BEM ANALYSIS OF LAMB WAVE SCATTERING BY LAYERED PLATE DEBONDING

Analysis of Rayleigh-Lamb wave scattering by a crack in an elastic plate

This paper considers the scattering of low-frequency elastic waves by a crack in a plate. A simple formula is derived for the re ̄ection coef®cient which serves as a lower bound to the re ̄ection coef®cient at higher frequencies. Notation a half crack length c speed of S-waves in plate cL speed of longitudinal waves in an in®nite medium cT speed of transverse waves in an in®nite medium d half thi...

Damping Factor of Composite Plate Using Lamb Wave Method

The article presents the methodology for finding material damping capacity at higher frequency and lower amplitudes. Lamb wave dispersion theory is used for finding the damping capacity of composite material which is used at extensively high frequency applications. The method has been implemented on carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) plates. The Lam...

Seismic Wave Scattering Through a Compressed Hybrid BEM/FEM Method

Approximate numerical techniques, for the solution of the elastic wave scattering problem over semi-infinite domains are reviewed. The approximations involve the representation of the half-space by a boundary condition described in terms of 2D boundary element discretizations. The classical BEM matrices are initially re-written into the form of a dense dynamic stiffness matrix and later approxi...

Electromagnetic Wave Scattering in Random Layered Structures

AE Source Orientation by Plate Wave Analysis

Lead breaks (Hsu-Neilsen source) were used to generate simulated acoustic emission signals in an aluminum plate at angles of 0, 30, 60, and 90 degrees with respect to the plane of the plate. This was accomplished by breaking the lead on slots cut into the plate at the respective angles. The out-of-plane and in-plane displacement components of the resulting signals were detected by broad band tr...