Some Pitfalls of Simplified Modeling for Viscoelastic Sandwich Beams

[+] Author and Article Information
Eric M. Austin, Daniel J. Inman

Center for Intelligent Material Systems and Structures, Mail Code 0261, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061

J. Vib. Acoust 122(4), 434-439 (Mar 01, 2000) (6 pages) doi:10.1115/1.1287030 History: Received May 01, 1999; Revised March 01, 2000
Copyright © 2000 by ASME
Topics: Damping , Modeling
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Predictions of modal loss by real and complex analyses for a typical (for this study) sandwich beam with 25 percent coverage
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Degrees of freedom for the Mead and Markus model
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Error in predictions of modal strain energy vs. percent coverage for the first three modes using the Mead-Markus approach
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First mode (symmetric boundary condition) for 25 percent coverage (50/125) with and without the assumption of equal transverse displacements
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Third mode (symmetric boundary condition) for 50 percent coverage (50/125) with and without the assumption of equal transverse displacements
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Third mode (symmetric boundary condition) for 75 percent coverage (50/125) with and without the assumption of equal transverse displacements
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Difference in mode 1 MSE predicted with C0-20 element assuming Poisson’s ratio ν=0.3 and ν=0.4999 vs. percent coverage
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MSE components in mode 1 vs. percent coverage 127-mm-long beam and ν=0.4999
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Second mode for 75 percent coverage (50/125) with and without the assumption of equal transverse displacements
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First mode (symmetric boundary condition) for 100 percent coverage (50/125) with and without the assumption of equal transverse displacements




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