声发射
蠕动
斑点图案
材料科学
断裂(地质)
度量(数据仓库)
航程(航空)
成像体模
断裂力学
声学
光学
物理
计算机科学
复合材料
数据库
作者
Leevi Viitanen,Markus Ovaska,Sumit Kumar Ram,Mikko J. Alava,Pasi Karppinen
标识
DOI:10.1103/physrevapplied.11.024014
摘要
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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