Influence of Ultrasonic Waves on the Stacking Orientation in Carbon Fiber/Epoxy Composite Laminates

J. Ocean Eng. Technol. 2008;22(4):8-13.

Park Je-Woong,Kim Do-Jung,Hsu David K.,Seo Young-Hwan,Im Kwang-Hee

Dept. of Naval Architecture and Ocean Eng. Chosun University,Dept. of Naval Architecture and Ocean Eng. Chosun University,Center for Nondestructive Evaluation Iowa State University,Dept. Of Physical Education Chosun University,Department of Automotive

Keywords: Composite laminates polarized mechanism, Stacking orientation evaluation, Ultrasonic wave

Abstract

In this study, an investigation of shear wave ultrasonic technique was carried out to detect stacking orientation error for CF/Epoxy quasi-isotropy composite laminates. The ultrasonic shear wave is particularly sensitive to ply orientation and layup sequence in tire CF/Epoxy composite laminates. In the manufacturing of composite laminates, it is important that layup errors be detected in samples. In this work, an effect was mack to develop shear wave techniques that can be applied to composite laminates. During testing, the mast significant problem is that the couplant conditions do not remain the same because of its changing viscosity. The design and use of a shear ware transducer would greatly alleviate the couplant problem. A pyramid of aluminum, with isosceles triangle (two 45o angles) sides, was made to generate shear waves, using two longitudinal transducers based on an ultrasonic-polarized mechanism. A signal splitter was connected to the pulser jack on a pulser/receiver and to the longitudinal transducers. The longitudinal transducers were mounted with mineral oil, and the shear transducer was mounted with burnt honey on the bottom as a receiver. The shear wave was generated at a maximum and a minimum based on the ultrasonic-polarized mechanism.
Results
show it is feasible to measure layup error using shear wave transducers on a stacking of prepregs in composites.