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Research Papers: Design and Analysis

Loading Analysis on the Thread Teeth in Cylindrical Pipe Thread Connection

[+] Author and Article Information
Shou-Jun Chen

School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai 200237, P. R. Chinacsj19850112@yahoo.com.cn

Qi An1

School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai 200237, P. R. Chinaanqi@ecust.edu.cn

Yi Zhang

 Wuxi Seamless Oil Pipe Co., Ltd., Wuxi 214028, P. R. China

Lian-Xin Gao

School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai 200237, P. R. China

Qiang Li

School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Xuhui District, Shanghai 200237, P. R. Chinallqq0108@msn.cn

1

Corresponding author

J. Pressure Vessel Technol 132(3), 031202 (May 04, 2010) (8 pages) doi:10.1115/1.4000729 History: Received April 06, 2009; Revised November 18, 2009; Published May 04, 2010; Online May 04, 2010

This paper presents a new analytical method that can calculate the load distribution on the thread teeth in cylindrical pipe threaded connection. The new method was developed by analyzing each male and female thread tooth from the connection on the basis of elastic mechanics. By using this method, the load distribution on each thread tooth can be calculated with the tightening torque and thread numbers. By applying the new method on the sample of API 88.9 mm round threaded connection, the obtained results show that the load on thread tooth mainly concentrates on the last four or five threads engaged. By using the finite element analysis method to the same sample validates the new method. The new method proposed in this paper is practical and convenient because it can be applied to calculate the load and deformation on each thread tooth just with tightening torque and thread numbers, which is easier to implement in practice.

FIGURES IN THIS ARTICLE
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Copyright © 2010 by American Society of Mechanical Engineers
Topics: Stress , Thread , Deformation
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Figures

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Figure 1

The schematic of round threaded connection

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Figure 2

Load and deformation on last male thread tooth

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Figure 3

Loading analysis on each male thread tooth: (a) thread 1, (b) thread i-1, and (c) thread n

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Figure 4

Loading analysis on the left side of last male thread tooth

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Figure 5

Loading analysis on the right side of last male thread tooth

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Figure 6

Loading analysis on last female thread tooth: (a) thread n, (b) the left side, and (c) the right side

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Figure 7

Load distribution on thread tooth by the new method proposed in this paper

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Figure 8

Finite element model of API 88.9 mm round threaded connection

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Figure 9

The schematic of finite element model after cutting

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Figure 10

Mesh on the finite element model

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Figure 11

Refined mesh at teeth edges: (a) middle region and (b) end region

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Figure 12

Stress distribution on the thread teeth in ANSYS

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Figure 13

Mean contact stress obtained by analytical method and finite element method

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