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Characterization of Fatigue Dynamics Under Deterministic and Stochastic Excitation

[+] Author Affiliations
Son Hai Nguyen, Mike Falco, Ming Liu, David Chelidze

University of Rhode Island, Kingston, RI

Paper No. DETC2012-71228, pp. 265-270; 6 pages
doi:10.1115/DETC2012-71228
From:
  • ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 6: 1st Biennial International Conference on Dynamics for Design; 14th International Conference on Advanced Vehicle Technologies
  • Chicago, Illinois, USA, August 12–15, 2012
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-4505-9
  • Copyright © 2012 by ASME

abstract

Estimating and tracking dynamics of crack growth is essential for fatigue failure prediction. A new experimental system coupling structural and crack growth dynamics was used to show fatigue damage accumulation is different under chaotic and stochastic loading, even when both excitations have similar spectral and statistical signatures. Furthermore, conventional rain-flow counting method considerably overestimates damage in case of chaotic forcing. Important nonlinear loading characteristics are identified to guide the new fatigue model development.

Copyright © 2012 by ASME

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