Mechanical properties of fluorinated ethylene propylene (FEP) foils in use for neutrino detector project |
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| Institution: | 1. Space Structures Research Center, Shanghai Jiao Tong University, Shanghai 200240, China;2. State Key Laboratory of Ocean Engineering, Shanghai 200240, China;3. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China;1. Department of Polymer Science & Engineering, Hannam University, Daejeon 34054, Republic of Korea;2. Underground Solutions Inc., Poway, CA 92064, USA;3. Ansco Inc., Daejeon 34051, Republic of Korea;1. Toray Research Center, Inc., Otsu, 520-8567, Japan;2. Application R&D Center, Horiba Ltd., Kyoto, 601-8510, Japan;3. Rakuyo Giken Co., Ltd., Kumiyama-cho, Kyoto, 613-0023, Japan;4. Graduate School of Science, Hiroshima University, Higashihiroshima, 739-8526, Japan;1. Department of Electrical, Electronic, and Information Engineering “Guglielmo Marconi”, University of Bologna, Viale Risorgimento 2, Bologna, 40136, Italy;2. Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, Via Terracini 28, Bologna, 40131, Italy;3. Department of Industrial Chemistry “Toso Montanari”, University of Bologna, Viale Risorgimento 4, Bologna, 40136, Italy;1. Enersol Pty Ltd, 235 Nelson St, Annandale, NSW, 2038, Australia;2. United Nations Population Fund, UN City, Marmorvej 51, 2100 Copenhagen, Denmark |
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| Abstract: | The use of fluorinated ethylene propylene (FEP) foils as engineering materials for aerospace, solar thermal collector and neutrino detector applications has attracted considerable attention in recent decades. Mechanical properties are indispensable for analyzing corresponding structural behavior to meet the demands of safety and serviceability. In this paper, uniaxial tensile tests taking into account loading speeds, uniaxial tensile cyclic tests in terms of stress amplitude and loading cycles and creep tests considering loading stress and time were carried out to characterize mechanical properties. For uniaxial tensile properties, elastic modulus, yield stress, breaking strength and elongation were analyzed in detail. It is found that these mechanical properties except breaking elongation increased with loading speeds and that mechanical properties obtained in transverse direction were more sensitive than those obtained in machine direction. For cyclic properties, elastic modulus and ratcheting strain tended to be stable after certain cycles, demonstrating that cyclic elastic moduli were more suitable for analyzing structural behavior than those obtained in uniaxial tensile experiments. For creep properties, apparent strain at 6 MPa suggested that special attention was necessary for analyzing structural behavior if maximum stress was larger than 6 MPa. In general, this study could provide useful observations and values for understanding mechanical properties of FEP foils. |
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| Keywords: | Creep strain Elastic modulus Fluorinated ethylene propylene (FEP) Mechanical properties Neutrino detector project Ratcheting strain Yield stress |
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