JIANG De-yi, YUE Hao-xue, ZHANG Xuan, et al. Acoustic emission of sandstone under uniaxial compression and simulation of fiber bundle model[J]. 2017, 38(S2): 1-8.
JIANG De-yi, YUE Hao-xue, ZHANG Xuan, et al. Acoustic emission of sandstone under uniaxial compression and simulation of fiber bundle model[J]. 2017, 38(S2): 1-8.DOI: 10.16285/j.rsm.2017.S2.001.
The fiber bundle model(FBM) and acoustic emission(AE) tests of sandstone under uniaxial force controlled compression are carried out to study the fracture characteristics of heterogeneous materials. The failure of fiber elements in fiber bundle model is analogous to the acoustic emission signal. The results show that: At low stress stage
FBM ignored the occasional avalanche processes
but FBM characterized acoustic emission characteristics well in high stress stage. The distribution of avalanche sizes and AE events both had double power-law behavior
and the probability distribution function(PDF) of simulations and tests share the similar power exponents and inflection points. Simulation and experimental results show a behavior analogous to the second-order phase transitions
and branching ratio ξ could be as a suitable order parameter to describe this transition. Moreover
near to the critical point
the evolution of branching ratio came from FBM and AE tests are consistent.