scholarly journals Study on the Physical Properties of Split-type Iron Base Shape Memory Alloy Pipe Joint

2021 ◽  
Vol 2083 (2) ◽  
pp. 022072
Author(s):  
Yun Tian ◽  
Qi Yao ◽  
Dong Jiang ◽  
Yanni Xiao ◽  
Licheng Liu ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Pipeline System ◽  
Pull Out ◽  
Pressure Pipeline ◽  
Pipe Joints ◽  
Iron Based ◽  
Pulling Force ◽  
Pipe Joint

Abstract Aiming at the leakage phenomenon of pipeline system due to corrosion and other reasons, a split type iron-based shape memory alloy pipe joint based on the button bond connection was designed for repair. This split-type pipe joint can be used for quick in-situ maintenance of pipelines without cutting off pipelines or stopping transmission without pressure relief. It is especially suitable for intensive pipeline maintenance and online emergency maintenance. In order to study the connection performance of the split iron-based shape memory alloy pipe joint, this paper took the Fe17Mn4Si10Cr4Ni alloy pipe joint as the research object, and carried out pressure sealing and pull-out experiments respectively on the integral pipe joint and the split pipe joint which had not been carried out and had been subjected to one heat and mechanical training. The results showed that, compared with the integral pipe joint, the pressure seal value of the split pipe joint decreased by 40% to 20MPa and the pulling force decreased by 48.9% without heat-mechanical training. However, after 1 time of thermal-mechanical training, the pressure sealing value of the split-type pipe joint decreased by 12.5% to 32MPa and the pulling force decreased by 21.2% compared with the integral pipe joint. It can be seen that thermal-mechanical training can significantly improve the joint performance of split pipe joints, and the split pipe joint can meet the requirements of medium and low pressure pipeline connection and maintenance.

scholarly journals Finite Element Simulation of NiTiNb Shape Memory Alloy Pipe-Joint Subjected to Coupled Transformation and Plastic Deformation

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Xiang Chen ◽  
Bin Chen ◽  
Xianghe Peng ◽  
Xiaoqing Jin ◽  
Ying Ma ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Phase Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
High Performance ◽  
Coupling Effect ◽  
Longitudinal Direction ◽  
Design Parameters ◽  
Pull Out ◽  
Pipe Joint

The assembling process of Ni47Ti44Nb9 alloy pipe joints considering the phase transformation and plasticity was numerically simulated for the first time with a developed constitutive model. The simulated process was based on the experimental material parameters, which were determined with the experimental tensile results of Ni47Ti44Nb9 shape memory alloy (SMA) and steel bars. The results showed that, after assembly, the Mises stress distributed uniformly along the longitudinal direction of the NiTiNb joint, but nonuniformly along the radial direction. The maximum σeq does not appear at the inner wall of the joints due to the coupling effect of the plastic deformation and the recoverable transformation. The contact pressure distributed uniformly along the circumferential direction, but nonuniformly along the longitudinal direction. The sizes of the SMA joint and the pipe should be properly matched to ensure contact during the stage of the rapid reverse phase transformation to obtain stable connection performance. The pull-out force was also computed, and the results were in good agreement with the experimental results. The results obtained can provide available information for the optimization of the design parameters of the high-performance SMA pipe-joint, such as inner diameter and assembly clearance.

Shape Memory Alloy Pipe-Joint with Copper Coating

2005 ◽  
Vol 475-479 ◽  
pp. 1957-1960
Author(s):  
Lei Wang ◽  
De Sheng Yan ◽  
Zhi Min Jiang ◽  
Li Jian Rong
Keyword(s):  
Shape Memory Alloy ◽  
Liquid Nitrogen Temperature ◽  
Tensile Tests ◽  
Copper Coating ◽  
Pull Out ◽  
Gas Leak ◽  
Inner Surface ◽  
Pipe Joints ◽  
Leak Tightness ◽  
Pipe Joint

In order to improve the performance of pipe couplings, a technique has been developed to electroplate copper on the inner surface of Ni-Ti-Nb pipe-joints after pre-deformation. Gas leak tightness and tensile tests were conducted to evaluate the performance of the couplings both with and without copper coating. It was found that electroplating a thin copper layer on the inner surface of the pipe-joint effectively solved the problem of leakage and greatly enhanced the pull-out force of the couplings. Furthermore, the pipe-joints without ribs can be demounted easily after being cooled to the liquid nitrogen temperature and benefit the maintenance of the pipeline.

Research of Pipe Made of Cu-Zn-Si Shape Memory Alloy to Internally Sprayed Pipe Connection in Connected Technology

2014 ◽  
Vol 484-485 ◽  
pp. 105-109
Author(s):  
Shao Yun An
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Basic Principle ◽  
Influence Factors ◽  
Corrosion Damage ◽  
Experimental Results ◽  
Oil Pipeline ◽  
Oil Pipelines ◽  
Pipe Joints ◽  
Pipe Joint

The copper-based shape memory alloy pipe joint was applied in the field of oil pipelines jointing as well as installing. It has many advantages than anything. In the paper, the basic principle and connection influence factors of copper-based shape memory alloy pipe joint were described. Experimental results shows the copper-based shape memory alloy pipe joints can be used in oilfield oil pipeline connection and it can solve the inner pipe joint corrosion damage problem by welding.

Predicting for Connecting Strength of Shape Memory Alloy Pipe-Connector

2011 ◽  
Vol 396-398 ◽  
pp. 912-915
Author(s):  
Ding Yuan Li ◽  
Fu Liu ◽  
Gang Li
Keyword(s):  
Theoretical Model ◽  
Stress State ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Iron Based ◽  
Increasing Temperature ◽  
Pipe Joint

A theoretical model is established in order to analyze the stress state and estimate the connecting strength of the iron-based shape memory alloy pipe-connector. The effect of the temperature on the connecting strength is investigated using this model. The results show that the enclasp force of pipe joint P and maximal stresses of pipe and pipe joint ( , ) decreases linearly as increasing temperature. P and ( , ) decrease as increasing the thickness of the pipe joint, the decrease of is less than that of . Therefore, the thickness of the pipe joint is small as much as possible in order to enhance the enclaspe force.

Methods of Improving Shape Memory Effect of FeMnSiCr Alloy Pipe Joint

2011 ◽  
Vol 299-300 ◽  
pp. 440-443
Author(s):  
Xing Jiang Liu ◽  
Jian Zhong Wang ◽  
Jin Gang Qi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Engineering Application ◽  
Pulling Force ◽  
Pipe Joint

The influence of different broaching rate, the training of thermo-mechanical cycle and Electro-pulse Modification (EPM) on the shape memory effect of the FeMnSiCr alloy was investigated. The recovery pulling force can be realized as high as 22850N after EPM treatment. The Fe-based shape memory alloy (SMA) pipe joint can meet the requirement of engineering application.

scholarly journals In situ W–NiTi shape memory alloy composite of high radiopacity

2014 ◽  
Vol 81 ◽  
pp. 4-7 ◽  
Author(s):  
S. Wang ◽  
F.M. Guo ◽  
D.Q. Jiang ◽  
Y. Liu ◽  
L.S. Cui
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Niti Shape Memory Alloy ◽  
Alloy Composite
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