Abstract
When a material is subjected to alternating stresses, there are temperature fluctuations indicative of damping. Temperature effects give rise to entropy production. An analysis is made to obtain the entropy produced for a vibration cycle. This corresponds to the reciprocity of temperature rise and strain yielded that alter the material damping factor (MDF) as a function of shape and magnitude of material porosity or existing cracks. A homogeneous, isotropic, elastic bar is considered. It consists of uniformly distributed cavities or a single-edge crack subjected to alternating axial stresses. Dynamic characteristics of the porous or cracked medium are determined to evaluate the damping factor of the bar and/or of the material. The experimental data correlate well with the analytical results. The calculated damping factor in this work can be used as an indicator of structural integrity.
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