Loss Factors of Viscoelastic Systems in Terms of Energy Concepts
Eric E. Ungar,Edward M. Kerwin +1 more
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TLDR
In this article, the authors re-examined the definition of loss factor in terms of energy quantities, particularly as it applies to composite viscoelastic systems, and proposed simple relations which express the loss factors of series-parallel arrays of massless VRSs.Abstract:
The definition of loss factor in terms of energy quantities is re‐examined, particularly as it applies to composite viscoelastic systems. A restatement of this definition in terms of a corresponding viscoelastic spring is used to show that this definition is extremely useful for massless (ideal viscoelastic spring) systems, but may be applied unambiguously to spring systems with a single attached mass only at resonance. Simple relations are presented which express the loss factors of series‐parallel arrays of massless viscoelastic springs in terms of properties of the individual components. Implications of these relations in damping of composite structures are discussed. (This work was supported in part by the Aeronautical Systems Division, U. S. Air Force.)read more
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Nonlinear Elastic Wave Spectroscopy (NEWS) Techniques to Discern Material Damage, Part II: Single-Mode Nonlinear Resonance Acoustic Spectroscopy
TL;DR: In this article, a single-mode nonlinear resonance acoustic spectroscopy (SIMONRAS) method was proposed to quantify the influence of mesoscopic features and damage in quasi-brittle materials.
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Micro-damage diagnostics using Nonlinear Elastic Wave Spectroscopy (NEWS)
TL;DR: The sensitivity of nonlinear elastic wave spectroscopy (NEWS) methods to the detection of damage features (cracks, flaws, etc.) is far greater than can be obtained with linear acoustical methods as mentioned in this paper.
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Damping in composite materials: Properties and models
TL;DR: In this article, a review of the available literature on damping in composite materials is presented, where a chronological review of test methods for damping estimation is presented in order to describe the time-line of theoretical knowledge development in this field.
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Research and applications of viscoelastic vibration damping materials: A review
TL;DR: A comprehensive review of the various research methods and theory calculation models that are employed in engineering to study the static and dynamic vibration characteristics of viscoelastic damping material (VDM) formed structures is presented in this article.
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Damage assessment in reinforced concrete using spectral and temporal nonlinear vibration techniques
TL;DR: In this article, both linear and nonlinear (amplitude-dependent) acoustical experiments are performed on a reinforced concrete (RC) beam in which damage is gradually induced by means of static loading tests.
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