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Torsion modulus using the technique of mechanical spectroscopy in biomaterials
Carlos Alberto Fonzar Pintão,Diego R. N. Correa,Carlos R. Grandini 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.5
This work presents a new alternative to studying and determining the shear or torsion modulus, G. For this purpose, a measuring system was constructed with a rotational motion sensor coupled to a torsion pendulum that allowed the determination of the angular position as a function of time. Through an equation derived from studies of mechanical spectroscopy and the theory of relaxation of materials, G was calculated, and experiments were focused on validating it. The advantage of this technique, compared to other dynamical methods, is that it is not necessary to know the Poisson's ratio of the sample.
Measurement of the rotational inertia of bodies by using mechanical spectroscopy
Carlos Alberto Fonzar Pintão 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
In this paper, mechanical spectroscopy was used to study the rotational inertia of bodies. In order to verify and show its importance inrelation to other techniques, measurements of the internal friction and rotational inertia of a body with liquid or sand inside were carriedout. For a solid without axes and planes of symmetry, properties such as the matrix, directions and principal moments of inertia, variationof the rotational inertia for each of the coordinate planes, and the ellipsoid of inertia were determined. Force sensors and rotational motionwere used in the measurements taken in an arrangement that was specifically designed for this type of measure.