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

IF 4.4 2区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Alireza Zarei , Gang Li , Farhang Pourboghrat , Srikanth Pilla
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Abstract

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.
会聚激光束形状:揭示复合材料中激光诱导弹性波的动力学
克服复合材料激光超声检测中的低信噪比问题仍然是一个重大挑战。目前的研究重点是通过对激光束的时间和/或空间调制,向材料中注入更多的能量,从而提高信噪比。然而,通过波收敛和波能量操纵来提高信噪比的潜力被忽视了。本文通过展示不同波型收敛到指定点,并通过展示通过激光光束的空间调制将吸收的激光能量定向到特定波型的可行性,解决了这一差距。为此,导出了会聚激光束的数学表达式。然后将各种激光束轮廓引入热弹性方程,并用有限元法求解。研究样品为横向各向同性单向碳纤维增强塑料,其热膨胀系数和导热系数具有各向异性。结果表明,由于激光束整形,预期波型在中心有明显的收敛。本研究展示了通过激光光束的空间调制将吸收的激光能量导向特定波型的能力,并强调了材料各向异性在能量聚焦中的作用。
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来源期刊
Results in Physics
Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY
CiteScore
8.70
自引率
9.40%
发文量
754
审稿时长
50 days
期刊介绍: Results in Physics is an open access journal offering authors the opportunity to publish in all fundamental and interdisciplinary areas of physics, materials science, and applied physics. Papers of a theoretical, computational, and experimental nature are all welcome. Results in Physics accepts papers that are scientifically sound, technically correct and provide valuable new knowledge to the physics community. Topics such as three-dimensional flow and magnetohydrodynamics are not within the scope of Results in Physics. Results in Physics welcomes three types of papers: 1. Full research papers 2. Microarticles: very short papers, no longer than two pages. They may consist of a single, but well-described piece of information, such as: - Data and/or a plot plus a description - Description of a new method or instrumentation - Negative results - Concept or design study 3. Letters to the Editor: Letters discussing a recent article published in Results in Physics are welcome. These are objective, constructive, or educational critiques of papers published in Results in Physics. Accepted letters will be sent to the author of the original paper for a response. Each letter and response is published together. Letters should be received within 8 weeks of the article''s publication. They should not exceed 750 words of text and 10 references.
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