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

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-02-06
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Mcode
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Language
en
Pages
1-9
Series
Physical Review Applied, Volume 11, issue 2
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.
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Viitanen , L , Ovaska , M , Ram , S K , Alava , M J & Karppinen , P 2019 , ' Predicting Creep Failure from Cracks in a Heterogeneous Material using Acoustic Emission and Speckle Imaging ' , Physical Review Applied , vol. 11 , no. 2 , 024014 , pp. 1-9 . https://doi.org/10.1103/PhysRevApplied.11.024014