Electrically-actuated artificial muscle fiber with bidirectional linear strain and preparation method thereof

An electrically-actuated artificial muscle fiber with bidirectional linear strain, comprising leads, an electrical packaging structure, a fiber matrix, electrode layers and insulating layers, wherein the artificial muscle fiber takes the fiber matrix as a skeleton, upper and lower layers are covered with one electrode layer respectively, one insulating layer is covered on their surfaces, a helical fiber body is formed by winding, finally, the artificial muscle fiber is formed through packaging by the electrical packaging structure, wherein metal wires are taken as the leads and respectively connected to upper and lower layers of electrodes;

• voltages with different signs are applied between the upper and lower layers of electrodes or one of layers of electrodes is grounded while an other layer of electrode is applied with voltages with arbitrary signs, and the artificial muscle fiber realizes active contraction actuation;
• voltages with same signs are applied between the upper and lower layers of electrodes, and the artificial muscle fiber realizes active elongation actuation.