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LASER GENERATED THERMOELASTIC WAVES IN AN ANISOTROPIC INFINITE PLATE
 

Summary: LASER GENERATED THERMOELASTIC WAVES
IN AN ANISOTROPIC INFINITE PLATE
H. M. Al-Qahtani, and S. K. Datta
University of Colorado, Boulder, CO 80309-0427
ABSTRACT. An analysis of the propagation of thermoelastic waves in a homogenous,
anisotropic, thermally conducting plate has been presented in the context of the general-
ized (L-S) theory of thermoelasticity. Three different methods are used in this analysis:
two of them are exact and the third is a semi-analytic finite element method (SAFE). In
our exact analysis, two different approaches are used. The first one, which is applicable
to transversely isotropic plate, is based on introducing displacement potential functions,
whereas in the second approach, which is applicable to any triclinic material, we rewrite
the governing equations and boundary conditions in a matrix form. Finally, in the SAFE
method, the plate is discretized along its thickness using N parallel, homogeneous layers,
which are perfectly bonded together. Frequency spectrums are obtained using the three
methods and are shown to agree well with each other. Numerical calculations have been
presented for a silicon nitride (Si3N4) plate. However, the methods can be used for other
materials as well.
INTRODUCTION
Most materials undergo appreciable changes of volume when subjected to variations
of the temperature. If thermal expansions or contractions are not freely admitted,

  

Source: Al-Qahtani, Hussain M. - Mechanical Engineering Department, King Fahd University of Petroleum and Minerals

 

Collections: Engineering