http://www.tandfonline.com/doi/abs/10.1080/09349847.2014.934496
pages 13-22
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.
2014.03.05 11:35
2014.09.29 13:41
2012.06.21 16:06
2012.05.03 23:38
2021.08.25 14:13
2012.05.03 23:40
2017.01.16 10:59
2012.05.03 23:13
2021.08.25 13:23
2014.03.05 11:38
2014.03.05 11:34
2014.09.29 13:36
2014.09.29 13:48
2012.05.03 23:32
2012.05.03 23:40
2012.05.03 23:34
2012.05.03 23:38
2012.05.03 23:36
2012.05.03 23:34
2012.05.03 23:37