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Download fileTheory of dynamic mode-II delamination in end-loaded split tests
journal contribution
posted on 2020-11-09, 09:55 authored by Tianyu Chen, Christopher HarveyChristopher Harvey, Simon WangSimon Wang, Vadim SilberschmidtVadim SilberschmidtThe dynamic mode-II energy release rate (ERR) of the end-loaded split (ELS) test with
applied time-dependent displacement is derived for the first time with the effect of vibration
included. Dynamic Euler-Bernoulli beams are used together with a deflection condition to
simulate contact. To understand 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 ELS specimen. Certain vibration modes are
dominant dependent on the spatial factor. In addition, for a given spatial factor, there may be a
certain vibration mode, which makes approximately zero contribution to the ERR. The
developed theory is verified against results from finite-element method (FEM) simulations and
it is in excellent agreement. This work now allows the loading rate-dependent mode-II
delamination toughness of materials to be determined by using ELS 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 against vibration-driven
delamination.
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