Influence of snap-back instabilities on Acoustic Emission damage monitoring

作者: Giuseppe Lacidogna , Federico Accornero , Alberto Carpinteri

DOI: 10.1016/J.ENGFRACMECH.2018.06.042

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摘要: Abstract Experimental tests are carried out to evidence the energy emitted during snap-back instabilities of rock specimens in compression. Several gypsum samples with different slenderness considered, and all monitored by means Acoustic Emission (AE) technique. In particular, cumulated number AE signals is used represent energy. The performed have been controlled compression two ways: through vertical or circumferential displacement, imposing both cases a constant displacement rate. For more brittle crack propagation suddenly occurs catastrophic drop load carrying capacity, resulting appears burst curve. When elongation, damage increment measured roller-link chain wrapped around cylindrical at mid-height order obtain complete vs. response. cases, decrease propagation: totally dissipated consequently no emissions due phenomena observed, proving that crushing fracture independent physical quantities, latter from local structural

参考文章(33)
K. J. Prasanna Lakshmi, M. V. M. S. Rao, Analysis of b-value and improved b-value of acoustic emissions accompanying rock fracture Current Science. ,vol. 89, pp. 1577- 1582 ,(2005)
Acoustic Emission Testing Springer Berlin Heidelberg. ,(2008) , 10.1007/978-3-540-69972-9
C. H. Scholz, The frequency-magnitude relation of microfracturing in rock and its relation to earthquakes Bulletin of the Seismological Society of America. ,vol. 58, pp. 399- 415 ,(1968)
Alberto Carpinteri, Giovanni Colombo, Numerical analysis of catastrophic softening behaviour (snap-back instability) Computers & Structures. ,vol. 31, pp. 607- 636 ,(1989) , 10.1016/0045-7949(89)90337-4
D. Lockner, The role of acoustic emission in the study of rock fracture International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. ,vol. 30, pp. 883- 899 ,(1993) , 10.1016/0148-9062(93)90041-B
L. R. Botvina, Damage evolution on different scale levels Izvestiya, Physics of the Solid Earth. ,vol. 47, pp. 859- 872 ,(2011) , 10.1134/S106935131110003X
Alberto Carpinteri, Notch sensitivity in fracture testing of aggregative materials Engineering Fracture Mechanics. ,vol. 16, pp. 467- 481 ,(1982) , 10.1016/0013-7944(82)90127-8
Dimitrios G. Aggelis, Classification of cracking mode in concrete by acoustic emission parameters Mechanics Research Communications. ,vol. 38, pp. 153- 157 ,(2011) , 10.1016/J.MECHRESCOM.2011.03.007