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 language | English |
|---|---|
| Article number | 024014 |
| Pages (from-to) | 1-9 |
| Journal | Physical Review Applied |
| Volume | 11 |
| Issue number | 2 |
| Publication status | Published - 6 Feb 2019 |
| MoE publication type | A1 Journal article-refereed |
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