dorsal/arxiv
View SchemaStrain-induced kinetics of intergrain defects as the mechanism of slow dynamics in the nonlinear resonant response of humid sandstone bars
| Authors | Oleksiy O. Vakhnenko, Vyacheslav O. Vakhnenko, Thomas J. Shankland, James A. Ten Cate |
|---|---|
| Categories | |
| ArXiv ID | physics/0403085 |
| URL | https://arxiv.org/abs/physics/0403085 |
| DOI | 10.1103/PhysRevE.70.015602 |
Abstract
A closed-form description is proposed to explain nonlinear and slow dynamics effects exhibited by sandstone bars in longitudinal resonance experiments. Along with the fast subsystem of longitudinal nonlinear displacements we examine the strain-dependent slow subsystem of broken intergrain and interlamina cohesive bonds. We show that even the simplest but phenomenologically correct modelling of their mutual feedback elucidates the main experimental findings typical for forced longitudinal oscillations of sandstone bars, namely, (i) hysteretic behavior of a resonance curve on both its up- and down-slopes, (ii) linear softening of resonant frequency with increase of driving level, and (iii) gradual recovery (increase) of resonant frequency at low dynamical strains after the sample was conditioned by high strains. In order to reproduce the highly nonlinear elastic features of sandstone grained structure a realistic non-perturbative form of strain potential energy was adopted. In our theory slow dynamics associated with the experimentally observed memory of peak strain history is attributed to strain-induced kinetic changes in concentration of ruptured inter-grain and inter-lamina cohesive bonds causing a net hysteretic effect on the elastic Young's modulus. Finally, we explain how enhancement of hysteretic phenomena originates from an increase in equilibrium concentration of ruptured cohesive bonds that are due to water saturation.
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"abstract": "A closed-form description is proposed to explain nonlinear and slow dynamics\neffects exhibited by sandstone bars in longitudinal resonance experiments.\nAlong with the fast subsystem of longitudinal nonlinear displacements we\nexamine the strain-dependent slow subsystem of broken intergrain and\ninterlamina cohesive bonds. We show that even the simplest but\nphenomenologically correct modelling of their mutual feedback elucidates the\nmain experimental findings typical for forced longitudinal oscillations of\nsandstone bars, namely, (i) hysteretic behavior of a resonance curve on both\nits up- and down-slopes, (ii) linear softening of resonant frequency with\nincrease of driving level, and (iii) gradual recovery (increase) of resonant\nfrequency at low dynamical strains after the sample was conditioned by high\nstrains. In order to reproduce the highly nonlinear elastic features of\nsandstone grained structure a realistic non-perturbative form of strain\npotential energy was adopted. In our theory slow dynamics associated with the\nexperimentally observed memory of peak strain history is attributed to\nstrain-induced kinetic changes in concentration of ruptured inter-grain and\ninter-lamina cohesive bonds causing a net hysteretic effect on the elastic\nYoung\u0027s modulus. Finally, we explain how enhancement of hysteretic phenomena\noriginates from an increase in equilibrium concentration of ruptured cohesive\nbonds that are due to water saturation.",
"arxiv_id": "physics/0403085",
"authors": [
"Oleksiy O. Vakhnenko",
"Vyacheslav O. Vakhnenko",
"Thomas J. Shankland",
"James A. Ten Cate"
],
"categories": [
"physics.geo-ph"
],
"doi": "10.1103/PhysRevE.70.015602",
"title": "Strain-induced kinetics of intergrain defects as the mechanism of slow dynamics in the nonlinear resonant response of humid sandstone bars",
"url": "https://arxiv.org/abs/physics/0403085"
},
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