Reconfigurable network structure with tunable multiple deformation modes exhibits promising applications in functional electromagnetic devices, frequency-reconfigurable antennas, flexible electronic devices, and robots with multiple motion modes due to its capability to realize multiple working characteristics in one device or system. In most previous studies on reconfigurable network structures with large deformation, researchers focus on tuning the deformation and mechanical properties for a specific deformation mode of the network structure. Therefore, designs for reconfigurable network structures to achieve multiple deformation modes and large deformation still remain a challenge. The inverse design of the reconfigurable network structure with desired mechanical responses under some specific external actuations is difficult due to the lack of theoretical models to describe the finite deformation of network structures actuated by external fields. This paper introduces a mechanical design strategy for the reconfigurable network structure to achieve a large deformation (over 45%) and multiple mechanical responses under the electrothermal actuation, including the uniform or non-uniform shrinkage and expansion, shearing, and bending deformation modes. Theoretical models for this reconfigurable network structure are developed to predict these unique mechanical responses and inversely design the reconfigurable network structure for the desired deformation modes in a facilitating method. The accuracy of the designed reconfigurable network structure is validated by the corresponding finite element analyses (FEAs) and experiments qualitatively and quantitatively. In accordance with these theoretical models, the deformed configuration and analytic solutions for some critical mechanical quantities, such as the electrothermally actuated effective strain for shrinkage, expansion and shearing deformation modes, and the bending angle for bending deformation modes, are obtained. The electrothermally actuated deformation of network structures can be tuned by the value of the normalized geometrical parameter d/t₁ and the electrothermal actuation strategy. Furthermore, demonstrative experiments and FE simulations illustrate that multiple deformation modes can be achieved in the same network structure through the individual actuation strategy. This work provides guidelines from the aspects of theoretical predictions, FEAs, and experiments for future designs of the reconfigurable network structures to achieve desired mechanical responses.

具有可调多种变形模式的可重构网络结构在功能电磁设备、频率可重构天线、柔性电子设备和具有多种运动模式的机器人等方面具有广阔的应用前景，因为它能够在一个设备或系统中实现多种工作特性。在以往大多数关于大变形可重构网络结构的研究中，研究人员侧重于针对网络结构的特定变形模式调整变形和力学性能。因此，设计可重构网络结构以实现多种变形模式和大变形仍然是一个挑战。由于缺乏描述由外部场驱动的网络结构的有限变形的理论模型，在某些特定外部驱动下具有所需机械响应的可重构网络结构的逆向设计是困难的。本文介绍了可重构网络结构的机械设计策略，以在电热驱动下实现大变形（超过 45%）和多种机械响应，包括均匀或非均匀收缩和膨胀、剪切和弯曲变形模式。开发了这种可重构网络结构的理论模型来预测这些独特的机械响应，并以一种促进方法为所需的变形模式反向设计可重构网络结构。通过相应的有限元分析 (FEA) 和定性和定量实验验证了设计的可重构网络结构的准确性。根据这些理论模型，获得了一些关键力学量的变形配置和解析解，例如收缩、膨胀和剪切变形模式的电热驱动有效应变，以及弯曲变形模式的弯曲角度。网络结构的电热驱动变形可以通过归一化几何参数的值进行调整 获得了一些关键力学量的变形构型和解析解，例如收缩、膨胀和剪切变形模式的电热驱动有效应变，以及弯曲变形模式的弯曲角度。网络结构的电热驱动变形可以通过归一化几何参数的值进行调整 获得了一些关键力学量的变形构型和解析解，例如收缩、膨胀和剪切变形模式的电热驱动有效应变，以及弯曲变形模式的弯曲角度。网络结构的电热驱动变形可以通过归一化几何参数的值进行调整d/t ₁和电热驱动策略。此外，演示实验和有限元模拟表明，可以通过单独的驱动策略在同一网络结构中实现多种变形模式。这项工作从理论预测、FEA 和实验等方面为可重构网络结构的未来设计提供了指导，以实现所需的机械响应。