Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Thermo-mechanical behaviour of coiled monofilament polymer fibers
Submission Author:
Sarah S. Mendes , MG , Brazil
Co-Authors:
Luiz Nunes, Sarah S. Mendes
Presenter: Sarah S. Mendes
doi://10.26678/ABCM.COBEM2017.COB17-0629
Abstract
In this work, the thermo-mechanical behaviour of coiled nylon fishing lines was investigated. In the experimental procedure, a polyamide coiled line (0.8 mm of diameter) was pre-stretched holding the distance between its ends constant and was subjected to different temperatures (range from 30ºC to 120ºC). Under this temperature condition, the homochiral coiled fiber of nylon fiber tends to contract upon being heated and expanded upon being cooled. During tests, the reaction force was monitored using a cell load and images of coiled line were captured every 5 seconds. The Digital Image Correlation software was used to attain the displacement fields. The rotation and the deformation of the specimens were estimated with these displacement fields. The pitch angle of the coiled fiber was measured using the ImageJ software. The helical spring theory together with the experimental data was used to describe the termo-mechanical behaviour of coiled fiber. Different tests were performed considering coiled fibers with 20 mm length and three values of nominal tension of manufacture, 10,35 MPa, 16,35 MPa and 20,35 MPa. The rotation of these coiled lines was inversely proportional to the initial size of the specimens, and the deformation was not affected by it. The torsional stiffness, deformation and force were proportional to the value of the spring index.
Keywords
Artificial muscle, Polymeric actuator, Fishing Line, DIC method
