Finite Element Modeling of Laser Ultrasonics Process in Thermoelastic Regime

علوم کاربردی و محاسباتی در مکانیک

Article 8, Volume 32, Issue 1 - Serial Number 23, 2021, Pages 133-152   

Document Type: Original Article

DOI: 10.22067/jacsm.2021.56657.0

Authors

Salman Shamsaei; Farhang Honarvar^*

Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran.

Abstract

In this paper, the propagation of ultrasonic waves generated by a laser pulse in thermoelastic regime up to the evaporation threshold of the material is modeled in two-dimensions by using the Code-Aster finite element solver. While in previous studies, this problem is solved in one step, in the new approach, we use different meshes and different increment times for modeling each of the thermal and mechanical parts of the problem. This new approach results in significant reduction in computation time. The propagation of ultrasonic waves generated by laser powers of up to 10 mJ with 17 ns pulse duration are modeled as a function of time. Computation time for separate thermal and mechanical analyses on the computer used for this purpose was 1 hour and 55 minutes; while combined analysis of the problem on the same computer takes at least 11 hours and 29 minutes. The resulting longitudinal and transverse waves, as well as the thermal behaviour of the material are then analysed and the results are compared with experimental and numerical data available in the literature. Very good agreement is observed between our simulation results and experimental and numerical results available in the literature which indicates that the laser ultrasonics process is accurately modeled by using the new approach and new finite element solver.

Keywords

Laser; Ultrasound; Finite element; Code-Aster; Nondestructive evaluation

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