Influence Rule of Annular Notch Geometric Parameter on the Tubing Surface: A Case Study

Renfeng Zhao; Weicheng Gao; Dongya Zhang; Xudong Xiao; Yanwei Liu; Runze Pan; Hongwei Fan

doi:10.3390/met12060996

Metals (Jun 2022)

Influence Rule of Annular Notch Geometric Parameter on the Tubing Surface: A Case Study

Renfeng Zhao,
Weicheng Gao,
Dongya Zhang,
Xudong Xiao,
Yanwei Liu,
Runze Pan,
Hongwei Fan

Affiliations

Renfeng Zhao: School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China
Weicheng Gao: School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China
Dongya Zhang: School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China
Xudong Xiao: School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China
Yanwei Liu: School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China
Runze Pan: School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China
Hongwei Fan: Shaanxi Key Laboratory of Mine Electromechanical Equipment Intelligent Monitoring, School of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

DOI: https://doi.org/10.3390/met12060996
Journal volume & issue: Vol. 12, no. 6
p. 996

Abstract

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In regards to the problem of tubing precision separation, the high-efficiency precision separation method for tubing under eccentric wheel high-speed rotational bending fatigue loading is proposed, which aims to promote the initiation of fatigue cracks at the root of the annular V-notch on the tubing surface. Research on the stress concentration effect of the annular notch on the tubing surface is carried out. The design of the notch takes into account the characteristics of tubing precision separation. The numerical simulation calculation includes four kinds of notches, namely, annular V-notch, annular U-notch, asymmetric V-notch towards the blanking end direction 45°, and asymmetric V-notch away from the blanking end direction 45°. The crack propagation lengths produced by each notch under the same experimental conditions are investigated experimentally. According to the findings, the annular V-notch is suitable for this separation method. By analyzing the theoretical stress concentration factor of the annular V-notch on the tubing surface, three main parameters affecting the annular V-notch root stress field are determined, namely, notch angle, notch depth, and notch root base angle radius. Through calculation and analysis, the influence law of tubing annular V-notch angle, notch depth, and notch root base angle radius on the stress concentration effect is obtained. Based on the process characteristics of tubing precision separation, the ideal tubing annular V-notch geometric parameter is presented within a reasonable value range. For the validation experiment of tubing precision separation, 45# steel, 304 stainless steel, and T2Y copper tube are selected, respectively. Finally, a great tubing precision separation effect is achieved, which verifies the reasonable selection of the tubing surface annular V-notch geometric parameter.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

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