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Theory of dynamic mode-II delamination in end-notched flexure tests

journal contribution
posted on 30.06.2021, 09:11 by Tianyu Chen, Christopher Harvey, Simon Wang, Vadim Silberschmidt
The dynamic mode-II energy release rate of the end-notched flexure (ENF) test with applied time-dependent displacement is derived for the first time with the effect of vibration included. A dynamic Euler-Bernoulli beam theory is employed together with a deflection condition to simulate contact. To investigate the dynamic effect and the relative dynamic contribution from each vibration mode, a dynamic factor and a spatial factor are defined. It is found that the contribution of the ith vibration mode is dependent on the spatial factor (which is a function of the delamination length and the total length of the ENF specimen) and that certain vibration modes are dominant (depending on the delamination-length ratio). In addition, for a given spatial factor, there may be a certain vibration mode with a zero contribution to the ERR. The developed theory is verified against results from finite-element-method simulation for two cases of ENF tests and they are in excellent agreement. This work now allows the loading ratedependent mode-II delamination toughness of layered materials to be determined using ENF tests. In addition, it provides understanding of the structural dynamic response in the presence of mode-II delamination and can guide the design of structures to mitigate the vibration-driven delamination.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Composite Structures

Volume

274

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Composite Structures and the definitive published version is available at https://doi.org/10.1016/j.compstruct.2021.114332

Acceptance date

29/06/2021

Publication date

2021-07-03

Copyright date

2021

ISSN

0263-8223

Language

en

Depositor

Dr Christopher Harvey. Deposit date: 30 June 2021

Article number

114332