Cross-shaped twisting structure using SMA-based smart soft composite

• DOI: 10.1007/s40684-014-0020-5
• Publication Date: 2014-04-08T20:38:39Z
• Authors: Hugo Rodrigue; Wei Wang; Binayak Bhandari; Min-Woo Han; Sung-Hoon Ahn
• Keywords: 0209 industrial biotechnology; 02 engineering and technology

This paper introduces a novel geometry for a pure-twisting soft morphing actuator that improves the stability of the actuator and allows it to obtain a larger twisting angle. The smart soft composite (SSC) actuator uses pair of NiTi shape memory alloy (SMA) wires embedded in a cross-shaped polydimethylsiloxane (PDMS) matrix at constant and opposite eccentricity across the cross-section in opposite directions in order to produce a twisting motion. To evaluate the twisting performance of the cross-shaped actuator, specimens with rectangular cross-sections and cross-shaped cross-sections are made and their twist angles are measured and compared. Results show that the cross-shaped actuator is capable of a higher twisting rate by using a thinner flange due to a more stable twisting motion.