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A nondestructive method to determine material properties in orthotropic plates
Author(s) -
Fällström Ke,
Molin Ne
Publication year - 1987
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.750080206
Subject(s) - orthotropic material , materials science , vibration , finite element method , composite material , nondestructive testing , material properties , shear (geology) , structural engineering , acoustics , physics , quantum mechanics , engineering
An electronic speckle pattern interferometer (ESPI) is used to determine modes of vibration in rectangular, orthotropic, free‐free plates; that is using a noncontact, nondestructive, optical method. It is shown, using the finite element method (FEM), that each of the first three modes of vibration in rectangular orthotropic plates has a strong dependence upon only one of the main material parameters, namely the in‐plane shear modulus and the two Young's moduli, respectively. With this one‐variable dependence it is a simple task to determine the effective material parameters. This method has several obvious advantages compared to the use of test bars and it can be extended to give a measure of the damping parameters and probably also be used for production control. Preliminary results are presented and discussed.