scholarly journals Lock-in thermography using miniature infra-red cameras and integrated actuators for defect identification in composite materials

2022 ◽  
Vol 147 ◽  
pp. 107629
Author(s):  
G. Ólafsson ◽  
R.C. Tighe ◽  
S.W. Boyd ◽  
J.M. Dulieu-Barton
Keyword(s):  
Composite Materials ◽  
Defect Identification ◽  
Infra Red ◽  
Lock In

scholarly journals On the Thickness Quantification of Composite Materials by Using Lock-In Thermography

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1185
Author(s):  
Davide Palumbo
Keyword(s):  
Composite Materials ◽  
Measurement Accuracy ◽  
Plastic Material ◽  
Thickness Measurement ◽  
Glass Fiber Reinforced Plastic ◽  
Glass Fiber Reinforced ◽  
Reinforced Plastic ◽  
Test Parameters ◽  
Lock In ◽  
Non Destructive

Many structural components made of composite materials need an accurate thickness control during fabrication and/or maintenance. In this regard, various non-destructive techniques can be used for the online measuring of thickness of large components such as wings and fuselage in the aerospace industry. In this work, the capabilities of lock-in thermography technique in thickness measurement of glass fiber reinforced plastic material were investigated and a correct procedure has been proposed to ensure the best measurement accuracy. An analytical approach and several tests were carried out on a sample specimen with the aim to study the main test parameters. Finally, the limits of technique have been discussed.

Characterizations of Newly Fabricated Composite Materials Based on Organoclay Incorporated Polymeric Matrix

2017 ◽  
Vol 902 ◽  
pp. 79-82
Author(s):  
Bhajan Lal ◽  
Attaullah ◽  
Shafique Ahmed Arain ◽  
Sajid Haleem ◽  
Sagar Kumar
Keyword(s):  
Composite Materials ◽  
Polyacrylic Acid ◽  
Characteristic Peak ◽  
Sem Images ◽  
Porosity Distribution ◽  
Infra Red ◽  
Ft Ir ◽  
Organic Clay ◽  
Ir Analysis ◽  
Scanning Electron

This article reports the synthesis of engineered materials i.e. composite materials based on matrix (polymeric polyacrylic acid) and reinforcement (organic clay) through 6-hour and 12-hour ultrasonication at different intervals. All the precursors and desired composite materials were characterized by Fourier transform infra-red (FT-IR) and scanning electron microscopy (SEM) techniques. The disappearance of Si-O characteristic peak after ultrasonication justifies the fabrication and incorporation of organoclay in the polymeric structure of polyacrylic acid as revealed by FT-IR analysis. The SEM images interpreted the surface morphology, porosity, distribution and compatibility of matrix and reinforcement in it, which has been achieved successfully in this study for exfoliation form.

Defect-identification in composite materials using pattern recognition techniques on ultrasonic data

1993 ◽  
Vol 3 (1) ◽  
pp. 57-71 ◽  
Author(s):  
L. Schillemans ◽  
D. Van Hemelrijck ◽  
F. De Roey ◽  
W.P. De Wilde ◽  
A.H. Cardon ◽  
...  
Keyword(s):  
Pattern Recognition ◽  
Composite Materials ◽  
Defect Identification ◽  
Pattern Recognition Techniques

Lock-in thermography method for the NDT of composite materials

2008 ◽  
Author(s):  
Yanguang Zhao ◽  
Xinglin Guo ◽  
Mingfa Ren ◽  
Xiaogang Wang ◽  
YuNan He
Keyword(s):  
Composite Materials ◽  
Lock In

Research on Structure Stress Analysis on Composite by Lock-In Thermography

2010 ◽  
Vol 150-151 ◽  
pp. 1649-1654
Author(s):  
Xun Liu ◽  
Jun Yan Liu ◽  
Jing Min Dai
Keyword(s):  
Composite Materials ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Stress Analysis ◽  
Principal Stress ◽  
Mechanical Performance ◽  
Material Structure ◽  
Thermoelastic Effect ◽  
Component Structure ◽  
Lock In

The application of thermoelastic stress analysis in composite materials is particularly complicated because of the anisotropy of the material, which determines the thermoelastic effect to be depended on the material property and mechanical performance. This paper describes a theoretical and experimental analysis on full-filed stress distribution from thermoelastic measurements and its application to determination of stress concentration. The sum of the principal stress can be measured by Thermal Stress Analysis (TSA). Lock-in Thermography has been applied to measure the sum of principal stress distribution of component structure by its high thermal resolving. In this study, Experiments were carried out with GFRP composite ply and foam materials under cyclic load. The thermoelastic constant is obtained for GFRP and foam composite materials. The stress concentration is analyzed for a specimen with a hole. The experimental results show the stress distribution can be measured and analyzed using Lock-in thermography. It is found that the composite material structure stress can be evaluated with good accuracies by lock in thermography.

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