Feasibility on fiber orientation detection on unidirectional CFRP composite laminates using nondestructive evaluation techniques

In-Young Yang; Ji-Hoon Kim; Cheon-Seok Cha; Kil-Sung Lee; David K. Hsu; Kwang-Hee Im

doi:10.1117/12.779352

1 November 2007 Feasibility on fiber orientation detection on unidirectional CFRP composite laminates using nondestructive evaluation techniques

In-Young Yang, Ji-Hoon Kim, Cheon-Seok Cha, Kil-Sung Lee, David K. Hsu, Kwang-Hee Im

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Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 642316 (2007) https://doi.org/10.1117/12.779352
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

Abstract

In particular, CFRP (carbon fiber reinforced plastics) composite materials have found wide applicability because of their inherent design flexibility and improved material properties. CFRP composites were manufactured from uni-direction prepreg sheet in this paper. It is important to assess fiber orientation, material properties and part defect in order to ensure product quality and structural integrity of CFRP because strength and stiffness of composites depend on fiber orientation. It is desirable to perform nondestructive evaluation which is very beneficial. An new method for nondestructively determining the fiber orientation in a composite laminate is presented. A one-sided pitch-catch setup was used in the detection and evaluation of flaws and material anomalies in the unidirectional CFRP composite laminates. Two Rayleigh wave transducers were joined head-to-head and used in the pitch-catch mode on the surface of the composites. The pitch-catch signal was found to be more sensitive than normal incidence backwall echo of longitudinal wave to subtle flaw conditions in the composite. Especially, ultrasonic waves were extensively characterized in the CFRP composite laminates both normal to fiber and along to fiber with using a one-sided direction of Rayleigh wave transducers. Also, one-sided ultrasonic measurement was made with using a Rayleigh wave transducers and a conventional scanner was used in an immersion tank for extracting fiber orientation information from the ultrasonic reflection in the unidirectional laminate. Therefore, it is thought that the proposed method is useful to evaluate integrity of CFRP laminates.

Citation Download Citation

In-Young Yang, Ji-Hoon Kim, Cheon-Seok Cha, Kil-Sung Lee, David K. Hsu, and Kwang-Hee Im "Feasibility on fiber orientation detection on unidirectional CFRP composite laminates using nondestructive evaluation techniques", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 642316 (1 November 2007); https://doi.org/10.1117/12.779352

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KEYWORDS

Composites

Transducers

Ultrasonics

Nondestructive evaluation

Signal attenuation

Wave propagation

Manufacturing

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