Local Mechanical Behavior of Steel Exposed to Nonlinear Harmonic Oscillation

D. P. Cole*, E. M. Habtour, T. Sano, S. J. Fudger, S. M. Grendahl, Anshuman Dasgupta

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    10 Citations (Scopus)

    Abstract

    The local mechanical behavior of fatigued steel specimens was probed using nanoindentation. High-carbon steel cantilevers were exposed to nonlinear harmonic oscillation. The indentation modulus on the beam surface and plastic work during indentation decreased as a function of cycles, which was attributed to grain fragmentation and reorientation as well as the continuous reduction in inherent energy dissipation capacity of the material. X-ray diffraction, electron backscatter diffraction, and atomic force microscopy were used to characterize this microstructural evolution during early stages of the beam fatigue life, which altered 1) the local mechanical properties and 2) the global structural dynamic response. The results provide insight into fatigue damage precursors and provides a framework for connecting materials evolution with nonlinear structural dynamics.

    Original languageEnglish
    Pages (from-to)1027-1035
    Number of pages9
    JournalExperimental mechanics
    Volume57
    Issue number7
    DOIs
    Publication statusPublished - 1 Sep 2017

    Keywords

    • Damage precursor
    • Fatigue
    • Nanoindentation
    • Nondestructive testing
    • Nonlinear dynamics
    • Micromechanics
    • Connecting nonlinearities

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