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Title
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Identification of Young's modulus from broadband modal analysis experiments
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Author
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Abstract
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| The stress-strain relationship of linear viscoelastic materials is characterised by a complex-valued, frequency-dependent elastic modulus E(jomega) (Young's modulus). Using system identification techniques it is shown in this paper how E(jomega) can be measured accurately in a broad frequency band from forced flexural (transverse) and longitudinal vibration experiments on a beam under free-free boundary conditions. The advantages of the proposed method are (i) it takes into account the disturbing noise and the non-linear distortions, (ii) E(jomega) is delivered with an uncertainty bound, (iii) the low sensitivity to non-idealities of the experimental set-up, and (iv) the ability to measure lowly damped materials. The approach is illustrated on brass, copper, plexiglass and PVC beams. (C) 2003 Elsevier Science Ltd. All rights reserved. |
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Language
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English
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Source (journal)
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Mechanical systems and signal processing. - London
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Publication
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London
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2004
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ISSN
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0888-3270
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DOI
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10.1016/S0888-3270(03)00045-1
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Volume/pages
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18
:4
(2004)
, p. 699-726
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ISI
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000221440200001
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Full text (Publisher's DOI)
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