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Raghuram, V.
- Determination of Elastic Constants of Aluminium Using Laser Based Ultrasonics
Abstract Views :374 |
PDF Views:127
Authors
Affiliations
1 Dept. of Physics, Christ Church College, Kanpur, IN
2 Indian Institute of Technology Kanpur, Kanpur,, IN
3 Indian Institute of Technology Kanpur, Kanpur, IN
1 Dept. of Physics, Christ Church College, Kanpur, IN
2 Indian Institute of Technology Kanpur, Kanpur,, IN
3 Indian Institute of Technology Kanpur, Kanpur, IN
Source
Indian Journal of Science and Technology, Vol 2, No 12 (2009), Pagination: 25-28Abstract
This paper deals with the determination of the elastic constants of aluminium from the analysis of laser generated ultrasonic bulk waves. A pulsed Nd:YAG laser (1064 nm) is used for ultrasonic generation in a thick stepped Al sample and a He-Ne laser is used for heterodyne detection of the generated signals. Ultrasonic signals obtained at epicenter and at off-epicenter position of the detection points are analyzed using wavelet transforms. Here the identification and of pressure as well as shear waves and the estimation of their velocities are done successfully. From the estimated velocities the elastic constants (Young's modulus, shear modulus, bulk modulus, Lames constant and Poisson's ratio) are calculated. The agreement of these constants with the standard values confirms the identification of shear waves at off-epicenter position. The work presented in this paper brings out the applicability of the study of laser generated bulk waves for the determination of elastic constants of any bulk material.Keywords
Laser Based Ultrasonics, Wavelet Transforms, Pressure Waves, Shear Waves, Elastic Constants, AlFull Text
References
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- Pramila T, Rashmi Shukla, Kishore NN and Raghuram V (2007b) A study of the spectral behavior of laser generated lamb waves using wavelet transforms. HSNT Conf., Chania, Greece. (October)
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- Surface Integrity Determination of Aluminum Plates Using Laser-generated Lamb Waves
Abstract Views :352 |
PDF Views:103
Authors
Affiliations
1 Department of Physics, Christ Church College, Kanpur-208001, IN
2 Indian Institute of Technology Kanpur Kanpur-208016, IN
1 Department of Physics, Christ Church College, Kanpur-208001, IN
2 Indian Institute of Technology Kanpur Kanpur-208016, IN
Source
Indian Journal of Science and Technology, Vol 3, No 3 (2010), Pagination: 231-234Abstract
Laser based ultrasonics is an important method in non-destructive testing for material characterization and process control. This paper describes the generation and characterization of Lamb waves in a thin aluminum plate-using laser based ultrasonics. Nd: YAG laser is used for ultrasonic generation and He-Ne Laser Heterodyne Interferometer is used for detection. Laser generation of Lamb waves leads to simultaneous generation of various frequency component as well as multiple Lamb wave modes. The surface integrity of a thin aluminium plate is studied.Keywords
Lamb Waves, Laser Generation, Surface IntegrityFull Text
References
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