Study on the Fracture Properties of the PMMA Structure for the JUNO Central Detector

Wang, Zongyi; Wang, Yuanqing; Du, X. F.; Zhang, Tianxiong; Yuekun, Heng

doi:10.1007/s12205-019-5562-1

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…The stress in the R direction is the largest, so the node is prone to crack in the direction given in gure 9(a). When Wang [14] and Zhou [17] performed the node A experiments, Some nodes broke at the edge of the appended panel with a stepped structure. Therefore, the transition between the appended panel and the spherical panel should be smooth.…”

Section: Fea Resultsmentioning

confidence: 99%

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Structural Design and Tensile Experiment of Connection Node between acrylic and Stainless Steel

Qian

Yuekun

et al. 2021

Preprint

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Acrylic are widely used as load-bearing structural parts. In this study, the structural design, finite element analysis (FEA) and tensile experiment of the connection node of the acrylic spherical vessel designed for Jiangmen Underground Neutrino Observation (JUNO) are carried out. The acrylic connection node needs to withstand a tensile load of 90 kN for 20 years, and its ultimate bearing capacity is required to be 6 times the working load. Under working load, the stress of the acrylic structure should be less than 3.5 MPa. In the study, a connection node connecting acrylic and stainless steel is designed. By embedding the steel ring in the acrylic structure to connect with the support rod, the acrylic connection node can withstand high loads. A 1/4 symmetric model of connection node is established, and the FEA method is used to solve nonlinear problems such as material nonlinearity and frictional contact. The results of FEA show that the maximum principle stress of the connection node is about 2.92 MPa. By comparing the stress of the FEA results with the experimental results, the relative difference is 7.24 %, indicating that the FEA results are credible. The experiment results also show that the ultimate tensile load of the connection node can reach 1000 kN, which is about 11 times the working load. The breakdown of the connection node occurs at the sharp corner of the groove instead of the maximum stress point. Through the design, simulation and experiment of the connection node, for the brittle materials such as acrylic, the structure should avoid the defects such as sharp corner.

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Section: Fea Resultsmentioning

confidence: 99%

“…At present, there are few designs of high-strength connection structures between acrylic and metal materials. Wang [13,14] designed a connection node with stainless steel plate embedded in an appended acrylic panel, shown in gure 2(a). The steel plate is a bearing structure that can avoid bending moments at the connection node.…”

Section: Introductionmentioning

confidence: 99%

Structural Design and Tensile Experiment of Connection Node between acrylic and Stainless Steel

Qian

Yuekun

et al. 2021

Preprint

Self Cite

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“…Creep refers to the phenomenon that deformation increases with time under the action of a constant force. Additionally, flaws or microcracks significantly affect the mechanical properties of acrylic [28]. Therefore, the stress levels of the acrylic structure must be maintained at low levels.…”

Section: Design Requirementsmentioning

confidence: 99%

Structural design of the acrylic vessel for the Jinping Neutrino Experiment

Wang,

Liu,

Chen

et al. 2024

J. Inst.

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The Jinping neutrino experiment is designed to have multiple purposes in the China Jinping Underground Laboratory. Following the acrylic vessel design requirements proposal, a structural scheme has been developed and optimized. Subsequently, the stability of the acrylic shell structure is calculated using finite element analysis, as well as the load-bearing capacities under various working conditions. Further, the effects of temperature changes, rope failures, and Young's modulus of the ropes on the static behavior of the structure are analyzed. The results indicated that the stress level and structural displacement of the structure scheme satisfy the design requirements, as well as the stability of the vessel under compression. The acrylic vessel is safe in the given working conditions. Temperature is not a controlling factor in structural design. The structural scheme ensures basic safety if one vertical rope, two vertical ropes, or one horizontal rope fails.

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“…At present, there are few designs of high-strength connection structure between acrylic and metal materials. Wang [20,21] designed a connection node with a stainless steel bearing seat embedded in an appended acrylic panel, shown in figure 2(a). The bearing structure can avoid bending moments of the connection node.…”

Section: Introductionmentioning

confidence: 99%

Design and experiment of high load-bearing acrylic connection node for the world's largest acrylic spherical vessel

Qian,

Ma,

Heng

et al. 2023

Mater. Res. Express

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Acrylic is a kind of polymer material and is gradually applied to load-bearing components.The working stress and ultimate bearing capacity of the acrylic structure are the main design indexes. Aiming at the world’s largest acrylic spherical vessel, the structural design, finite element analysis and full-size prototype tensile test of a new acrylic connection node were carried out in this paper.This acrylic node will bear 90 kN tension force for 20 years.According to the viscoelastic characteristics of the material and the working environment, the stress of acrylic should be controlled below 3.5MPa for long term used. At the time, the ultimate bearing capacity should be greater than 6 times the working load.According to the stress-strain curve of acrylic, its tensile strength is about 75MPa. There is no obvious plastic deformation after fracture, showing the material characteristics of brittle fracture.According to the failure analysis of previous acrylic node structures and the characteristics of acrylic, the new acrylic node structure is proposed in this paper. Its performance is improved by reducing the cutting amount of acrylic nodes, optimizing the structure of embedded part and avoiding sharp corners. A 1/4 symmetrical acrylic node model is established FEA software, and the nonlinear problems such as material nonlinearity and friction contact are solved by finite element method. The FEA results show that the maximum principal stress of the node is about 2.9MPa. The relative error between the FEA results and the experimental results is 7.2%, indicating that the FEA results are credible. The ultimate tensile load of the node can reach 1000kN, which is about 11 times the working load. The failure of the node occurs at a sharp corner of the groove, instead of the maximum stress point. Therefore, stress concentration caused by sharp corners should be avoided in the design of acrylic structure.

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Study on the Fracture Properties of the PMMA Structure for the JUNO Central Detector

Cited by 7 publications

References 28 publications

Structural Design and Tensile Experiment of Connection Node between acrylic and Stainless Steel

Structural Design and Tensile Experiment of Connection Node between acrylic and Stainless Steel

Structural design of the acrylic vessel for the Jinping Neutrino Experiment

Design and experiment of high load-bearing acrylic connection node for the world's largest acrylic spherical vessel

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