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Ultrasonic Welding of Magnesium–Titanium Dissimilar Metals:A Study on thermo-mechanical analyses of Welding Process by Experimentation and Finite Element Method

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Chinese Journal of mechanical Engineering 2019年第6期32卷 181-191页

作者： Dewang Zhao Daxin Ren Kunmin Zhao Pan Sun Xinglin Guo Liming Liu School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China School of Automotive Engineering Dalian University of TechnologyDalian 116024China Institute of Industrial and Equipment Technology Hefei University of TechnologyHefei 230601China Shanghai Shipyard Co. Ltd.Shanghai 200000China Department of Engineering Mechanics State Key Laboratory of Structural Analysis for Industrial EquipmentDalian University of TechnologyDalian 116024China

Ultrasonic welding is an effective ways to achieve a non-reactive/immiscible heterogeneous metal connection, such as the connection of magnesium alloy and titanium alloy. But the thermal mechanism of magnesium alloy/titanium alloy ultrasonic welding has not been defined clearly. In this paper, the experimental and the finite element analysis were adopted to study the thermal mechanism during welding. Through the test, the temperature variation law during the welding process is obtained, and the accuracy of the finite element model is verified. The microscopic analysis indicates that at the welding time of 0.5 s, the magnesium alloy in the center of the solder joint is partially melted and generates the liquid phase. Through the finite element analysis, the friction coefficient of the magnesium–titanium ultrasonic welding interface can be considered as an average constant value of 0.28. The maximum temperature at the interface can exceed 600 ℃ to reach the melting point temperature of the magnesium alloy. The plastic deformation begins after 0.35 s and occurs at the magnesium side at the center of the interface.

关键词： Ultrasonic welding Magnesium alloys Titanium alloys thermo-mechanical analyses Finite elementanalysis

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Structural integrity evaluation of irradiated LEU targets for the production of molybdenum‑99 using thermo‑mechanical behavior simulation coupled with pressure of fission gas release calculation

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Nuclear Science and Techniques 2022年第12期33卷 12-23页

作者： N.Mellel B.Mohammedi M.Salhi M.Dougdag S.Missaoui S.Hanini Birine Nuclear Research Center PB 18017200 Ain OusseraDjelfaAlgeria LBMPT UniversitéDr Yahia Farès 26000 MédéaAlgeria

Irradiated low-enriched uranium as target plates is used to produce,via neutron radiation and from the molybdenum-99 fission product,technetium-99m,which is a radio-element widely used for diagnosis in the field of nuclear medicine.The behavior of this type of target must be known to prevent eventual failures during radiation.The present study aims to assess,via prediction,the thermal–mechanical behavior,physical integrity,and geometric stability of targets under neutron radiation in a nuclear reactor.For this purpose,a numerical simulation using a three-dimensional finite element analysis model was performed to determine the thermal expansion and stress distribution in the target cladding.The neutronic calculation results,target material properties,and cooling parameters of the KAERI research group were used as inputs in our developed model.Thermally induced stress and deflection on the target were calculated using Ansys-Fluent codes,and the temperature profiles,as inputs of this calculation,were obtained from a CFD thermal–hydraulic model.The stress generated,induced by the pressure of fission gas release at the interface of the cladding target,was also estimated using the Redlich–Kwong equation of state.The results obtained using the bonded and unbonded target models considering the effect of the radiation heat combined with a fission gas release rate of approximately 3%show that the predicted thermal stress and deflection values satisfy the structural performance requirement and safety design.It can be presumed that the integrity of the target cladding is maintained under these conditions.

关键词： Irradiated LEU target Mo-99 production Integrity evaluation thermo-mechanical analyses Fission gas pressure

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