scholarly journals Repeatability Study of Flash-Pulse Thermographic Inspection of CFRP Samples

2021 ◽  
Vol 8 (1) ◽  
pp. 1
Author(s):  
Michal Švantner ◽  
Lukáš Muzika ◽  
Alexey Moskovchenko ◽  
Celeste M. C. Pereira ◽  
Shumit Das
Keyword(s):  
Statistical Evaluation ◽  
Fiber Composite ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Carbon Fiber Composite ◽  
Repeatability And Reproducibility ◽  
Defects Identification ◽  
Non Destructive ◽  
Reference Samples ◽  
Composite Samples

Thermographic flash-pulse inspection is one of popular methods of non-destructive testing (NDT) of materials. Despite the automation of the NDT methods, most of them are based on visual inspections and results of these inspections are influenced by the skills of operators. The repeatability and reproducibility (R&R) of these inspections are therefore more important compared to exact gauge-type methods. This study was focused on the statistical evaluation of flash pulse inspection. Space hardware representative carbon-fiber composite samples with 50 artificial defects were used as reference samples, which were independently inspected by three operators in two independent runs. A Gage R&R study was performed based on contrast to noise ratio defects identification. It was determined that at certain conditions, a total R&R variability 29% can be achieved, which can be assumed as acceptable for this application.

FIRE DAMAGE ON CARBON FIBER MATERIALS CHARACTERIZED BY THZ WAVES

2007 ◽  
Vol 17 (02) ◽  
pp. 213-224 ◽  
Author(s):  
NICHOLAS KARPOWICZ ◽  
DAVID DAWES ◽  
MARK J. PERRY ◽  
X. -C. ZHANG
Keyword(s):  
Carbon Fiber ◽  
Time Domain ◽  
Fiber Composite ◽  
Fire Damage ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Carbon Fiber Composite ◽  
Damage Level ◽  
Fiber Materials ◽  
Non Destructive

We apply THz imaging technology to evaluate fire damage to a variety of carbon fiber composite samples. The majority of carbon fiber materials have polarization-dependent reflectivities in the THz frequency range, and we show how the polarization dependence changes versus the burn damage level. Additionally, time domain information acquired through a THz time-domain spectroscopy (TDS) system provides further information with which to characterize the damage. The technology is discussed in terms of non-destructive testing applications to the defense and aerospace industries.

Infrared Thermography Non-Destructive Testing of Composite Materials

2011 ◽  
Vol 291-294 ◽  
pp. 1307-1310 ◽  
Author(s):  
Cui Qin Wu ◽  
Wei Ping Wang ◽  
Qi Gang Yuan ◽  
Yan Jun Li ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Composite Materials ◽  
Infrared Thermography ◽  
Fiber Composite ◽  
High Energy ◽  
Non Destructive Testing ◽  
Solid Rocket Motor ◽  
Destructive Testing ◽  
Inspection Method ◽  
Active Infrared Thermography ◽  
Non Destructive

To detect the delamination, disbond，inclusion defects of the glass fiber composite materials applied in the solid rocket motor, active infrared thermographic non-destructive testing(NDT) is researched. The samples including known defects are heated by pulsed high energy flash lamp. The surface temperature of the samples is monitored by infrared thermography camera. The results of the experiments show that the active infrared thermography technique is a fast and effective inspection method for detecting the defects of delamination, disbond，inclusion of the composites. The samples are also detected by underwater ultrasonic c-scans. The paper concludes that the active infrared thermography NDT is more suitable to rapidly detect the defect in large-area and the underwater ultrasonic c-scans is more suitable to quantitatively identify the defect in local-area.

scholarly journals Experimental Testing of Aramid Composite Applied in Ballistic Armour by Ultrasonic IR Thermography

2019 ◽  
Vol 10 (2) ◽  
pp. 79-88
Author(s):  
Monika PRACHT ◽  
Waldemar ŚWIDERSKI
Keyword(s):  
Experimental Testing ◽  
Source Parameters ◽  
Non Destructive Testing ◽  
Ir Thermography ◽  
Destructive Testing ◽  
X Ray ◽  
Testing Procedures ◽  
Input Source ◽  
Non Destructive ◽  
Reference Samples

Reference samples, in which artificial discontinuities (defects) are fabricated, are used to verify non-destructive testing procedures. Artificial discontinuities are known defects of reference samples and enable verification the feasibility of the verified NDT method for the identification of location and depth of discontinuities. Thermographic inspection of reference samples also helps to determine the required thermal input source parameters to test samples. This paper presents the results of experimental testing for ultrasonic IR thermography of defects in aramid composite laminate intended for light ballistic armour. Specimens of the aramid composite material included artificial defects and were inspected at various ultrasonic frequencies. Optical thermography and X-ray inspection were carried out on the same specimens, and their results were compared to those determined with ultrasonic IR thermography.

Destructive and Non-Destructive Testing of High Temperature Influence on Refractory Fiber Composite

2014 ◽  
Vol 982 ◽  
pp. 145-148 ◽  
Author(s):  
Ondřej Holčapek ◽  
Pavel Reiterman ◽  
Marcel Jogl ◽  
Petr Konvalinka
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Temperature ◽  
Fiber Composite ◽  
Cement Composites ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Refractory Fiber ◽  
Cement Binder ◽  
Non Destructive

The main aim of this contribution lies in the description of mechanical properties fiber cement composites after exposure to high temperatures. Destructive and non-destructive methods were used to investigate the influence of heat loading. The effect of refractory binder compared to common Portland cement binder was observed. Widespread non-destructive testing method can describe the changes of mechanical properties due to influence of external load e.g. high temperature at the level of 1000 °C. The tensile strength and compressive strength were investigated on specimens 40 x 40 x 160 mm. Before these destructive tests dynamic modulus of elasticity and tentative compressive strength were provided.

Non destructive testing of works of art by terahertz analysis

2013 ◽  
Vol 64 (2) ◽  
pp. 21001 ◽  
Author(s):  
Jean-Luc Bodnar ◽  
Jean-Jacques Metayer ◽  
Kamel Mouhoubi ◽  
Vincent Detalle
Keyword(s):  
Non Destructive Testing ◽  
Destructive Testing ◽  
Works Of Art ◽  
Non Destructive
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