Observations and analysis of fatigue crack growth in circular notched polyethylene specimens

Byoung-Ho Choi, Ilhyun Kim, Yongjian Zhao, Ji Mi Lee, Alexander Chudnovsky

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

1 Citation (Scopus)

Abstract

Many fundamental as well as technical issues with PENT (ASTM F2136) are identified, for instance the inability of separating crack growth from crack initiation, too long duration of the test for new generation of PE, outdated test conditions unchanged since the original formulation designed for old PE materials, etc. Therefore, there is a quest for a new accelerated test method. Recently, a circular notched specimen (CNS) has been proposed as an accelerated fatigue testing. However, formation of an asymmetric crack in CNS and early transition to a ductile failure limit the applicability of CNS test for studies of SCG. There are several factors responsible for the asymmetry of SCG. Especially, geometric misalignments of CNS are the most common practical weakness of the test. The present paper reports the observation of asymmetric SCG in CNS under fatigue conditions and analysis by finite element method (FEM) of the CNS misalignments effect on the crack growth asymmetry. Root causes of the asymmetric crack growth and its effect on the time to failure (fatigue lifetime) are discussed.

Original languageEnglish
Title of host publication13th International Conference on Fracture 2013, ICF 2013
PublisherChinese Society of Theoretical and Applied Mechanics
Pages4026-4035
Number of pages10
Volume5
Publication statusPublished - 2013 Jan 1
Event13th International Conference on Fracture 2013, ICF 2013 - Beijing, China
Duration: 2013 Jun 162013 Jun 21

Other

Other13th International Conference on Fracture 2013, ICF 2013
CountryChina
CityBeijing
Period13/6/1613/6/21

Keywords

  • Circular notched specimen
  • Crack growth
  • Crack path
  • Fatigue
  • Polyethylene

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Choi, B-H., Kim, I., Zhao, Y., Lee, J. M., & Chudnovsky, A. (2013). Observations and analysis of fatigue crack growth in circular notched polyethylene specimens. In 13th International Conference on Fracture 2013, ICF 2013 (Vol. 5, pp. 4026-4035). Chinese Society of Theoretical and Applied Mechanics.