Research Papers: Design and Analysis

Effect of Precompression on Ovality of Pipe After Bending

[+] Author and Article Information
A. V. Kale

Department of Mechanical Engineering, Yashwantrao Chavan College of Engineering, Hingna Road, Nagpur 441110, Indiakaniḻ1960@yahoo.com

H. T. Thorat

Department of Mechanical Engineering, Visvesaraya National Institute of Technology, Nagpur 440011, Indiahtthorat@yahoo.com

J. Pressure Vessel Technol 131(1), 011207 (Nov 25, 2008) (7 pages) doi:10.1115/1.3027464 History: Received May 01, 2007; Revised February 29, 2008; Published November 25, 2008

Ovality is a main defect in all pipe bending techniques. An objective of the work is to control ovality in pipe bending. A new concept is suggested for reducing the flattening or ovality. Based on the concept, a mechanism is developed for bending pipes. This mechanism has provisions for precompression of the pipe along the directrix of maximum deformation during bending. Experimentation is carried out on this mechanism and dimensions are measured at 13 discrete places along the length of the pipe. Percentage ovality is computed using experimental results. It is justified by using equations of radius and displacement functions. Minimization of potential energy by sequential search method is done. The methodical approach is presented in this paper. Results show that precompression reduces ovality of the pipe after bending.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 2

Proposed concept

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Figure 3

Assembly of mechanism

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Figure 4

Grid pattern on the pipe

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Figure 5

Effect of precompression

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Figure 6

Coordinate system used in the analysis

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Figure 7

Deformed cross section of the pipe after bending

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Figure 8

Comparison of experimental and analytical results for Group A and B pipes

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Figure 9

Comparison of experimental and analytical results for Group C and D pipes



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