Dynamic Model for Fatigue Evolution in a Cracked Beam Subjected to Irregular Loading | Zendy

Son Hai Nguyen | Zendy; David Chelidze | Zendy

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Dynamic Model for Fatigue Evolution in a Cracked Beam Subjected to Irregular Loading

Author(s) -

Son Hai Nguyen,

David Chelidze

Publication year - 2016

Publication title -

journal of vibration and acoustics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 82

eISSN - 1528-8927

pISSN - 1048-9002

DOI - 10.1115/1.4035112

Subject(s) - structural engineering , vibration fatigue , beam (structure) , bernoulli's principle , vibration , nonlinear system , materials science , fracture mechanics , paris' law , coupling (piping) , crack closure , mechanics , fatigue testing , engineering , composite material , physics , acoustics , quantum mechanics , aerospace engineering

The coupling of vibration and fatigue crack growth for a simply supported uniform Euler-Bernoulli beam containing a single-edge crack is analyzed. In this model, the fatigue crack length is treated as a generalized coordinate of a mechanical system. The fatigue accumulation is a result of the interaction between the beam oscillations and the crack propagation dynamics. Nonlinear characteristics of the beam motion are introduced as loading parameters to the fatigue damage model to match experimentally observed dynamics. The method of averaging is utilized as an analytical and numerical tool to compare the accumulation of fatigue damage in the system predicted by our model with Paris’ law and the experimental data. A utility of the fatigue model is demonstrated in estimating fatigue life under irregular loadings.

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