A nondestructive study on porosity content and fiber orientation in CFRP composite laminates using ultrasonic technique method

2009 ◽  
Author(s):  
Je-Woong Park ◽  
Kwang-Hee Im ◽  
David K. Hsu ◽  
Vinay Dayal ◽  
Dan Barnard ◽  
...  
Keyword(s):  
Fiber Orientation ◽  
Composite Laminates ◽  
Ultrasonic Technique ◽  
Cfrp Composite

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.

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

THE EFFECT OF LAMINATION SCHEME AND ANGLE VARIATIONS TO THE DISPLACEMENTS AND FAILURE BEHAVIOUR OF COMPOSITE LAMINATE

2015 ◽  
Vol 76 (11) ◽  
Author(s):  
Azizul Hakim Samsudin ◽  
Jamaluddin Mahmud
Keyword(s):  
Fiber Orientation ◽  
Composite Laminates ◽  
Finite Element Modelling ◽  
Composite Laminate ◽  
Maximum Stress ◽  
Failure Load ◽  
Failure Criteria ◽  
Stress Theory ◽  
Failure Behaviour ◽  
Failure Index

This paper aims to investigate the effect of lamination scheme and angle variations to the displacements and failure behaviour of composite laminate. Finite element modelling and analysis of symmetric, anti-symmetric and angle-ply Graphite/ Epoxy laminate with various angles of fiber orientation subjected to uniaxial tension are performed. Maximum Stress Theory and Tsai-Wu Failure Criteria are employed to determine the failure load (failure index = 1). Prior to that, convergence analysis and numerical validation are carried out. Displacements and failure behaviour of the composite laminates (symmetric, anti-symmetric and angle ply) are analysed. The failure curves (FPF and LPF) for both theories (Maximum Stress Theory and Tsai-Wu) are plotted and found to be very close to each other. Therefore, it can be concluded that the current study is useful and significant to the displacements and failure behaviour of composite laminate.

Ultrasonic Detection of Fiber Orientation in Composite Laminates for Use of Vehicular Structures

2005 ◽  
pp. 2109-2114
Author(s):  
Je Woong Park ◽  
Kwang Hee Im ◽  
David K. Hsu ◽  
Seung Woo Na ◽  
Young Nam Kim ◽  
...  
Keyword(s):  
Fiber Orientation ◽  
Composite Laminates ◽  
Ultrasonic Detection
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