期刊
PHILOSOPHICAL MAGAZINE LETTERS
卷 91, 期 8, 页码 554-560出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500839.2011.596491
关键词
crackling noise; cracking; mechanical testing; porous media; silicates
类别
资金
- CICyT (Spain) [MAT2010-15114]
The failure mechanism of porous materials under uniaxial stress has been investigated experimentally. Microporous SiO2, Vycor, has been subjected to slowly increasing compressive uniaxial stress with stress rates between 0.2 and 12.2 kPa/s. With increasing stress the strain changes stepwise with acoustic emission correlated with each volume collapse. The acoustic emission followed the characteristics of 'crackling noise' with a power law distribution over an exceptionally large interval of 6 decades at the slowest stress rate. The power law exponent is -1.39. Possible applications in mining industry and others are discussed.
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