Noncontact Evaluation of Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy

Title
Noncontact Evaluation of Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy
Authors
장경영
Keywords
laser-generated surface wave; laser; ultrasonic surface wave; acoustic nonlinearity; two-wave mixing
Issue Date
2015-02
Publisher
TAYLOR & FRANCIS INC
Citation
RESEARCH IN NONDESTRUCTIVE EVALUATION, v. 26, NO 1, Page. 13-22
Abstract
A noncontact method to evaluate the acoustic nonlinearity of surface waves in a plastically deformed aluminum alloy is proposed. Line-arrayed laser beams modulated with slit masks were used for the generation of narrowband surface waves. A laser-ultrasonic detector using a two-wave mixing (TWM) approach was also employed to detect the surface waves. The specimens were deformed by a stroke-controlled tensile tester so as to generate various degrees of tensile deformation. The experimental results showed that the acoustic nonlinearity of the laser-generated surface waves increased according to the level of tensile deformation. This tendency was in good agreement with our previous results obtained using a contact piezoelectric (PZT)-transducer as the receiver. These results imply that our noncontact technique is suitable for the evaluation of acoustic nonlinearity and can be applied to practical damage assessment.
URI
http://www.tandfonline.com/doi/abs/10.1080/09349847.2014.934496http://hdl.handle.net/20.500.11754/22403
ISSN
0934-9847; 1432-2110
DOI
http://dx.doi.org/10.1080/09349847.2014.934496
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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