Noncontact Evaluation of Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy
Publication: Publication Date: 31 January 2015Testing Method: ,
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.
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