Experimental study on the interlayer friction and wear mechanism between armor wires of umbilicals |
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| Institution: | 1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, No. 2 Linggong Road, Dalian, 116023, China;2. School of Ocean Science and Technology, Dalian University of Technology, No.2 Dagong Road, Panjin, 124221, China;3. Ningbo Institube of Dalian University of Technology, No. 26 Yucai Road, Ningbo, 315000, China;4. Institute of Marine Machinery, College of Mechanical and Electrical Engineering, Harbin Engineering University, No. 145 Nantong Street, Harbin, 150001, China;1. School of Naval Architecture and Ocean Engineering, Dalian University of Technology (DUT), NO-116024, Dalian, China;2. Department of Marine Technology and Centre for Autonomous Marine Operations and Systems (AMOS), Norwegian University of Science and Technology (NTNU), Trondheim, 7491, Norway;1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, International Research Center for Computational Mechanics, Dalian University of Technology, Dalian, 116024, China;2. Ningbo Research Institute of Dalian University of Technology, Ningbo, 315016, China;3. State Key Laboratory of Structural Analysis for Industrial Equipment, School of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China;1. College of Engineering, Ocean University of China, Qingdao, 266100, PR China;2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;3. Liaoning Engineering Laboratory for Deep-Sea Floating Structure, School of Naval Architecture, Dalian University of Technology, Dalian, 116024, PR China;1. CAS Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Beijing, 100190, China;2. School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China;3. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai, 200240, China;4. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China |
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| Abstract: | Friction and wear behavior between armor wire layers of umbilical plays an important role in its mechanical properties, in particular its fatigue life. The present paper addresses friction tests to investigate the interlayer sliding friction and wear mechanism of armor wires in an umbilical. A series of friction tests were carried out to study the evolution of coefficient of friction (COF) and wear between armor wire layers. The results show that the COF increases with increasing number of reciprocating sliding cycles in dry friction condition. A dual stable trend was found in the evolution process of interlayer friction and wear of armor wires. A friction model was proposed to describe this trend by dividing the evolution process into three stages: the initial stable stage, the transition stage, and the latter stable stage. The mechanism of the dual stable trend was revealed, which was mainly caused by wear process of nylon fiber tape, and effected by dry/wet wear condition and wear coefficient. The effect of the contact condition, sliding amplitude and number of nylon fiber tape on COF was studied. The COF of the latter stable stage increases with increasing sliding amplitude and number of layers of nylon fiber tape. The finding in this paper provides a valuable approach for a more accurate fatigue life prediction of an umbilical. |
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| Keywords: | Umbilical Armor wire Anti-wear tape Coefficient of friction Wear |
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