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Assembly Performance Simulation of NiTiNb Shape Memory Alloy Pipe Joint Considering Coupling Effect of Phase Transformation and Plastic Deformation |
CHEN Xiang1,2,3,CHEN Wei1,ZHAO Yang1,LU Sheng1,3,JIN Xiaoqing2,PENG Xianghe2() |
1. School of Advanced Manufacturing Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China 2. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China 3. State Key Laboratory for Strength and Vibration of Mechanical Structural, Xi'an Jiaotong University, Xi'an 710049, China |
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Cite this article:
CHEN Xiang,CHEN Wei,ZHAO Yang,LU Sheng,JIN Xiaoqing,PENG Xianghe. Assembly Performance Simulation of NiTiNb Shape Memory Alloy Pipe Joint Considering Coupling Effect of Phase Transformation and Plastic Deformation. Acta Metall Sin, 2020, 56(3): 361-373.
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Abstract The pipe joints based on shape memory alloy (SMA) are widely used in various fields of fluid transport by virtue of their simple structure, easy assembly and high reliability. However, due to the complexity of the NiTiNb constitutive model, the plastic deformation and its effects have yet not been considered in the report of pipe joint connection system. In view of this background, this work constructs an SMA joint-steel pipe system (J-P system) and performs the finite element numerical simulation of the assembling process based on an SMA phenomenological constitutive model, where in the plastic-phase transformation coupling effect is considered. By altering the diameter expansion, wall thickness, service temperature and critical phase transformation, the change features of the von Mises stress, contact pressure and pull-out force of the J-P system are investigated. The results show that due to the coupling effect of phase transformation and plastic deformation, the evolution of Mises stress, equivalent transformation strain and equivalent plastic deformation in SMA joint show obvious regularity during assembly: in the loading stage, the phase transformation strain and plastic deformation increase with the increase of predeformation. At each subsequent loading step, the plastic strain remains unchanged. At the unloading stage, von Mises stress decreases and phase transformation strain remains unchanged. With temperature increase, the phase transformation strain decreases significantly and von Mises stress increases. At subsequent loading steps, von Mises stress and phase transformation strain remains unchanged. Within a certain size, the pull-out force decreases with the increase of diameter expansion; Among the 9 schemes with different wall thickness ratios, the pull-out force changes non-linearly with the wall thickness, and there is an optimal connection performance scheme. Within the range of room temperature (0~40 ℃), the service temperature has little impact on the performance of the J-P system; With the increase of the critical phase transformation, the stress concentration layer within the SMA joint moves from the inside to the outside, and the pull-out force increases gradually within the range of the critical phase transformation from 0.07 to 0.14. The results also show that the stress concentration at the end of contact region can significantly increase the pull-out force of the J-P system.
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Received: 18 June 2019
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Fund: National Natural Science Foundation of China(11802047);National Natural Science Foundation of China(51807019);Foundation and Frontier Projects in Chongqing City(cstc2016jcyjA0594);Foundation and Frontier Projects in Chongqing City(cstc2016jcyjA0443);Open Fund of State Key Laboratory for Mechanical Transmission(SKLMT-KFKT-201711);Open Fund of State Key Laboratory for Strength and Vibration of Mechanical Structures(SV2018-KF-28) |
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