Stability analysis of dielectric elastomer film actuator
Stability analysis of dielectric elastomer film actuator
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DOI：
10.1007/s11431-009-0247-5
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发表时间：
2009-08
期刊：
影响因子：
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通讯作者：
Yanju Liu;Liwu Liu;Shouhua Sun;Zhen Zhang;J. Leng
中科院分区：
文献类型：
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作者：
Yanju Liu;Liwu Liu;Shouhua Sun;Zhen Zhang;J. Leng
介电弹性体（DE）是智能执行器中最有前途的电活性高分子材料。当一块DE薄膜夹在两个具有高电场的柔性电极之间时，由于电极之间的静电力，薄膜在平面内膨胀，在平面外收缩，使其厚度变薄。较薄的厚度导致较高的电场，从而再次反向挤压薄膜。当电场超过临界值时，介电场击穿，致动器失效。基于非线性机电场理论，采用具有两个材料常数的弹性应变能函数对介电弹性体作动器的稳定性进行了分析。结果表明，随着材料常数比值的增大，致动器的稳定性有所提高，可用于致动器的设计。最后，将该方法推广到包含三个及以上材料常数的弹性应变能函数的介电弹性体稳定性研究。
Dielectric elastomer (DE) is the most promising electroactive polymer material for smart actuators. When a piece of DE film is sandwiched between two compliant electrodes with a high electric field, due to the electrostatic force between the two electrodes, the film expands in-plane and contracts out-of-plane so that its thickness becomes thinner. The thinner thickness results in a higher electric field which inversely squeezes the film again. When the electric field exceeds the critical value, the dielectric field breaks down and the actuator becomes invalid. An elastic strain energy function with two material constants is used to analyze the stability of the dielectric elastomer actuator based on the nonlinear electromechanical field theory. The result shows that the actuator improves its stability as the ratiokof the material constants increases, which can be applied to design of actuators. Finally, this method is extended to study the stability of dielectric elastomers with elastic strain energy functions containing three and more material constants.