scholarly journals Experimental study of the dynamic evolution of cumulative energy release during LiF fracture under uniaxial compression

2018 ◽  
Vol 132-133 ◽  
pp. 59-65 ◽  
Author(s):  
D. Mastrogiannis ◽  
S.M. Potirakis
Keyword(s):  
Experimental Study ◽  
Energy Release ◽  
Uniaxial Compression ◽  
Dynamic Evolution ◽  
Cumulative Energy

Experimental Study on Uniaxial Compression Behavior of Fissured Loess Before and After Vibration

2022 ◽  
Vol 22 (2) ◽  
Author(s):  
Jian Xu ◽  
Liyang Zhou ◽  
Yanfeng Li ◽  
Jiulong Ding ◽  
Songhe Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Uniaxial Compression ◽  
Compression Behavior ◽  
Before And After

scholarly journals MODELLING THE ENERGY RELEASE PROCESS OF AFTERSHOCKS

2017 ◽  
Vol 50 (3) ◽  
pp. 1341
Author(s):  
D. Gospodinov
Keyword(s):  
Stochastic Model ◽  
Energy Release ◽  
Aftershock Sequence ◽  
Suggested Model ◽  
Cumulative Energy ◽  
Release Process ◽  
Aftershock Sequences ◽  
Strain Release ◽  
Loma Prieta ◽  
Benioff Strain

A stochastic model for the study of Benioff strain release during aftershock sequences is suggested. The stochastic model is elaborated after a compound Poisson process and is applied on data of the M7.1 Ocober 18, 1989 Loma Prieta aftershock sequence in northern California, USA. The temporal evolution of the number of events is first modelled by the Restricted Epidemic Type Aftershock Sequence (RETAS) model and then the identified best fit model is incorporated in the energy release analysis. The suggested model is based on the assumptions that there is no relation between the magnitude and the occurrence time of an event first and second, that there is no relation between the magnitude of a certain event and magnitudes of previous events. The obtained results from the examination of the energy release reveal that the suggested model makes a good fit of the aftershock Benioff strain release and enables a more detailed study by identifying possible deviations between data and model. The real cumulative energy release values surpass the expected model ones, which proves that aftershocks, stronger than forecasted by the model, are clustered at the beginning of the Loma Prieta sequence.

Acoustic emission measurements and lattice simulations of microfracture events in spruce

Holzforschung ◽  
2010 ◽  
Vol 64 (4) ◽  
Author(s):  
Edwin Nagy ◽  
Eric N. Landis ◽  
William G. Davids
Keyword(s):  
Acoustic Emission ◽  
Fracture Energy ◽  
Energy Release ◽  
Lattice Model ◽  
Failure Modes ◽  
Mechanical Damage ◽  
Peak Strain ◽  
Cumulative Energy ◽  
Ae Energy ◽  
Total Fracture

Abstract A statistical lattice model was developed to investigate the energy associated with damage and failure of wood. The model incorporates several important morphological aspects of wood such as grain direction, early wood percentage and grain geometry. The model was developed to investigate progressive damage under enforced boundary displacements and has been adapted to predict fracture energy related phenomena. In this particular study, notched specimens were loaded in uniaxial tension while monitored by a passive acoustic emission (AE) measurement system. The energy associated with the mechanical damage was measured by the AE instruments and compared with the energy released by ruptured elements in the lattice model. Cumulative energy release was tracked as a function of specimen load and deformation in both model and experiment. A ratio was established between the cumulative AE energy released at the first drop in load and the cumulative fracture energy released when the model load-deformation relationship becomes significantly non-linear. An additional ratio was established between the total fracture energy measured prior to 50% of peak strain and the total fracture energy measured prior to peak strain. The magnitudes of these energy release ratios vary owing to a change in failure modes between the short model and the larger specimens; however, the shape of the AE energy release curve up to failure coincides well with that predicted by the model simulations.

Sign in / Sign up

Export Citation Format

Share Document