Towards a Quantitative Analysis of Crackling Noise by Strain Drop Measurements

摘要: The method of measuring strain drops with a Dynamic Mechanical Analyzer (DMA) at slowly varying stress has considerable potential to become an interesting complementary tool for the study mechanical failure and earthquake dynamics in micron-sized materials. Evidence this claim is provided by measurements \(\mathrm {SiO_2}\)-based porous materials Vycor Gelsil under slow uniaxial compression constant force rates \(10^{-4}{-}10^{-3}\,\mathrm{N s}^{-1}\) using Diamond DMA (Dynamical Analyzer, Perkin Elmer). jerky evolution sample’s height time analyzed order determine corresponding power-law exponents maximum velocity distribution, squared distribution as well aftershock activity region before macroscopic failure. A comparison recent results from acoustic emission (AE) data on same (J. Baro, A. Corral, X. Illa, Planes, E. K. H. Salje, W. Schranz, D. Soto-Parra, Vives, Phys. Rev. Lett. 110, 088702 (2013)) shows similitude statistics, although two methods operate different spatial temporal scales. Moreover, obtained are reasonable agreement theoretical mean-field values (M. LeBlanc, L. Angheluta, Dahmen, N. Goldenfeld, B 87, 022126 (2013)). indicate that can be studied compression, which opens possibility laboratory also non-ambient conditions, i.e. high temperatures or confining liquid pore pressure.