Solution of Wave Propagation Problems by Boundary Elements

1982 ◽  
pp. 171-186 ◽  
Author(s):  
W. J. Mansur ◽  
C. A. Brebbia
Keyword(s):  
Wave Propagation ◽  
Boundary Elements

Comparison of Constant and Discontinuous Quadratic Boundary Elements for Exterior Axisymmetric Acoustic-Wave Propagation Problems

2015 ◽  
Vol 23 (04) ◽  
pp. 1540003 ◽  
Author(s):  
Sai Sudha Ramesh ◽  
Kian-Meng Lim ◽  
Boo Cheong Khoo
Keyword(s):  
Wave Propagation ◽  
Boundary Elements ◽  
Boundary Integral ◽  
Computational Time ◽  
Element Formulation ◽  
Acoustic Wave Propagation ◽  
Exterior Problems ◽  
Numerical Assessment ◽  
Wide Range ◽  
Constant Element

The present study involves numerical assessment of two types of boundary elements, namely constant and discontinuous quadratic elements based on a hypersingular Burton and Miller boundary integral formulation to tackle spurious frequencies manifesting in exterior problems. Convergence trends of the two types of boundary element with/without the inclusion of hypersingular formulation were studied for various combinations of boundary conditions and over a wide range of frequencies. The results indicate that discontinuous quadratic elements and constant elements give comparable results, with the quadratic elements being computationally more efficient as they take lesser computational time. Nevertheless, the constant element formulation is easier to implement, and it may be used for solving exterior wave propagation problems.

Seismic Wave Propagation in Non-Homogeneous Elastic Media by Boundary Elements

2017 ◽  
Author(s):  
George D. Manolis ◽  
Petia S. Dineva ◽  
Tsviatko V. Rangelov ◽  
Frank Wuttke
Keyword(s):  
Wave Propagation ◽  
Seismic Wave ◽  
Boundary Elements ◽  
Seismic Wave Propagation ◽  
Elastic Media

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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