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International Journal of Thermophysics

, Volume 36, Issue 5–6, pp 1236–1243 | Cite as

Numerical Simulation Study of Defect Detections by Using Laser Array Generated Giant Acoustic Waves

  • C. Ni
  • L. Dong
  • Z. Shen
  • X. Ni
  • D. Shi
Article

Abstract

Based on the classical theory of laser ultrasound generation in a thermoelastic regime, the generation of ultrasound by laser array source irradiation is simulated by the finite element method. The propagation and interaction of the laser-generated ultrasound with a bulk defect are studied. By changing the trigger time delay of a spatially evenly distributed laser array source, giant bulk waves with specific wavefronts and amplitudes several times larger than those of waves generated by a single laser source can be obtained. The interaction between giant acoustic waves and a bulk defect is compared with that in the model without the defect obtained under the same conditions. Results show that compared with a single-pulse generated acoustic wave, the detectability of multiple-source generated giant acoustic waves to defects can be improved significantly.

Keywords

Finite element method Laser array source Laser ultrasonics Micro-crack 

Notes

Acknowledgments

This paper is supported by the National Natural Science Foundation of China under Grant No. 61405093, the Natural Science Foundation of Jiangsu Province under Grant No. BK20140771, and financial support for the start-up scientific research of Nanjing University of Science and Technology.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.School of Electronic Engineering and Optoelectronic TechniquesNanjing University of Science and TechnologyNanjingChina
  2. 2.Institute of Research of Iron and SteelSha-SteelZhangjiagangChina
  3. 3.Department of PhysicsNanjing University of Science and TechnologyNanjingChina
  4. 4.Department of PhysicsNanjing University of Aeronautics and AstronauticsNanjingChina

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