A bladder-free, non-fluidic, conductive McKibben artificial muscle operated electro-thermally. (15th December 2016)

• Record Type: Journal Article
• Authors: Sangian, Danial; Foroughi, Javad; Farajikhah, Syamak; Naficy, Sina; Spinks, Geoffrey M
• Is Part Of: Smart materials and structures. Volume 26:Number 1(2017:Jan.)
• Publication Date: 2016-12-15
• Subjects: actuator -- McKibben artificial muscle -- paraffin -- braid; Smart materials -- Periodicals; Strucural design -- Periodicals; 620.11
• DOI: 10.1088/1361-665X/26/1/015011
• Languages: English
• ISSNs: 0964-1726

Abstract

Abstract: Fluidic McKibben artificial muscles that operate pneumatically or hydraulically provide excellent performance, but require bulky pumps/compressors, valves and connecting lines. Use of a pressure generating material, such as thermally expanding paraffin wax, can eliminate the need for these pumps and associated infrastructure. Here we further develop this concept by introducing the first bladderless McKibben muscle wherein molten paraffin is contained by surface tension within a tailored braid. Incorporation of electrically conductive wires in the braid allows for convenient Joule heating of the paraffin. The muscle is light (0.14 g) with a diameter of 1.4 mm and is capable of generating a tensile stress of 50 kPa (0.039 N) in 20 s. The maximum contraction strain of 10% (7.6 kPa given load) was achieved in 60 s with an applied electrical power of 0.35 W.