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Experimental investigation of the effect of temperature on the strength of polyimide contact structures
Institution:1. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China;2. China Nuclear Power Engineering Company Ltd., Beijing 100840, China;3. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;1. Department of Chemistry, Inorganic Chemistry, University of Basel, Spitalstrasse 51, CH-4056 Basel, Switzerland;2. Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK;3. Institute of Organic Chemistry and Biochemistry, Centre of Novel Antivirals and Antineoplastics, Academy of Sciences, CZ-16610 Prague, Czech Republic;1. School of Chemistry and Chemical Engineering, Huangshan University, Huangshan 245041, China;2. State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, China;1. Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata 700 032, India;2. Departamento de Química Inorgánica, c/ Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain;1. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, PR China;2. Shanghai Qifan Wire and Cable Co., Ltd., Shanghai, 200008, PR China
Abstract:A new photogrammetry based measurement technique for contact areas in line contact structures is developed. From the data collected by this technique, a method for measuring the contact strength of contact structures in high temperature applications is proposed. The contact strength of a line contact structure of polyimide at different temperatures is measured; the results show that the increase in temperature decreases the contact strength of the structure. The effect of temperature on the contact strength is studied by investigating the occurrence and evolution of yielding core within the structure at different temperatures. The decrease in the yield strength and elastic modulus of the polyimide material at high temperature induces core yielding at lower loads and eases the propagation of core yielding to the surface.
Keywords:Polyimide  Contact strength  Temperature effect  Yielding core  Digital image correlation
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