论文标题
通过加载协议调整软电介质弹性体的拉力不稳定性
Tuning the pull-in instability of soft dielectric elastomers through loading protocols
论文作者
论文摘要
当介电弹性体的厚度急剧下降会导致电崩解时，引进（或电力机械）的不稳定性发生了，这限制了介电设备的应用。在这里，我们得出了通过不同的载荷方法引起的介电介质的不稳定性的标准：电压控制，电荷控制，固定的预压力和固定的预拉伸，通过分析驱动系统的自由能。 Hessian标准在载荷曲线中标识了弹性体将迅速伸展并失去稳定性的最大值，并且可以看作是失败的途径。我们介绍了新霍克理想电介质的数值计算，并在通过电崩解之前在故障之前获得介电的最大允许致动伸展。我们发现，将固定的预压力或固定的预拉伸到电荷驱动的介电可能会降低弹性体的可伸缩性，弹性体的可伸缩性是这种情况，这与电压驱动介电的情况相反。结果表明，可以通过调整驱动方法来实现介电弹性体的可逆大型启动。
Pull-in (or electro-mechanical) instability occurs when a drastic decrease in the thickness of a dielectric elastomer results in electrical breakdown, which limits the applications of dielectric devices. Here we derive the criteria for determining the pull-in instability of dielectrics actuated by different loading methods: voltage-control, charge-control, fixed pre-stress and fixed pre-stretch, by analyzing the free energy of the actuated systems. The Hessian criterion identifies a maximum in the loading curve beyond which the elastomer will stretch rapidly and lose stability, and can be seen as a path to failure. We present numerical calculations for neo-Hookean ideal dielectrics, and obtain the maximum allowable actuation stretch of a dielectric before failure by electrical breakdown. We find that applying a fixed pre-stress or a fixed pre-stretch to a charge-driven dielectric may decrease the stretchability of the elastomer, a scenario which is the opposite of what happens in the case of a voltage-driven dielectric. Results show that a reversible large actuation of a dielectric elastomer, free of the pull-in instability, can be achieved by tuning the actuation method.
