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Analysis of the autofrettage effect in improving the fatigue resistance of automotive CNG storage vessels

Authors
  • Han, Seung-Moo1
  • Hwang, Beom-Cheol2
  • Kim, Ho-Yoon3
  • Kim, Chul2
  • 1 Kyunghee University, Department of Biomedical Engineering, Seoul, 130-731, Korea , Seoul (South Korea)
  • 2 Pusan National University, Research Institute of Mechanical Technology, Jangjeon-dong, Geumjeong-gu, Pusan, 609-735, Korea , Pusan (South Korea)
  • 3 Pusan National University, School of Mechanical Engineering and RIMT, Jangjeon-dong, Geumjeong-gu, Pusan, 609-735, Korea , Pusan (South Korea)
Type
Published Article
Journal
International Journal of Precision Engineering and Manufacturing
Publisher
Korean Society for Precision Engineering
Publication Date
Jan 01, 2009
Volume
10
Issue
1
Pages
15–21
Identifiers
DOI: 10.1007/s12541-009-0003-6
Source
Springer Nature
Keywords
License
Yellow

Abstract

Type II compressed natural gas (CNG) storage vessels for automobiles are becoming widely used. They are not only supplied to automakers in Korea (such as Hyundai Motors), but are being exported overseas in increasing numbers. Autofrettage is a process that produces beneficial residual stresses in a vessel by subjecting it to excessive internal pressure. This strengthens the vessel and improves its fatigue resistance. This paper presents research into the autofrettage process and the residual stresses it produces in type II CNG storage vessels. Finite element analysis and a closed-form equation are used. Fatigue resistance is then analyzed via a fatigue evaluation performed according to ASME section VIII.

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