FEASIBILITY ON GENERATION MECHANISM OF ULTRASONIC SHEAR WAVE FOR THE APPLICATION ON STACKING ORIENTATION DEFECT IN CFRP COMPOSITE LAMINATES

2009 ◽  
Author(s):  
Kwang-Hee Im ◽  
Hak-Joon Kim ◽  
Sung-Jin Song ◽  
David K. Hsu ◽  
Kil-Sung Lee ◽  
...  
Keyword(s):  
Shear Wave ◽  
Composite Laminates ◽  
Generation Mechanism ◽  
Cfrp Composite ◽  
Ultrasonic Shear ◽  
Orientation Defect

Influence of Ultrasonic Shear Wave on Defect Angles of Stacking Using CFRP Composite Laminates

2006 ◽  
pp. 787-792
Author(s):  
Je Woong Park ◽  
Sun Kyu Kim ◽  
Young Nam Kim ◽  
In Young Yang ◽  
David K. Hsu ◽  
...  
Keyword(s):  
Shear Wave ◽  
Composite Laminates ◽  
Cfrp Composite ◽  
Ultrasonic Shear

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.

Influence of Ultrasonic Shear Wave on Defect Angles of Stacking Using CFRP Composite Laminates

2006 ◽  
Vol 306-308 ◽  
pp. 787-792
Author(s):  
Je Woong Park ◽  
Sun Kyu Kim ◽  
Young Nam Kim ◽  
In Young Yang ◽  
David K. Hsu ◽  
...  
Keyword(s):  
Shear Wave ◽  
Composite Laminates ◽  
Azimuthal Angle ◽  
Normal Incidence ◽  
Cfrp Laminates ◽  
Fiber Placement ◽  
Decomposition Model ◽  
Vector Decomposition ◽  
Optical Test ◽  
Cfrp Composite

Because the layup of composite laminates influences there properties, the strength of composites depends on layup sequence of CFRP laminates. It is very important to detect ply error before the laminate is cured for both manual procedure and fiber placement procedure. An ultrasonic technique would be very beneficial, which could be used to test the part after and before curing laminates and requires less time than the optical test. Scanners were set out for different measurement modalities for acquiring ultrasonic signals as a function of in-plane azimuthal angle. The first motorized scanner was utilized for making transmission measurements using a pair of normal-incidence shear wave transducers. A scanner was built for the acousto-ultrasonic configuration using contact transducers. And a ply-by-ply vector decomposition model has been utilized for evaluating layup errors in composite laminates fabricated from unidirectional plies. We have compared the test results with model data. It is found that high probability shows between experimentations and the decomposition model in characterizing cured and uncured laminates with defect angles.

Analysis and modelling of cutting forces during the trimming of unidirectional CFRP composite laminates

2012 ◽  
Vol 12 (4) ◽  
pp. 337 ◽  
Author(s):  
Imed Zaghbani ◽  
Jean Francois Chatelain ◽  
Sébastien Berube ◽  
Victor Songmene ◽  
Justin Lance
Keyword(s):  
Cutting Forces ◽  
Composite Laminates ◽  
Cfrp Composite

Effective muscle elongation positions for the neck extensor muscles: An ultrasonic shear wave elastography study

2021 ◽  
pp. 102569
Author(s):  
Ko Yanase ◽  
Tome Ikezoe ◽  
Masatoshi Nakamura ◽  
Junya Saeki ◽  
Masahide Yagi ◽  
...  
Keyword(s):  
Shear Wave ◽  
Shear Wave Elastography ◽  
Extensor Muscles ◽  
Ultrasonic Shear
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