Exploring the tensile ice adhesion strength of surfaces using a newly designed and verified measurement apparatus
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Mirshahidi, Kianasadat
issued: 2021-04-14T16:54:17Z
issued: 2021
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: In cold regions, icing is a serious challenge that people face daily. Ice accretion on bridge cables, wind turbines and ship hulls are only a few examples of where icing can have fatal effect. Much research has been done to overcome this problem using various solutions such as producing surfaces that delay ice formation or preventing ice accumulation using coatings exhibiting low adhesion to ice. Among these, elastomeric materials have repeatedly been reported as successful coatings with ultra-low adhesion values to ice, arising from an interfacial instability which was recently proposed as the underlying phenomena. This instability, interfacial cavitation, occurs when tensile forces are indirectly generated at the ice/substrate interface during shear. Most research has focused on studying, measuring, and manipulating ice adhesion of surfaces by shear forces. In this work, a high throughput, low-cost apparatus was designed and benchmarked to measure the tensile ice adhesion strength of various surfaces. The performance and precision of the setup was verified using experimental trials and the effect of various parameters such as temperature, pull-off speed, substrate thickness, and ice/substrate interfacial area were characterized. We then delved deeper in the ice adhesion behavior of polydimethylsiloxane (PDMS), a commonly used elastomeric ice phobic coating, comparing its pure tensile adhesive fracture to its typical shear adhesion behavior. It was found that tensile ice adhesion strength of PDMS is usually higher than the shear ice adhesion strength. Also, all parameters (such as thickness, elastic modulus, and probe speed) affected the tensile ice adhesion strength in the same manner they did with the shear ice adhesion strength, except roughness. When roughness of the PDMS surface was increased to up to an Sq = 32 μm, the shear ice adhesion strength remained almost constant. We also developed a superhydrophobic PDMS that maintained the low tensile and shear ice …
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/77761
note: EXPLORING THE TENSILE ICE ADHESION STRENGTH OF SURFACES USING A NEWLY DESIGNED AND VERIFIED MEASUREMENT APPARATUS by Kianasadat Mirshahidi BSc., Golestan University, 2018 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Mechanical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) April 2021 © Kianasadat Mirshahidi, 2021 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the dissertation entitled: Exploring the Tensile Ice Adhesion Strength of Surfaces Using a Newly Designed and Verified Measurement Apparatus submitted by Kianasadat Mirshahidi in partial fulfillment of the requirements for the degree of Master of Applied Science Dr. Kevin Golovin, School of Engineering, Faculty of Applied Science Supervisor Dr. Abbas Milani, School of Engineering, Faculty of Applied Science Supervisory Committee Member Dr. Mohammad Hossein Zarifi, School of Engineering, Faculty of Applied Science Supervisory Committee Member Dr. Kyle Larson, Department of Earth, Environmental and Geographic Sciences, Irving K. Barber Faculty of Science University Examiner iii Abstract In cold regions, icing is a serious challenge that people face daily. Ice accretion on bridge cables, wind turbines and ship hulls are only a few examples of where icing can have fatal effect. Much research has been done to overcome this problem using various solutions such as producing surfaces that delay ice formation or preventing ice accumulation using coatings exhibiting low adhesion to ice. Among these, elastomeric materials have repeatedly been reported as successful coatings with ultra-low adhesion values to ice, arising from an interfacial instability which was recently proposed as the underlying phenomena. This instability, interfacial cavitation, occurs when tensile forces are indirectly generated at the ice/substrate int…
has type: Thesis/Dissertation
date issued: 2021-05
is shown at: 10.14288/1.0396687
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/77761