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介电型电活性聚合物(EAP)驱动器在工作过程中,边界条件及驱动电压的改变经常导致EAP薄膜发生起皱现象以及介电击穿,致使驱动器失去工作能力。为了保障驱动器的正常工作,避免失效行为的发生,对EAP驱动器的失效行为进行了研究。针对锥形驱动器,计算出不同驱动电压下驱动器EAP薄膜的变形情况以及其中的应力、应变和电场强度的分布情况。利用薄膜起皱判别方法,对驱动器的起皱行为进行预测,同时分析了预拉伸倍数对驱动器失效的影响。试验结果表明,EAP驱动器的理论临界起皱电压与理论分析比较吻合,预拉伸可以提高薄膜的机电稳定性能。研究结果可用于预测介电型EAP驱动器发生失效的临界电压,有利于保障驱动器的安全工作。
Dielectric EAP Actuators During operation, changes in the boundary conditions and driving voltage often lead to wrinkling of the EAP film and dielectric breakdown, rendering the driver incapacitated. In order to ensure the normal operation of the driver and avoid the failure, the failure behavior of the EAP driver was studied. For taper driver, the deformation of EAP film under different driving voltage and the distribution of stress, strain and electric field intensity are calculated. Using the method of film wrinkle determination, the wrinkling behavior of the actuator was predicted. At the same time, the influence of pre-stretching multiple on the failure of the actuator was analyzed. The experimental results show that the theoretical critical wrinkling voltage of EAP driver is in good agreement with the theoretical analysis. Pre-stretching can improve the electromechanical stability of the film. The results of this study can be used to predict the critical voltage at which a dielectric EAP driver will fail, which will help to ensure the safe operation of the driver.