Characterization of the fatigue crack behavior of pipe grade polyethylene using circular notched specimens

Yongjian Zhao, Byoung-Ho Choi, Alexander Chudnovsky

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Several standard tests have been widely used for evaluating the pipe grade polyethylene with respect to toughness and lifetime. However, some of these tests turn to be not adequate for new generation of high performance pipe grade polyethylene: the testing takes extremely long time, which makes it impractical. Recently, it has been proposed to use the circular notched specimen (CNS) for studying the crack growth resistance of pipe grade polyethylene. In CNS the stress intensity factor (SIF) increases with crack size much faster than in commonly used test specimens like compact tension (CT) specimen for instance. Thus, CNS may be a good candidate for an accelerated testing as long as it allows reproducing the mechanisms of slow crack growth (SCG) in field conditions. The objectives of the present studies are twofold: (1) to compare pipe grade polyethylene materials with respect to fracture resistance using CNS in order to complete the program in a relatively short time; and (2) to evaluate the applicability of CNS for studies of slow crack growth kinetics. Fatigue crack growth resistance of four PE resins is evaluated in this work. The fracture surfaces after CNS failure, are analyzed by means of optical and scanning electron microscopy (OM and SEM) in order to determine the mechanism of SCG. The effect of load level, stress ratio (R) and notch depth is also studied using CNS. In addition, some technical issues associated with CNS testing are discussed.

Original languageEnglish
Pages (from-to)26-35
Number of pages10
JournalInternational Journal of Fatigue
Volume51
DOIs
Publication statusPublished - 2013 Mar 25

Fingerprint

Fatigue Crack
Crack Growth
Polyethylene
Polyethylenes
Crack propagation
Pipe
Testing
Accelerated Testing
Scanning electron microscopy
Fatigue Crack Growth
Toughness
Growth kinetics
Notch
Stress Intensity Factor
Scanning Electron Microscopy
Fatigue crack propagation
Stress intensity factors
Fracture toughness
Loads (forces)
Lifetime

Keywords

  • Circular notched specimen
  • Crack initiation
  • Fatigue crack
  • Pipe grade polyethylene
  • Process zone

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Modelling and Simulation

Cite this

Characterization of the fatigue crack behavior of pipe grade polyethylene using circular notched specimens. / Zhao, Yongjian; Choi, Byoung-Ho; Chudnovsky, Alexander.

In: International Journal of Fatigue, Vol. 51, 25.03.2013, p. 26-35.

Research output: Contribution to journalArticle

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