Strain evolution after fiber failure in a single-fiber metal matrix composite under cyclic loading

Jay C. Hanan*, Sivasambu Mahesh, Ersan Üstündag, Irene J. Beyerlein, Geoffrey A. Swift, Bjørn Clausen, Donald W. Brown, Mark A.M. Bourke

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The evolution of in situ elastic strain with cyclic tensile loading in each phase of a single Al2O3-fiber/aluminum-matrix composite was studied using neutron diffraction (ND). An analytical model appropriate for metal matrix composites (MMCs) was developed to connect the measured axial strain evolution in each phase with the possible micromechanical events that could occur during loading at room temperature: fiber fracture, interfacial slipping, and matrix plastic deformation. Model interpretation showed that the elastic strain evolution in the fiber and matrix was governed by fiber fracture and interface slipping and not by plastic deformation of the matrix, whereas the macroscopic stress-strain response of the composite was influenced by all three. The combined single-fiber composite model and ND experiment introduces a new and quick engineering approach for qualifying the micromechanical response in MMCs due to cyclic loading and fiber fracture.

Original languageEnglish
Pages (from-to)33-42
Number of pages10
JournalMaterials Science and Engineering: A
Volume399
Issue number1-2
DOIs
Publication statusPublished - 15 Jun 2005
Externally publishedYes

Funding

Funding was provided by the National Science Foundation (CAREER grant no. DMR-9985264) at Caltech and a Laboratory-Directed Research and Development Project (no. 2000043) at Los Alamos. The neutron diffraction experiments were conducted at the Lujan Center, LANSCE, a national user facility supported by the Department of Energy, Office of Basic Energy Sciences under contract W-7405-ENG-36. Dr. C. Brian Hooper assisted with the radiographic measurements.

FundersFunder number
Laboratory-Directed Research and Development Project2000043
Los Alamos
National Science FoundationDMR-9985264
U.S. Department of Energy
Basic Energy SciencesW-7405-ENG-36

    Keywords

    • Composite deformation
    • Fiber failure
    • Interface shear
    • Metal matrix composites
    • Micromechanical events
    • Neutron diffraction

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