The pure shear mode can achieve a large and stable deformation in the actuation of dielectric elastomers (DEs). In this paper, based on our previously designed deformation controller, we propose the method of tuning two inplane stresses and applied voltage/charge to realize precise pure shear deformation, by deducing the governing equations of voltage- and charge-loaded DEs. The evolution of electromechanical stabilities of voltage- and charge-loaded DEs under pure shear deformation mode is considered. The maximum stable electromechanical deformation related to electromechanical failures is simultaneously calculated. It is found that the stable deformation and parameter variation tendency have different dependency for the loading modes of DEs. The critical conditions of occurrence of possible electromechanical failures are also clarified. This research can be utilized to beforehand select the tension stresses and applied voltage/charge to strengthen the electromechanical stability of DEs in pure shear deformation mode.

纯剪切模式可以在介电弹性体 (DE) 的驱动中实现大而稳定的变形。在本文中，基于我们之前设计的变形控制器，我们提出了通过推导电压和电荷加载的 DE 的控制方程来调整两个面内应力和施加的电压/电荷以实现精确的纯剪切变形的方法。考虑了纯剪切变形模式下电压和电荷加载 DE 的机电稳定性的演变。同时计算与机电故障相关的最大稳定机电变形。发现稳定变形和参数变化趋势对 DE 的加载模式具有不同的依赖性。还阐明了可能发生机电故障的临界条件。