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Poroelastodynamic responses and elastic moduli of a transversely isotropic porous cylinder under forced deformation test

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International Journal of Mining Science and Technology 2023年第7期33卷 793-800页

作者： Chao Liu Dung T.Phan Aramco Research Center-Houston Houston TX 77084USA

Existing transversely isotropic poroelastodynamics solutions are limited to infinite domains and without experimental validation. Furthermore, there is a lack of analytical simulations for the elastic moduli dispersion of fluid-saturated porous cylinders. To address these three limitations and investigate the mechanisms of moduli dispersion, we present the analytical solutions of the poromechanical responses and the elastic moduli dispersion of a transversely isotropic, fluid-saturated, finite porous cylinder subjected to a forced deformation test. Through an example, we demonstrate the effects of loading frequency, boundary conditions, and material's anisotropy, dimension, and permeability on the responses of pore pressure,force, displacement, and dynamic elastic moduli of the cylinder. The specimen's responses are significantly influenced by the frequency of the applied load, resulting in a drained state at low frequencies and an undrained state at high frequencies. At high frequencies, the sample behaves identically for an open or a closed lateral boundary, and permeability has insignificant effects. The dynamic elastic moduli are mainly controlled by the loading frequency and the ratio of the sample's radius to its height. Lastly,we show excellent matches between the newly derived analytical solution and laboratory measurements on one clay and two shale samples from Mont Terri.

关键词： Poroelastodynamics dynamic moduli Transversely isotropic Porous cylinder Forced deformation test

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Zener Relaxation Peak in an Fe—Cr—Al Alloy

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Chinese Physics Letters 2002年第11期19卷 1660-1662页

作者：周正存程和法等 LaboratoryofInternalFrictionandDefectsinSolids InstituteofSolidStatePhysicsChineseAcademyofSciencesHefei230031 LaboratoryofInternalFrictionandDefectsinSolids InstituteofSolidStatePhysicsChineseAcad

We have studied the temperature spectra of internal friction and relative dynamic modulus of the Fe-(25 wt%)Cr-(5 wt%)Al alloy with different grain sizes. It is found that a peak appears in the internal friction versus temperature plot at about 550°C. The peak is of a stable relaxation and is reversible, which occurs not only during heating but also during cooling. Its activation energy is 2.5 (± 0.15) eV in terms of the Arrhenius relation. In addition, the peak is not obvious in specimens with a smaller grain size. It is suggested that the peak originates from Zener relaxation.

关键词： dynamic moduli Specimens METAL ALLOY Zener relaxation Zener diodes Heating internal friction Cooling

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