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 引用本文: 袁婷婷, 任昆明, 方雨桥, 刘锦阳. 考虑非线性本构的非刚性折纸结构动力学建模与分析. 力学学报, 2022, 54(9): 2552-2566.
Yuan Tingting, Ren Kunming, Fang Yuqiao, Liu Jinyang. Dynamic modeling and analysis for non-rigid origami structure considering nonlinear constitutive relation. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(9): 2552-2566.
 Citation: Yuan Tingting, Ren Kunming, Fang Yuqiao, Liu Jinyang. Dynamic modeling and analysis for non-rigid origami structure considering nonlinear constitutive relation. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(9): 2552-2566.

## DYNAMIC MODELING AND ANALYSIS FOR NON-RIGID ORIGAMI STRUCTURE CONSIDERING NONLINEAR CONSTITUTIVE RELATION

• 摘要: 折纸结构因其大收纳比、高可控性、可重构、制造装配简单以及设计多样等优势, 在航天、生物医学、建筑、机器人、材料科学等工程领域有着广阔的应用前景. 随着折纸结构的工程应用越来越广泛, 针对低刚度折纸结构的动力学研究愈加重要. 本文将非刚性折纸结构等效为带卷簧的空间桁架结构, 建立了一种通用的杆–链动力学模型. 考虑材料的几何非线性, 采用基于Ogden超弹性本构的杆单元来模拟折痕和虚拟折痕, 可适用于作大范围运动并具有大变形的折纸结构. 引入非线性卷簧来体现折痕的抗弯作用, 相较于传统的卷簧本构模型, 本文提出的改进的非线性卷簧本构模型具有更强的通用性和鲁棒性, 能够有效避免接触碰撞动力学中折叠面的穿透. 基于虚功原理, 建立了考虑阻尼效应的非刚性折纸多体系统的动力学方程, 并采用变步长的广义-α 法求解. 最后, 对三种经典折叠形式的非刚性折纸结构进行动力学仿真, 验证了本文提出的杆–链动力学模型的准确性和高效性. 通过施加虚拟折痕和修正初始构型, 有效解决了刚性折纸模型中展开和收拢过程的锁定问题. 与刚性折纸模型相比, 杆–链动力学模型具有更好的数值模拟通用性, 并能够给出具有大变形张紧构型. 在此基础上, 揭示了非刚性折纸结构复杂的动力学行为, 并对多稳态、瞬态动力学和波动力学特性进行分析.

Abstract: Due to the advantages of large storage ratio, high controllability, reconfigurability, easy assembly and diversified design, the origami structure has broad application prospects in the fields of aerospace, biomedicine, architecture, robotics, material science, etc. With the development of origami structure engineering, the dynamic research for the origami structure with low stiffness becomes more important. In this paper, a general bar-and-hinge dynamics model is developed, in which a non-rigid origami structure is equivalent to a spatial truss structure with rotational spring. Considering the geometric nonlinearity of the material, a bar element based on Ogden hyperelastic constitutive model is used to simulate the creases and virtual creases of the non-rigid origami structure, which can deal with the non-rigid origami structure with large overall motions and large deformations. A nonlinear rotational spring is introduced to reflect the bending resistance of the crease. Compared with the traditional rotational spring constitutive model, the modified nonlinear rotational spring constitutive model proposed in this paper has stronger versatility and robustness, and can effectively avoid the mutual penetration between the folding surfaces in contact-impact dynamics. Based on the principle of virtual work, the dynamic equations of the non-rigid origami multibody system considering the damping effect are established, which are solved by the variable-step generalized-α method. Finally, a series of numerical examples of three classical origami structures are presented to verify the accuracy and efficiency of the bar-and-hinge dynamics model proposed in this paper. Furthermore, by adding virtual creases and correcting the initial configuration, the locking problem of the unfolding and folding process in the rigid origami model is effectively resolved. Compared with the rigid origami model, the bar-and-hinge dynamics model can continue to perform further calculation and provide the fully deployed configuration with large deformation. On this basis, the complex dynamic behaviors of the non-rigid origami structure are revealed, and the mechanics characteristics of multi-stable, transient dynamics and wave dynamics are analyzed.

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