Measurement and analysis of the nonlinear stiffness of cfrp components during vibration fatigue testing

Michele Peluzzo, Dario Di Maio*, Andrea Cammarano, Paolo Castellini

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

One of the typical fatigue failures of Carbon Fibre Reinforced Plastic (CFRP) components undergoing vibration loading is by delamination. Vibration fatigue tests are carried out at amplitude levels at which a sample undergoes to large deflections, and so high strains, to initiate the fatigue process. However, the higher the vibration amplitudes the higher the nonlinear vibration spectral contents will be. Furthermore, the occurrence of delamination generates additional nonlinear harmonics which are excitation cycles dependent, which means that the nonlinear stiffness changes with the component time to failure. This research work will attempt to create a multi-dimension stiffness map which is both function of the vibration amplitude and the number of cycles. The restoring surface map will be used to calculate the stiffness amplitude dependent as the fatigue process develops until the termination of the test. The ability to continuously monitor the nonlinear stiffness will allow to characterize the crack as it develops from a non-critical to a critical delamination size.

Original languageEnglish
Title of host publicationRotating Machinery, Optical Methods and Scanning LDV Methods, Volume 6 - Proceedings of the 38th IMAC, A Conference and Exposition on Structural Dynamics 2020
EditorsDario Di Maio, Javad Baqersad
PublisherSpringer
Pages61-71
Number of pages11
ISBN (Electronic)978-3-030-47721-9
ISBN (Print)978-3-030-47720-2
DOIs
Publication statusPublished - 2020
Event38th IMAC, A Conference and Exposition on Structural Dynamics, IMAC 2020 - Hyatt Regency, Houston, United States
Duration: 10 Feb 202013 Feb 2020
Conference number: 38

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

Conference38th IMAC, A Conference and Exposition on Structural Dynamics, IMAC 2020
Abbreviated titleIMAC 2020
CountryUnited States
CityHouston
Period10/02/2013/02/20

Keywords

  • CFRP
  • Nonlinear
  • SLDV
  • Vibration fatigue

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