Electrically induced permanent strain in ionic polymer-metal composite actuators

被引:8
作者
Newbury, KM [1 ]
Leo, DJ [1 ]
机构
[1] Virginia Tech, Ctr Intelligent Mat Syst & Struct, Blacksburg, VA 24061 USA
来源
SMART STRUCTURES AND MATERIALS 2002: ELECTROACTIVE POLYMER ACTUATORS AND DEVICES (EAPAD) | 2002年 / 4695卷
关键词
IPMC; ionic polymer; permanent strain;
D O I
10.1117/12.475150
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Numerous researchers have shown that ionic polymer-metal composite (IPMC) actuators are capable of large strains when subjected to relatively small electric fields. In this paper, we present data showing that, with some electrical inputs, a portion of the strain remains once the electric field is removed. The remaining strain is on the order of 0.1%, and its magnitude is correlated to the total charge delivered to the actuator. Several experiments were conducted to explore the relationship between the electrically induced permanent strain and input shape, actuator geometry, and boundary conditions. The permanent strain magnitude was found to increase with actuator length and with the magnitude of a pulse input. For 20 second pulse inputs applied to a 5 mm x 29 mm actuator, the ratio of the permanent strain to the total electric charge delivered per unit actuator length was approximately 10 %strain/(C/mm). This ratio dropped as pulse duration was increased. A comparison of strain energy associated with the permanent strain to the total electrical work done on the actuator yielded values on the order of 5 muJ/J. Previous research has indicated that IPMCs are not suitable for DC actuation. However, the permanent strain phenomenon may provide a means by which IPMCs can be used as DC actuators.
引用
收藏
页码:67 / 77
页数:11
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