Role of slow dynamics in fast dynamics ultrasonic measurements

Scalerandi, Marco; Mechri, Charfeddine; Bentahar, Mourad; Bella, Angelo Di; Gliozzi, Antonio; Tortello, Mauro

doi:10.1016/j.cnsns.2020.105452

Cited by 3 publications

(3 citation statements)

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“…This is due to the low loading rate of 0.5 MPa/min and the measured displacement magnitudes within the mm‐range. Studying rock samples with high‐frequency loading rates and observations on a smaller spatial scale (nm‐range) might require an adaption of the acquisition rate to properly determine all dynamic processes (Bella et al., 2021; Scalerandi et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

The Stress‐Memory Effect of Fracture Stiffness During Cyclic Loading in Low‐Permeability Sandstone

et al. 2021

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The performance of geothermal and petroleum reservoirs, as well as the safety of underground constructions such as nuclear waste repositories, depends on the ability of fractures to either promote or inhibit fluid flow. In addition, the stability of faults and fractures during hydraulic stimulation requires information on how to minimize and mitigate the risks of induced seismicity (Hofmann et al., 2018) or the loss of the hydraulic integrity of the subsurface (Pyrak-Nolte & Nolte, 2016). Coupled hydro-mechanical processes during stress-related deformation of fractures remain notoriously difficult to predict especially in complex fractured rock masses (Rutqvist, 2015). Besides, the evolution of stress over time changes either short-term or at geological time scales and strongly governs the exploration strategies in geothermal reservoirs. Laboratory experiments can be used to develop tools and knowledge about how to characterize fractured rock mass to better predict the hydraulic properties of rocks.

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Section: Discussionmentioning

confidence: 99%

The Stress‐Memory Effect of Fracture Stiffness During Cyclic Loading in Low‐Permeability Sandstone

et al. 2021

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“…within NMEM with the help of dynamic excitation. According to these studies, which are still relevant, hysteretic elastic nonlinearity is composed of two interlinked effects: the fast dynamics (FD) and the slow dynamics (SD) [4][5][6]. FD refers to instantaneous changes experimentally observed through harmonics generation, resonance frequency shift or dumping increase.…”

Section: Introductionmentioning

confidence: 99%

“…around one of their bending modes. The applied standing wave dynamic method is also denoted as 'Nonlinear Resonant Ultrasound Spectroscopy' in some references [1][2][3][4]. Figure 1 depicts the experimental setup for the nonlinear dynamic experiments.…”

Section: Introductionmentioning

confidence: 99%

Contribution of acoustic emission to the characterization of the nonlinear behavior of complex materials

Yu,

Bentahar,

Mechri

et al. 2022

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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The present work proposes an original experimental protocol to detect the nonlinear relaxation of concrete samples taken at intact and damaged states. This protocol is based on the passive monitoring of the nonlinear relaxation, which is usually performed using a low amplitude signal (probe) in slow dynamics experiments. Results show the relevance of the passive detection and reveal the existence of a 'silent period' during the first minutes of the nonlinear relaxation after which the AE hits start to be detected. The characteristics of the AE hits recorded during the passive relaxation showed a clear resemblance with those obtained during the damage of the different samples involving shear and compression mechanisms.

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