Effect of misalignments of a polyethylene circular notched bar specimen on the asymmetric fatigue crack growth behavior

Ilhyun Kim, Youngjian Zhao, Byoung-Ho Choi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the effect of various misalignments of the circular notched bar (CNB) specimens on the fatigue crack propagation behavior of pipe grade polyethylene is investigated by three dimensional numerical analyses. The effect of the asymmetric crack growth of the misaligned CNB specimens on the lifetime to failure is also addressed. Two types of misalignments of the CNB specimen, i.e., (a) a concentric misalignments (Case I) and (b) an angular misalignments (Case II), are considered using finite element analysis. It is observed that as the misalignments increase, the asymmetric crack growth is accelerated so that the time to reach the critical SIF decreases. Therefore, it can be understood that the lifetime to failure of CNB specimens can vary noticeably once the CNB specimen is misaligned initially. Considering results from this study, the fatigue crack growth behavior including the estimation of the lifetime of CNB specimens should addressed by considering the misalignment effects.

Original languageEnglish
Title of host publicationSociety of Plastics Engineers - EUROTEC 2011 Conference Proceedings
Publication statusPublished - 2011 Dec 1
EventEUROTEC 2011 Conference, in Conjunction with EQUIPLAST - Barcelona, Spain
Duration: 2011 Nov 142011 Nov 15

Other

OtherEUROTEC 2011 Conference, in Conjunction with EQUIPLAST
CountrySpain
CityBarcelona
Period11/11/1411/11/15

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Keywords

  • Circular notched bar (CNB)
  • Fatigue lifetime
  • Misalignment

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Kim, I., Zhao, Y., & Choi, B-H. (2011). Effect of misalignments of a polyethylene circular notched bar specimen on the asymmetric fatigue crack growth behavior. In Society of Plastics Engineers - EUROTEC 2011 Conference Proceedings