Title
Identification of Young's modulus from broadband modal analysis experiments Identification of Young's modulus from broadband modal analysis experiments
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
article
Publication
London ,
Subject
Engineering sciences. Technology
Source (journal)
Mechanical systems and signal processing. - London
Volume/pages
18(2004) :4 , p. 699-726
ISSN
0888-3270
ISI
000221440200001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
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.
E-info
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