Abbreviations
- H :
-
Specimen height
- L :
-
Specimen length
- B :
-
Specimen thickness
- a :
-
Notch length
- ρ AE :
-
The AE energy density
- E :
-
The AE energy of an individual event
- n :
-
The total number of AE events
- D :
-
Representative area
- u :
-
Opening displacement
- g xx :
-
Opening displacement gradient
- ε xx :
-
Opening displacement strain
- d :
-
The spacing of subset centers
- x :
-
Horizontal coordinate
- y :
-
Vertical coordinate
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Acknowledgements
The authors sincerely thank the advice from Professor Joseph F. Labuz at University of Minnesota, Twin Cities, and indeed, the financial supports from the National Natural Science Foundation of China (Grant Nos. 51304225, 51774305), the Foundation of State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing (No. PRP/open-1402).
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Lin, Q., Wang, S., Wan, B. et al. Characterization of Fracture Process in Sandstone: A Linear Correspondence Between Acoustic Emission Energy Density and Opening Displacement Gradient. Rock Mech Rock Eng 53, 975–981 (2020). https://doi.org/10.1007/s00603-019-01949-8
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DOI: https://doi.org/10.1007/s00603-019-01949-8