Thermal-wave nondestructive evaluation of cylindrical composite structures using frequency-domain photothermal radiometry

2005 ◽  
Vol 97 (1) ◽  
pp. 014911 ◽  
Author(s):  
Chinhua Wang ◽  
Andreas Mandelis ◽  
Yue Liu
Keyword(s):  
Nondestructive Evaluation ◽  
Frequency Domain ◽  
Thermal Wave ◽  
Composite Structures ◽  
Photothermal Radiometry

Synchronous thermal wave IR video imaging for nondestructive evaluation

1989 ◽  
Vol 8 (2) ◽  
pp. 97-106 ◽  
Author(s):  
P. K. Kuo ◽  
T. Ahmed ◽  
L. D. Favro ◽  
H -J Jin ◽  
R. L. Thomas
Keyword(s):  
Nondestructive Evaluation ◽  
Thermal Wave ◽  
Video Imaging

Damage detection of unidirectional carbon fiber–reinforced laminates with embedded magnetostrictive particulates: A preliminary study

2012 ◽  
Vol 24 (8) ◽  
pp. 991-1006 ◽  
Author(s):  
Oliver J Myers ◽  
George Currie ◽  
Jonathan Rudd ◽  
Dustin Spayde ◽  
Nydeia Wright Bolden
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Nondestructive Evaluation ◽  
Composite Laminates ◽  
Composite Structures ◽  
Single Layer ◽  
Polymeric Composite ◽  
Analytical Models ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced

Defects in composite laminates are difficult to detect because of the conductive and paramagnetic properties of composite materials. Timely detection of defects in composite laminates can improve reliability. This research illustrates the preliminary analysis and detection of delaminations in carbon fiber laminate beams using a single layer of magnetostrictive particles and noncontacting concentric magnetic excitation and sensing coils. The baseline analytical models also begin to address the intrusive nature of the magnetostrictive particles as well as relate the applied excitation field with the stress and magnetic flux densities induced in the magnetostrictive layer. Numerical methods are used to begin to characterize the presence of magnetostrictive particles in the laminate and the behavior of the magnetostrictive particles in relationship to the magnetic field used during sensing. Unidirectional laminates with embedded delaminations are used for simulations and experimentations. A novel, yet simplified fabrication method is discussed to ensure consistent scanning and sensing capabilities. The nondestructive evaluation scanning experiments were conducted with various shapes and sizes of damages introduced into carbon fiber–reinforced polymeric composite structures. The results demonstrate high potential for magnetostrictive particles as a low-cost, noncontacting, and reliable sensor for nondestructive evaluation of composite materials.

Nondestructive Evaluation of Composite Structures Using System Identification Technique

1988 ◽  
Vol 110 (2) ◽  
pp. 134-139 ◽  
Author(s):  
W. H. Tsai ◽  
J. C. S. Yang
Keyword(s):  
System Identification ◽  
Nondestructive Test ◽  
Nondestructive Evaluation ◽  
Fatigue Damage ◽  
Composite Structures ◽  
Impact Damage ◽  
Epoxy Ring ◽  
System Parameters ◽  
Identification Technique

A system identification technique is presented for nondestructive test to detect and to characterize the existence and location of cracks and other damages in composite structures. Various composite structures, including Kevlar-epoxy plate, graphite epoxy ring, and graphite-epoxy coupon have been tested for different damages such as crack, delamination, impact damage, fatigue damage, etc. In addition, the correlation between severity of any type of the damages mentioned above and changes in identified system parameters has also been systematically studied.

Nondestructive Evaluation of In-Isolation Pile Shaft Integrity by Wigner-Ville Distribution

2007 ◽  
Vol 23 (1) ◽  
pp. 15-21 ◽  
Author(s):  
S.-H. Ni ◽  
J.-J. Charng ◽  
K.-F. Lo
Keyword(s):  
Nondestructive Evaluation ◽  
Frequency Domain ◽  
Frequency Domain Analysis ◽  
Analysis Tool ◽  
Signal Process ◽  
Time Frequency ◽  
Concrete Piles ◽  
Integrity Testing ◽  
Signal Characteristics ◽  
Cast Concrete

AbstractThe Wigner-Ville Distribution is a new numerical analysis tool for signal process technique in the time-frequency domain and it can offer assistance and enhance signal characteristics for better resolution both easily and quickly. Time-frequency transform can describe how a spectrum of signals changes with time owing to defects and boundary conditions. In this study, five single pre-cast concrete piles have been tested and evaluated by both sonic echo method and Wigner-Ville distribution (WVD). The appropriateness of time-frequency domain analysis is discussed. Furthermore, two difficult problems in nondestructive evaluation problems are discussed and solved: the first one is with a pile with slight defect, whose necking area percentage is less than 10%, and the other is a pile with multiple defects. The results show that WVD can not only recognize the characteristics easily, but also locate the defects more clearly than the traditional pile integrity testing method.

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