Detection of stacking orientation error of CFRP composite laminates using ultrasound waves
(1. Division of Mechanical System Engineering, Chonbuk National University, Jeonju 561-756, Korea;
2. Center for Nondestructive Evaluation, Iowa State University, Ames, Iowa 50011, USA;
3. Department of Physical Education, Chosun University, Kwangju 501-759, Korea;
4. Department of Automotive Engineering, Woosuk University,
490, Hujung-ri, Samrae-up, Wanju-kun, Chonbuk, 565-701, Korea)
2. Center for Nondestructive Evaluation, Iowa State University, Ames, Iowa 50011, USA;
3. Department of Physical Education, Chosun University, Kwangju 501-759, Korea;
4. Department of Automotive Engineering, Woosuk University,
490, Hujung-ri, Samrae-up, Wanju-kun, Chonbuk, 565-701, Korea)
Abstract: A jig was developed for generating a shear wave. A pyramid with an isosceles triangle with two 45o was made of aluminum to generate shear waves using two longitudinal transducers based on ultrasonic-polarized mechanism. Also, the signal splitter was connected to the pulser jack on the pulser/receiver and to the longitudinal transducers. Therefore, an experimental way was performed in order to make shear wave on the bottom of aluminum alloyed pyramid. Also, a jig was manufactured and developed for generating a shear wave based on the computer numerical simulation. It is found that the experimentally shear wave variation of newly-designed jig is consistent with computer numerical simulation results and shear wave ultrasonic application can be very useful to detect the defects in CFRP composites.
Key words: carbon-fiber reinforced plastics (CFRP); polarized mechanism; stacking orientation defect; composite laminates