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

Leevi Viitanen, Markus Ovaska, Sumit Kumar Ram, Mikko J. Alava, Pasi Karppinen

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
257 Downloads (Pure)

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.

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

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