[논문]Initial Second Harmonic Generation in Narrowband Surface Waves by Multi-Line Laser Beams for Two Kinds of Spatial Energy Profile Models: Gaussian and Square-Like

Choi, Sungho; Jhang, Kyung-Young

doi:10.7779/jksnt.2013.33.3.257

Initial Second Harmonic Generation in Narrowband Surface Waves by Multi-Line Laser Beams for Two Kinds of Spatial Energy Profile Models: Gaussian and Square-Like 원문보기

비파괴검사학회지 = Journal of the Korean Society for Nondestructive Testing, v.33 no.3 = no.137, 2013년, pp.257 - 263

Choi, Sungho (Graduate School of Mechanical Engineering, Hanyang University) , Jhang, Kyung-Young (School of Mechanical Engineering, Hanyang University)

Abstract ▼ AI-Helper

Acoustic nonlinearity of surface waves is an effective method to evaluate the micro damage on the surface of materials. In this method, the $A_1$ (magnitude of the fundamental wave) and $A_2$ (magnitude of the second-order harmonic wave) are measured for evaluation of acoustic nonlinearity. However, if there is another source of second-order harmonic wave other than the material itself, the linear relationship between $A_1{^2}$ and $A_2$ will not be guaranteed. Therefore, the second-order harmonic generation by another source should be fully suppressed. In this paper, we investigated the initial second-order harmonic generation in narrowband surface waves by multi-line laser beams. The spatial profile of laser beam was considered in the cases of Gaussian and square-like. The temporal profile was assumed to be Gaussian. In case of Gaussian spatial profile, the generation of the initial second-order harmonic wave was inevitable. However, when the spatial profile was square-like, the generation of the initial second-order harmonic wave was able to be fully suppressed at specific duty ratio. These results mean that the multi-line laser beams of square-like profile with a proper duty ratio are useful to evaluate the acoustic nonlinearity of the generated surface waves.

주제어

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가설 설정

In practical situations, it is necessary to take into account the thermal expansions in three-dimension with the thermal conductions. Also the Gaussian temporal profile of the laser beam should be considered.
In this paper, we investigated the initial second harmonic generation in narrowband surface waves by multi-line laser beams. The spatial profile of laser beam was considered the cases of Gaussian and square-like.

제안 방법

The temporal profile was assumed to be Gaussian. The laser-generated surface waves were simulated using a two-dimensional numerical analysis based on the heat transfer and thermo-elastic model. In the numerical model, temperaturedependent properties, such as density, heat capacity, thermal conductivity, thermal expansion coefficient, Young’s modulus and Poisson’s ratio, were taken into account.

대상 데이터

2 shows the simulation model. The specimen material is aluminum 6061-T6. Boundary 1 is symmetric and the heat flux with a width of w/2 is given to the boundary 2.

데이터처리

In the numerical model, temperaturedependent properties, such as density, heat capacity, thermal conductivity, thermal expansion coefficient, Young’s modulus and Poisson’s ratio, were taken into account. Simulation results were obtained in terms of the normalized magnitude of initial second-order harmonic wave at each laser profile and duty ratio. Finally, the influences of laser profile and duty ratio on evaluation of acoustic nonlinearity were discussed.

이론/모형

The frequency response of the generated surface wave was simulated with a 2D symmetric model using COMSOL Multiphysics. Fig.

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