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Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy |
| KIM Chung-Seok1*, JHANG Kyung-Young2 |
1Metallurgy and Materials Engineering, Chosun University, Seosuk-dong, Gwangju, 501-759, South Korea
2Mechanical Engineering, Hanyang University, Hangdang-dong, Seongdong-gu, Seoul, 133-791, South Korea
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| Cite this article: |
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KIM Chung-Seok, JHANG Kyung-Young 2012 Chin. Phys. Lett. 29 120701 |
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Abstract The acoustic nonlinearity of surface waves is studied to evaluate plastic deformation in aluminum alloys. A narrow-band surface wave is successfully generated by a pulsed Nd-YAG laser system consisting of a beam expander and a slit mask. Various degrees of tensile deformation are induced by interrupting the tensile tests so as to obtain aluminum specimens with different degrees of plastic damage. The normalized acoustic nonlinearity increases as a function of tensile strain. The experimental results show that the acoustic nonlinearity of a laser-generated surface wave has a good correlation with the level of tensile deformation and has a potential to evaluate microdamage induced by dislocation microplasticity.
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Received: 10 July 2012
Published: 04 March 2013
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| PACS: |
07.64.+z
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(Acoustic instruments and equipment)
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81.70.Cv
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(Nondestructive testing: ultrasonic testing, photoacoustic testing)
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43.25.Dc
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(Nonlinear acoustics of solids)
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