Stable crack extension through AISI 4340 steel: Experimental investigation

A. H.I. Mourad, M. G. Alghafri, O. A.Abu Zeid

Research output: Contribution to journalConference articlepeer-review

24 Citations (Scopus)


The stable crack growth (SCG) through AISI 4340 steel alloy was investigated experimentally under mode-I and mixed-mode (I and II) loading. A pre notch of 0.05 mm root radius was introduced in the specimen through electro discharge machining (EDM) wire cutting technique. Different combinations of loading angles ψ and original crack length to specimen width (a o/W) ratio were examined. Data concerned with direction of initial crack extension load-load line displacement (L-LLD) diagrams, initiation and maximum loads, range of stable crack growth, crack blunting, crack front geometry, fracture surfaces, and scanning electron microscope fractographs were obtained. A noticeable blunting was observed prior to the crack initiation. Although the crack initiates from a straight front, a considerable crack front tunnelling was observed as the crack proceeds. In a mixed mode, the crack extension takes place initially almost along a straight path inclined with the main crack. The loading angle and initial crack length affect the initiation and maximum load significantly, however the ratio between Pmax and Pi remains almost constant.

Original languageEnglish
Pages (from-to)207-212
Number of pages6
JournalKey Engineering Materials
Issue numberI
Publication statusPublished - 2004
EventAdvances in Fracture and Failure Prevention: Proceedings of the Fifth International Conference on Fracture and Strength of Solids (FEOFS2003): Second International Conference on Physics and Chemistry of Fracture and Failure Prevention (2nd ICPCF) - Sendai, Japan
Duration: Oct 20 2003Oct 22 2003


  • Crack growth through AISI steel
  • Stable crack growth

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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