Moire interferometry analysis of fiber debonding

T. C. Easley*, K. T. Faber, Surendra P Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Progressive fiber debonding in steel fiber/cementitious matrix composites has been studied using a single fiber pullout test that permits simultaneous measurements of the load versus crack opening displacement relationship and Moiré interferometry fringe patterns. Analysis of Moiré interferometry patterns allows the fiber axial and interfacial shear stresses to be calculated along the entire fiber length. The interfacial shear stress distribution along the debonded length of the fiber indicates a steep decrease in shear stress with interfacial slip, from 6 to 1 MPa for 7 μm of fiber slip and a crack opening displacement of 22 μm. These results suggest that improvements in the toughness of cement-based composites could be achieved by developing materials in which the decrease in shear stress is less severe.

Original languageEnglish (US)
Pages (from-to)625-629
Number of pages5
JournalJournal of Engineering Mechanics
Issue number6
StatePublished - Jun 1 2001

ASJC Scopus subject areas

  • Mechanical Engineering

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