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

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

2 Sitaatiot (Scopus)
178 Lataukset (Pure)

Abstrakti

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.

AlkuperäiskieliEnglanti
Artikkeli024014
Sivut1-9
JulkaisuPhysical Review Applied
Vuosikerta11
Numero2
DOI - pysyväislinkit
TilaJulkaistu - 6 helmikuuta 2019
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

Sormenjälki Sukella tutkimusaiheisiin 'Predicting Creep Failure from Cracks in a Heterogeneous Material using Acoustic Emission and Speckle Imaging'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.

  • Siteeraa tätä