IntroductionSince Wolfgang E. Pauli, the Austrian physicist, firstly predicted the existence of neutrinos, scientists from all over the world started to investigate neutrinos. As the basis of neutrino experiments, the neutrino detector was also intensively investigated by scholars. Numerous kinds of neutrino detectors have been established worldwide and they can roughly be classified into four types in structure: cylindrical structure [1], acrylic spherical structure [2], balloon (thin membrane) structure [3] and linetype structure [4,5]. For the detectors with the structure of acrylic sphere, the SNO detector [2] is the most typical one, which is located at 2039 m underground and has the diameter of 12 m and the ability to contain 1 kilotons of detecting liquid. Arthur B. McDonald, the chief scientist of SNO neutrino experiment successfully won the 2015 Noble Prize in Physics. The JUNO central detector will adopt the acrylic spherical structure as well and be supported by a stainless steel latticed shell. Its diameter will be 35.5 m and the capacity will reach 20 kilotons. In view of the huge scale, the bearing capacity of the structure is of high requirement. In the working condition, the maximum Mises stress of large areas on the acrylic can not exceed 5 MPa and that of local parts should be limited within 10 MPa [6]. Moreover, the structure must be safe and reliable under the effects of external factors.Besides, the connecting joint of the acrylic and stainless steel is the key studying issue, since it directly relates to the safety of the whole structure. Researches about the acrylic (polymethyl methacrylate, PMMA) and stainless steel have been carried out in depth by many scholars. Among them, Wu et al. [7] compared test results of PMMA under the tensile loading at intermediate strain rates (2.92 × 10 −1 , 6.54 × 10 −1 , 2.81, 18.6 s −1 )
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