Creep behavior and lifetime prediction of PMMA immersed in liquid scintillator |
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| Institution: | 1. Institute of Process Equipment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;2. Institute of High Energy Physics Chinese Academy of Sciences, Beijing 100049, China;1. Structural Impact Laboratory (SIMLab), Department of Structural Engineering, NTNU, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway;2. SINTEF Materials and Chemistry, Department of Materials and Nanotechnology, PB 124 Blindern, NO-0314, Oslo, Norway;1. Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University, Jinju 660-701, Republic of Korea;2. Department of Mechanical Engineering, The University of Utah, Salt Lake City, UT 84112, USA;1. Department of Engineering Mechanics, Applied Mechanics Laboratory, Tsinghua University, Beijing 100084, China;2. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing Institute of Aeronautical Materials, Beijing 100095, China;1. Department of Polymer Science and Engineering, Hannam University, Daejeon 305-811, Republic of Korea;2. Underground Solutions Inc., Poway, CA, USA |
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| Abstract: | The creep behavior of PMMA immersed in liquid scintillator at room temperature was experimentally studied with a new type of creep test machine. Both short-term and creep-rupture tensile tests at eight stress levels were performed. A master curve of creep compliance at a reference stress was obtained according to the Time-Stress Superposition Principle. The master curve was compared with the actual long-term creep curve. It demonstrates that the two curves coincide well at short times. However, the actual creep data shows a higher creep rate as time goes on. The actual lifetime is much shorter than that predicted by the master curve. Furthermore, the relationship between long-term creep limited strength and service life was determined. The results can be used to guide the safety design of PMMA vessels for application in a neutrino observatory. |
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| Keywords: | Creep PMMA Time-Stress Superposition Principle Master curve Lifetime prediction |
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