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6th Edition of International Conference on

Materials Science and Engineering

March 18-20, 2024 | Singapore

Materials 2021

Waldemar Swiderski

Speaker at MINERALS, METALLURGY AND MATERIALS 2021 - Waldemar Swiderski
Military Institute of Armament Technology, Poland
Title : Detection of defects in CFRP composites by optical thermography methods


CFRP (Carbon Fiber Reinforced Plastic) composites are increasingly used in a variety of applications. Non-destructive testing methods are used for evaluating their condition both as a finished product and during their use. Damage that may occur in these types of composites includes air bubbles, non-uniform arrangement of fibers, regions of fibers not saturated with resin, delamination, and micro-cracks. Various methods of non-destructive testing are used to detect defects in such structures among the most effective of which are infrared thermography methods, the most common being optical heating with various types of lamps and the method of optical lock-in. Pulsed thermography is one of active IR techniques in which a surface of tested material is stimulated by a short heat pulse and the thermal response of the material is analysed. Flash thermography is used when the specimen is stimulated using a short energy pulse. The response contains information about subsurface material defects. After the heat pulse the temperature decrease rate is different on surface over defect in comparison to that over the sound material. In lock-in thermography, an amplitude modulated heat wave is applied to the inspected specimen in steady state. This paper seeks to compare the results obtained from pulsed and flash thermography with results from using optical lock-in thermography. The paper presents selected results of defect detection in a multilayer CFRP composite structure. The tests were carried out on a sample consisting of three plates made of CFRP connected with resin, in which the inner middle layer is made of four non-adherent elements.

Audience take away:
The presentation will allow: choosing the most effective non-destructive testing method for CFRP composites, determining the limitations of the described methods, and improving the results obtained with these methods.


Dr. Swiderski studied at the Department of Electro- Mechanical Arms of Military University of Technology and graduated as MS in 1978. He received his DSc degree in 2000 at the Military Institute of Armoured&Automative Technology. Post-doctoral degree in technical sciences received in 2012 (construction and operation of machinery). Since 1980, an employee of Military Institute of Armament Technology, at present an associate professor. Research interests include non-destructive testing using infrared thermography and uses infrared technology in military applications. Author and co-author of more than 200 publications and 11 patents. He received numerous state and scientific awards and distinctions for scientific activity.