Structure design and compression experiment of the supporting node for JUNO PMMA detector
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ORIGINAL PAPER
Structure design and compression experiment of the supporting node for JUNO PMMA detector Xiaohui Qian1,2,3 · Xiaoyan Ma1,2 · Yuekun Heng1,2,3 · Wei He1 · Zhonghua Qin1,2 · Yuesheng Tang4 · Jianxia Xiao4 · Gaofeng Zhang4 · Wei Cheng4 · Lei Li4 · Jian Tang5 · Tao Chen6 · Chang Liu6 · Zian Zhu1,3 · Shaojing Hou1 · Yatian Pei1 · Xiaoyu Yang1 Received: 7 May 2020 / Revised: 22 June 2020 / Accepted: 7 July 2020 / Published online: 11 August 2020 © Institute of High Energy Physics, Chinese Academy of Sciences 2020
Abstract Introduction Jiangmen Underground Neutrino Observation is going to build a huge polymethyl methacrylate (PMMA) detector to hold 20,000 tons of liquid scintillator to capture neutrinos in a 700-m underground cave. This PMMA detector has a spherical shape with an inner diameter of 35.4 m and is supported by an outside stainless steel structure through 590 supporting nodes. The maximum compression force applied to these supporting nodes would be about 150 kN when the detector is running. Method This paper focuses on the design and validation of the PMMA supporting node and compares the effects of two gaskets (round gasket and ring gasket) on the supporting node stress and ultimate compression load. An innovative PMMA supporting node structure is first proposed, and a 1/4 symmetric model with the material nonlinearity and frictional contact boundary is established in the finite element analysis (FEA). Results The FEA results show that the principal stress of the structure is less than 3.5 MPa and the Mises stress is less than 5.5 MPa. The stress and deformation at the groove of the supporting node using the ring gasket are smaller than that using the round gasket. The compression experiments of the supporting node using two types of gaskets were conducted to study the effect of gaskets on the ultimate compression load of supporting node. The ultimate compression load of the supporting node with ring gasket is larger than 900 kN, which is six times of design load. In a comparison of experimental results with FEA, the maximum difference is 15.78%, demonstrating the validity of FEA results. Through the material test of PMMA and experiment of the PMMA supporting node, it is known that PMMA is a brittle material and it is very sensitive to sharp corner defects that should be avoided in the design of PMMA structure. Keywords JUNO · PMMA detector · PMMA supporting node · Compression experiment · Brittle material
Introduction PMMA, also known as acrylic or plexiglass, is a polymer synthesized from methyl methacrylate monomer [1]. Due to its high light transmittance and low radioactive background, it is often selected as the main structure material of the detector in particle physics experiments [2–6]. One of the most famous detectors is Sudbury Neutrino Observatory (SNO) [2, 7] in Canada, which built a 12-m-diameter acrylic * Xiaoyan Ma [email protected] * Yuekun Heng [email protected] Extended author information available on the last page of the article
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