of the plates during the growing processes can be controlled accurately. The results obtained in the current work are helpful for the design of intelligent soft devices with multi-layered plate structures.

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