Numerical analysis of asymmetric fatigue crack growth behaviors of circular notched bar specimen resulting from various geometric misalignments

Ilhyun Kim, Yongjian Zhao, Byoung Ho Choi, Ji Mi Lee, Ki Soo Lee, Jeong Moo Lee

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

The effects of various misalignments of circular notched bar (CNB) specimens on the fatigue crack propagation behavior of pipe grade polyethylene were investigated by finite element analyses. Generally, as the misalignments increased, the asymmetric crack growth accelerated with a consequent decrease in the time taken to reach the critical stress intensity factors. It was therefore confirmed that the lifetime to failure of CNB specimens varies noticeably when they are misaligned. Going by our study results, the fatigue crack growth behavior of CNB specimens, including their lifetime estimations, should be considered by addressing the effects of their misalignments.

Original languageEnglish
Pages (from-to)50-64
Number of pages15
JournalEngineering Fracture Mechanics
Volume108
DOIs
Publication statusPublished - 2013 Aug

Bibliographical note

Funding Information:
The support provided by LG Chem for this work is specially acknowledged. This work was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (MEST) (NRF-331-2008-1-D00005).

Keywords

  • Circular notched bar specimen
  • Fatigue crack growth
  • Fatigue lifetime
  • Geometric misalignment
  • Stress intensity factor

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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