EMAT-generated shear wave transmission for NDE of composite laminates

2000 ◽  
Author(s):  
Dong Fei
Keyword(s):  
Shear Wave ◽  
Composite Laminates ◽  
Wave Transmission

On the source-frequency dependence of fracture-orientation estimates from shear-wave transmission experiments

2015 ◽  
Vol 114 ◽  
pp. 81-100 ◽  
Author(s):  
Leo K. Santos ◽  
J.J.S. de Figueiredo ◽  
Bode Omoboya ◽  
Jörg Schleicher ◽  
Robert R. Stewart ◽  
...  
Keyword(s):  
Frequency Dependence ◽  
Shear Wave ◽  
Wave Transmission ◽  
Fracture Orientation

Ultrasonic Nondestructive Approach on Fiber Orientation Inspection in CFRP Composite Laminates

2007 ◽  
Vol 566 ◽  
pp. 261-266
Author(s):  
In Young Yang ◽  
Yong Jun Yang ◽  
Kil Sung Lee ◽  
David K. Hsu ◽  
Kwang Hee Im
Keyword(s):  
Composite Materials ◽  
Shear Wave ◽  
Fiber Orientation ◽  
Composite Laminates ◽  
Isosceles Triangle ◽  
Orientation Error ◽  
Engineering Structures ◽  
Orthotropic Composite ◽  
Wide Range ◽  
Cfrp Composite

Owing to the advantages associated with their very large strength-to-weight and stiffnessto- weight ratios, composite materials are attractive for a wide range of applications. Increasingly, high performance engineering structures are being built with critical structural components made from composite materials. In particular, the importance of carbon-fiber reinforced plastics (CFRP) has been generally recognized in both space and civil aircraft industries, and CFRP composite laminates are widely used. It is very important to detect fiber orientation error in orthotropic composite laminates because the layup of a CFRP composite laminates affects the properties of the laminate, including stiffness, strength and thermal behavior. In this study, a new approach was investigated on detection of fiber orientation with using two longitudinal and a shear wave ultrasonic transducers for the orthotropic composite laminates. During testing, the most significant problem is that the couplant conditions do not remain the same because of changing the viscosity of the couplant. Therefore, making a design for generating shear wave with longitudinal transducers would greatly aid in alleviating the couplant problem. A pyramid with an isosceles triangle was made of aluminum in order to generate shear waves using two longitudinal transducers based on ultrasonic-polarized mechanism. It is found that the shear wave was very sensitive to fiber of CFRP composite. Finally, a CFRP composite material was nondestructively characterized in order to measure fiber orientation error area using automated data acquisition C-scan system.

Shear wave speed imaging using unfocused plane wave transmission

2013 ◽  
Vol 3 (4) ◽  
pp. 242-249 ◽  
Author(s):  
Jeong Man Park ◽  
Sung Jae Kwon ◽  
Mok Kun Jeong
Keyword(s):  
Plane Wave ◽  
Shear Wave ◽  
Wave Speed ◽  
Wave Transmission ◽  
Shear Wave Speed

Development of Ultrasonic-Polarized Mechanism for Stacking Orientation of Quasi-Isotropy Composite Laminates

2007 ◽  
Vol 124-126 ◽  
pp. 1091-1094
Author(s):  
Choong Ho Lee ◽  
Young Tae Cho ◽  
Kwang Hee Im ◽  
David K. Hsu ◽  
Je Woong Park
Keyword(s):  
Shear Wave ◽  
Composite Laminates ◽  
Shear Waves ◽  
Weight Ratio ◽  
Isosceles Triangle ◽  
Mineral Oil ◽  
Significant Problem ◽  
Ultrasonic Technique ◽  
Orientation Error ◽  
Orientation Determination

Composite laminates help to lighten components because they have the advantage of higher strength-to-weight ratio. So, they have come to be utilized as parts of advanced areas. An NDE technique for stacking orientation determination would be very beneficial because of layup orientation influence to the laminate stiffness. In this study, an investigation of shear wave ultrasonic technique was carried out in order to detect stacking orientation error for quasi-isotropy composite laminates. During testing, the most significant problem is that the couplant conditions do not remain the same because of changing the viscosity of the couplant. Therefore, the design and use of a shear wave transducers would greatly aid in alleviating the couplant problem. 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. The longitudinal transducers were mounted with mineral oil and the shear transducer was mounted on the bottom as a receiver with burnt honey. It is found that the shear wave was generated at a maximum and a minimum based on the ultrasonic-polarized mechanism. To apply this method into a practical inspection tool, the quasi-isotropy composite laminates were nondestructively evaluated for detecting error of the laminates.

Feasibility and Application on Ultrasonic-Polarized Shear Wave of Fiber Orientation Detection in Orthotropic Composite Laminates

2006 ◽  
Vol 324-325 ◽  
pp. 911-914
Author(s):  
Je Woong Park ◽  
Kwang Hee Im ◽  
David K. Hsu ◽  
Sun Kyu Kim ◽  
In Young Yang
Keyword(s):  
Shear Wave ◽  
Fiber Orientation ◽  
Composite Laminates ◽  
Isosceles Triangle ◽  
Test Results ◽  
Model Data ◽  
Orientation Error ◽  
Orthotropic Composite ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics

It is very important to detect fiber orientation error in orthotropic composite laminates because the layup of a CFRP (carbon-fiber reinforced plastics) composite laminates affects the properties of the laminate, including stiffness, strength and thermal behavior. In this study, an investigation of shear wave ultrasonic technique was carried out in order to detect stacking orientation error for the orthotropic composite laminates. During testing, the most significant problem is that the couplant conditions do not remain the same because of changing the viscosity of the couplant. Therefore, the design and use of a shear wave transducers would greatly aid in alleviating the couplant problem. A pyramid with an isosceles triangle with two 45o was made of aluminum to generate shear waves using two longitudinal transducers based on ultrasonicpolarized mechanism. Also, the signal splitter was connected to the pulser jack on the pulser/receiver and to the longitudinal transducers which were mounted with mineral oil. The shear transducer was mounted on the bottom as a receiver with burnt honey. It is found that the shear wave was generated at a maximum and a minimum based on the ultrasonic-polarized mechanism. Finally, test results with model data were compared for a fiber orientation of the laminates.

Sign in / Sign up

Export Citation Format

Share Document