On Wave Propagation in Linear Viscoelasticity.

1984 ◽  
Author(s):  
W. J. Hrusa ◽  
m. Renardy
Keyword(s):  
Wave Propagation ◽  
Linear Viscoelasticity

Approximate Laplace Transform Inversion in Dynamic Viscoelasticity

1980 ◽  
Vol 47 (4) ◽  
pp. 769-774 ◽  
Author(s):  
S. R. Swanson
Keyword(s):  
Wave Propagation ◽  
Laplace Transform ◽  
Material Property ◽  
Linear Viscoelasticity ◽  
Dynamic Viscoelasticity ◽  
Inversion Methods ◽  
Laplace Transform Inversion ◽  
Inversion Techniques ◽  
Numerical Laplace Transform

Laplace transform techniques greatly simplify many problems in linear viscoelasticity. However, if realistic material property representations are used, inversion of the resulting transforms can be difficult. Although approximate transform inversion methods have been widely used in quasi-static viscoelastic problems, the application of these techniques to wave propagation problems has been less successful. Inaccuracy of the transform inversion has been noted previously in the literature. The present work shows that one of the numerical Laplace transform inversion techniques of Bellman can successfully be applied to dynamic viscoelasticity. Comparisons with literature solutions and exact functions indicate accuracies to within ±1 percent can be obtained.

scholarly journals On wave propagation in linear viscoelasticity

1985 ◽  
Vol 43 (2) ◽  
pp. 237-254 ◽  
Author(s):  
W. J. Hrusa ◽  
M. Renardy
Keyword(s):  
Wave Propagation ◽  
Linear Viscoelasticity

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

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