Wave Diffusion Sensitivity to Angular Positions of Defects in Pipes

2015 ◽  
Vol 23 (03) ◽  
pp. 1550013 ◽  
Author(s):  
M. Kharrat ◽  
M. N. Ichchou ◽  
O. Bareille ◽  
W. Zhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Investigation ◽  
Crucial Role ◽  
Angular Position ◽  
Reflection And Transmission Coefficients ◽  
Steel Pipe ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Wave Diffusion

This paper provides a numerical investigation onto the effect of the angular position of a defect on the wave diffusion in a steel pipe. The wave finite element method (WFEM) is used to calculate reflection and transmission coefficients from defects with different angular positions as a function of frequency. The modeled defects are impinged successively by torsional T(0, 1), longitudinal L(0, 2) and flexural F(1, 2) modes. The wave diffusion in each case is examined leading to several important remarks. Results show that the choice of the incident mode as well as the studied reflected and transmitted modes play a crucial role in the circumferential localization of defects in pipes.

scholarly journals Determination Reflection and Transmission Coefficients of Lanthanum Iron Garnet Filled PVDF-Polymer Nanocomposite Using Finite Element Method Modeling at Microwave Frequencies

2012 ◽  
Vol 21 ◽  
pp. 151-157 ◽  
Author(s):  
Hasan Soleimani ◽  
Noorhana Yahya ◽  
Zulkifly Abbas ◽  
Hojjatollah Soleimani ◽  
Hasnah Mohd Zaid
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rectangular Waveguide ◽  
Polymer Nanocomposite ◽  
Reflection And Transmission Coefficients ◽  
Fem Modeling ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Iron Garnet ◽  
Element Method

In our previous work, the lanthanum iron garnet-filled PVDF-polymer nanocomposite has been prepared. The reflection and transmission coefficients of PVDF/LIG were measured using rectangular waveguide in conjunction with a microwave vector network analyzer (VNA) at X-band frequencies (8 GHz - 12 GHz). In this study, the distribution of electric field intensity of PVDF/ LIG which was loaded in rectangular waveguide was simulated based on Finite Element Method (FEM) formulation to show the essential differences of intensity of emitted electrical field. The computations of reflection and transmission coefficients of PVDF/ LIG were determined by using implementation FEM modeling rectangular waveguide. The FEM results were compared with the experimental achievement results using the rectangular waveguide. An excellent agreement between measured and simulated results was obtained based on the values of mean relative errors.

Numerical investigation of molten glass in a square cavity using finite element method

2015 ◽  
Author(s):  
Thanh Tung Duong ◽  
Nobuyoshi Tsuzuki ◽  
Gaku Hashimoto ◽  
Hideki Kawai ◽  
Hiroshige Kikura
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Investigation ◽  
Molten Glass ◽  
Square Cavity ◽  
Element Method

Reflection and Transmission Coefficients of Plane Waves in Magnetoelectroelastic Layered Structures

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
J. Y. Chen ◽  
H. L. Chen ◽  
E. Pan
Keyword(s):  
Piezoelectric Materials ◽  
Plane Waves ◽  
Layered Structures ◽  
Organic Glass ◽  
Reflection And Transmission Coefficients ◽  
Material Structure ◽  
Layered System ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Novel Material

Reflection and transmission coefficients of plane waves with oblique incidence to a multilayered system of piezomagnetic and/or piezoelectric materials are investigated in this paper. The general Christoffel equation is derived from the coupled constitutive and balance equations, which is further employed to solve the elastic displacements and electric and magnetic potentials. Based on these solutions, the reflection and transmission coefficients in the corresponding layered structures are subsequently obtained by virtue of the propagator matrix method. Two layered examples are selected to verify and illustrate our solutions. One is the purely elastic layered system composed of aluminum and organic glass materials. The other layered system is composed of the novel magnetoelectroelastic material and the organic glass. Numerical results are presented to demonstrate the variation of the reflection and transmission coefficients with different incident angles, frequencies, and boundary conditions, which could be useful to nondestructive evaluation of this novel material structure based on wave propagations.

Sign in / Sign up

Export Citation Format

Share Document