Investigation of solid/solid interface waves with laser ultrasonics

Han, Qing; Mei, Qian; Wang, H.

doi:10.1016/j.ultras.2006.07.010

Cited by 11 publications

(14 citation statements)

References 14 publications

(12 reference statements)

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“…The element sizes and the time step are 40 um and 3 ns, respectively. The physical and acoustic parameters of fused quartz and tungsten media used in the calculation are listed in Table 1 [12] . Then we simulate the model that the laser of 80um radius and other conditions unchanged.…”

Section: Numerical Simulation and Analysismentioning

confidence: 99%

Numerical simulation of laser induced interfacial wave on the transparent solid/solid interface

Xue¹,

Yan²

2014

SPIE Proceedings

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In this paper, the finite element method is used to simulate the laser generated interfacial wave on the transparent solid/solid interface in the thermoelastic region. Typical calculation is performed for the configuration of fused quartz bond to tungsten. Transient waveforms of laser-generated interfacial waves are presented. The results show that with the decrease of film thickness, the amplitude of interfacial waves becomes higher. And the surface waves all have appeared anomalous dispersion with films of different thickness. The simulations can provide theoretical guideline for the understanding of interfacial wave propagation.Keywords: finite element method,1aser ultrasonic, transparent solid/solid interface, interfacial wave.

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Section: Numerical Simulation and Analysismentioning

confidence: 99%

Numerical simulation of laser induced interfacial wave on the transparent solid/solid interface

Xue¹,

Yan²

2014

SPIE Proceedings

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“…Several authors have studied the dispersion curves of the welded interface, 18,35,61 the slip interface, 30,40 and the spring model 34 separately. Such analyses have led to a dispersion equation for each case.…”

Section: Dispersion Equations For Interface Waves Propagating Almentioning

confidence: 99%

“…(22), clearly shows that the interface waves are dispersive when taking the spring model into account. 19,31,34 Two types of interface waves corresponding to the two roots of the dispersion equations can exist between two isotropic solid half-spaces: the St wave and the LR wave. The phase velocity V LR of the LR wave is complex.…”

Section: Dispersion Equations For Interface Waves Propagating Almentioning

confidence: 99%

Scaled behavior of interface waves at an imperfect solid-solid interface

Valier‐Brasier

Dehoux

Audoin

2012

Journal of Applied Physics

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Laser ultrasonic techniques allow the remote analysis of adhesion mechanisms at imperfect interfaces up to GHz frequencies. However, the sensitivity of interface waves to the properties of the contact is not very well known. In the present work, the mechanical boundary conditions are described considering that the contacting solid half-spaces are connected by tangential and normal springs. Such a modeling implies a discontinuity of the displacement field across the interface. To identify the relative amplitudes of the different types of interface waves-skimming, leaky Rayleigh (LR) and Stoneley (St) waves-a semi-analytical time domain model describing the thermoelastic laser generation is derived. The results illustrate the influence of the boundary conditions on the attenuation of the LR wave and on the existence of the St wave. In addition, a single compact and elegant dispersion equation is presented to investigate the behaviour of the interface waves propagating along a generalized imperfect boundary. Such analysis reveals the existence of a cutoff frequency f c close to which the St wave behaves like a skimming transverse wave. A scaled analysis demonstrates that two master curves suffice to describe the dispersion of LR and St waves and that f c is inversely proportional to the tangential interfacial spring constant.

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“…Realistic simulations of ultrasonic waves interacting with weak bonds would provide an understanding of this complex behavior and could be used to develop and optimize nondestructive detection techniques. Previous work in the field of modeling weak bonds has involved approaches such as transitioning from welded to slip boundary conditions at the interface using spring boundaries [16][17][18]. Contact-friction interfaces and periodic air or water filled voids are also approaches that have been used to model weak bonds [11].…”

Section: Wave Interaction With Weak Bondsmentioning

confidence: 99%

3D modeling of ultrasonic wave interaction with disbonds and weak bonds

Leckey

Hinders

2012

AIP Conference Proceedings

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ABSTRACT. Ultrasonic techniques, such as the use of guided waves, can be ideal for finding damage in the plate and pipe-like structures used in aerospace applications. However, the interaction of waves with real flaw types and geometries can lead to experimental signals that are difficult to interpret. 3-dimensional (3D) elastic wave simulations can be a powerful tool in understanding the complicated wave scattering involved in flaw detection and for optimizing experimental techniques. We have developed and implemented parallel 3D elastodynamic finite integration technique (3D EFIT) code to investigate Lamb wave scattering from realistic flaws. This paper discusses simulation results for an aluminum-aluminum diffusion disbond and an aluminum-epoxy disbond and compares results from the disbond case to the common artificial flaw type of a flat-bottom hole. The paper also discusses the potential for extending the 3D EFIT equations to incorporate physics-based weak bond models for simulating wave scattering from weak adhesive bonds.

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Investigation of solid/solid interface waves with laser ultrasonics

Cited by 11 publications

References 14 publications

Numerical simulation of laser induced interfacial wave on the transparent solid/solid interface

Numerical simulation of laser induced interfacial wave on the transparent solid/solid interface

Scaled behavior of interface waves at an imperfect solid-solid interface

3D modeling of ultrasonic wave interaction with disbonds and weak bonds

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