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Consequences of acoustic emission on crack speed and roughness exponent in brittle dynamic fracture

Parisi, Andrea and Ball, Robin C. (2005) Consequences of acoustic emission on crack speed and roughness exponent in brittle dynamic fracture. In: 11th International Conference on Fracture 2005, ICF11. , pp. 5345-5349. ISBN 9781617820632

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Abstract

We show by computer simulations that acoustic emission from the crack tip strongly reduces the delivery of fracture work, due to the coupling between the crack speed and the acoustic branches in dispersive media. The direct consequence is a selection criterion for the terminal crack speed which, for planar cracks, produces results corresponding to those found in experiments on highly anisotropic materials. In case of isotropic material with cracks of unrestricted geometry, the drop in the crack speed with respect to the planar case is connected to a mechanism of attempted branching, which is also responsible for the logarithmic roughness of the final fracture for marginal loadings. Higher loadings lead to a well defined roughness exponent of ζ ∼0.45 compatible with that measured experimentally at short length scales, and in our simulations clearly connected with the generation of macroscopic branches.

Item Type: Contribution in Book/Report/Proceedings
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1900/1909
Subjects: ?? GEOTECHNICAL ENGINEERING AND ENGINEERING GEOLOGY ??
Departments: Faculty of Health and Medicine > Medicine
ID Code: 125066
Deposited By: ep_importer_pure
Deposited On: 09 May 2018 16:42
Refereed?: Yes
Published?: Published
Last Modified: 03 Jan 2019 11:27
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/125066

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