Convergent laser beam shapes: Unveiling the dynamics of Laser-induced elastic waves in composite materials

Zarei, Alireza; Li, Gang; Pourboghrat, Farhang; Pilla, Srikanth

doi:10.1016/j.rinp.2024.108061

Title: Convergent laser beam shapes: Unveiling the dynamics of Laser-induced elastic waves in composite materials

Journal Article · 25 November 2024 · Results in Physics

DOI: https://doi.org/10.1016/j.rinp.2024.108061 · OSTI ID:2479394

Zarei, Alireza ^[1]; Li, Gang ^[2]; Pourboghrat, Farhang ^[3]; Pilla, Srikanth ^[1]

Univ. of Delaware, Newark, DE (United States)
Clemson Univ., SC (United States)
The Ohio State Univ., Columbus, OH (United States)

Overcoming the low signal-to-noise ratio (SNR) in laser ultrasonic testing of composite materials remains a significant challenge. Current efforts focus on enhancing SNR by inserting more energy into the material through temporal and/or spatial modulation of the laser beam. However, potential SNR improvements through wave convergence and wave energy manipulation have been overlooked. This paper addresses this gap by demonstrating the convergence of different wave types to a designated point and by showing the feasibility of directing absorbed laser energy into a specific wave type through spatial modulation of the laser beam. To achieve this, mathematical expressions for the convergent laser beams are derived. Various laser beam profiles are then introduced to the thermoelastic equations and solved using the finite element method. The sample under investigation is a transversely isotropic unidirectional carbon fiber reinforced plastic, characterized by anisotropic thermal expansion coefficients and thermal conductivities. Results reveal pronounced convergence of the intended wave type at the center due to laser beam shaping. This study showcases the ability to direct absorbed laser energy toward a specific wave type through spatial modulation of the laser beam and highlights the role of material anisotropy in energy focusing.

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Research Organization:: Clemson Univ., SC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0023389

OSTI ID:: 2479394

Journal Information:: Results in Physics, Journal Name: Results in Physics Vol. 67; ISSN 2211-3797

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Convergent laser beam shapes: Unveiling the dynamics of Laser-induced elastic waves in composite materials

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