Predicting Creep Failure from Cracks in a Heterogeneous Material using Acoustic Emission and Speckle Imaging

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  • ProtoRhino Ltd

Abstract

Finding out when cracks become unstable is at the heart of fracture mechanics. Cracks often grow by avalanches and when a sample fails depends on its past avalanche history. We study the prediction of sample failure in creep fracture under a constant applied stress and induced by initial flaws. Individual samples exhibit fluctuations around a typical rheological response or creep curve. Predictions using the acoustic emission from the intermittent crack growth are not feasible until well beyond the sample-dependent minimum strain rate. Using an optical speckle analysis technique, we show that predictability is possible later because of the growth of the fracture process zone.

Details

Original languageEnglish
Article number024014
Pages (from-to)1-9
JournalPhysical Review Applied
Volume11
Issue number2
Publication statusPublished - 6 Feb 2019
MoE publication typeA1 Journal article-refereed

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