Journal ArticleDOI
A model of ultrasonic nondestructive testing for internal and subsurface cracks
Peter Bövik,Anders E Boström +1 more
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TLDR
In this article, a surface integral equation with the half-space Green tensor is employed to discretize the crack opening displacement in terms of Chebyshew functions having the correct square root behavior along the crack edges.Abstract:
The scattering of elastic waves in a half-space containing a striplike crack is investigated. As a special case it seems that the crack may be surface breaking. A surface integral equation with the half-space Green tensor is employed. The key point of the method is the expansion of the Green tensor in Fourier representations with the free part of the Green tensor expanded in the crack coordinate system and the half-space part in the half-space coordinate system. The integral equation is discretized by expanding the crack opening displacement in terms of Chebyshew functions having the correct square root behavior along the crack edges. The incident field is emitted from an ultrasonic probe and a recent model for this is employed. The signal response in another (or the same) probe is modeled by a reciprocity argument and the stationary phase approximation is employed to simplify the final answer, which is thus only valid in the far field of the probes (yielding essentially a spherical wave). Numerical results are given and are compared with both other methods and with available experiments.read more
Citations
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Journal ArticleDOI
Defect characterization using an ultrasonic array to measure the scattering coefficient matrix
TL;DR: It is demonstrated how measurement of the scattering coefficient matrix of a cracklike defect can be used to obtain its size, shape, and orientation.
Journal ArticleDOI
An ultrasonic method for dynamic monitoring of fatigue crack initiation and growth.
TL;DR: A methodology is presented based upon the behavior of ultrasonic signals versus applied load to detect and monitor formation and growth of cracks originating from fastener holes to determine the applied load and monitor crack initiation and growth.
Journal ArticleDOI
The Use of Ultrasonic Arrays to Characterize Crack-Like Defects
TL;DR: In this article, two approaches are considered for extracting the key parameters of crack length and orientation angle from a high-resolution image using a hybrid model combining a ray-based propagation model with scattering matrices to describe wave interaction with a defect.
Journal ArticleDOI
Fatigue crack growth monitoring using high-frequency guided waves
Bernard Masserey,Paul Fromme +1 more
TL;DR: In this paper, the use of a specific type of high-frequency guided ultrasonic wave that has good sensitivity for the detection of small defects, excited using a standard Rayleigh wedge transducer and propagating along the structure, has been investigated.
Journal ArticleDOI
Review of hypersingular integral equation method for crack scattering and application to modeling of ultrasonic nondestructive evaluation
TL;DR: In this paper, the authors present an analytically oriented hypersingular integral equation method for cracks in isotropic and anisotropic solids, where the unknown crack opening displacement in the integral equation is expanded in a set of Chebyshev functions, or the like, and projected onto the same set of functions.
References
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Journal ArticleDOI
General electromechanical reciprocity relations applied to the calculation of elastic wave scattering coefficients
TL;DR: In this article, general electromechanical reciprocity relations are applied to the calculation of elastic wave scattering coefficients observed at the electrical terminals of the transducer used in performing an experiment.
Journal ArticleDOI
Numerical modeling of elastic wave propagation and scattering with EFIT — elastodynamic finite integration technique
TL;DR: In this paper, the basic equations of EFIT, the Elastodynamic Finite Integration Technique, are formulated for anisotropic inhomogeneous media in 3D, and the discrete equations on a staggered grid resulting in a unique way to discretize material parameters, and evaluate stability conditions and consistency for isotropic homogeneous unbounded media.
Journal ArticleDOI
On Boundary Integral Equations for Crack Problems
Paul A. Martin,Frank J. Rizzo +1 more
TL;DR: In this paper, it was shown that the problem can be reduced to a hypersingular boundary integral equation, which is a regularized version of the integral equation of the classical linear boundary value problem.
Journal ArticleDOI
Reflection and transmission of obliquely incident Rayleigh waves by a surface‐breaking crack
Y. C. Angel,Jan Drewes Achenbach +1 more
TL;DR: Reflection, transmission, and scattering of Rayleigh waves that are obliquely incident on a surface-breaking crack are investigated in this paper, where the formulation of the problem has been reduced to two systems of singular integral equations of the first kind for the dislocation densities across the crack faces.
Journal ArticleDOI
Elastic wave scattering by a circular crack
Steen Krenk,Henrik Schmidt +1 more
TL;DR: In this article, the scattering of waves by a circular crack in an elastic medium is solved by a direct integral equation method based on expansion of stresses and displacements on the crack surface in terms of trigonometric functions and orthogonal polynomials.
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