Novel technique for normalizing load-displacement curves in fracture testing

A. H.I. Mourad, Aladdin Abu-Assi, Fahmy M. Haggag, Yuh J. Chao

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Fracture experiments conducted as part of research on stable crack behavior in low alloy steel (EN 34NiCrMo6) are analyzed and presented. CT specimensof low constraint (section slenderness ratio, b0/B∼6), with various crack depth and different loading angles, φ, were investigated. Analysis of the loaddisplacement curves revealed that the initiation load is found to be the same when normalized to the maximum load, Pmax. The load-line displacement ΔLL at PmaxPmax) was also found to have a single value. Hence the load displacement curves were presented as a unique normalized P-ΔLL curve. These normalized curves demonstrate having a single "representative/trend" curve that characterises the stable crack growth behavior. The proposednormalization technique was also applied to additional literature data on different materials with various specimen configurations and loading modeswith success. This technique could also be useful in studying the fracture of low constraint specimens and contributing to the transferability issue forstructural application.

Original languageEnglish
Pages (from-to)1-20
Number of pages20
JournalMaterials Performance and Characterization
Issue number3
Publication statusPublished - Jun 18 2014


  • Ductile crack growth
  • Low constraint specimens
  • Mixed-mode fracture
  • Normalized load displacement curves
  • Thickness-independent load displacement curve

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Polymers and Plastics
  • Metals and Alloys


Dive into the research topics of 'Novel technique for normalizing load-displacement curves in fracture testing'. Together they form a unique fingerprint.

Cite this