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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

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Transient thermography in the assessment of local fibre content in CFRP laminates

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Wróbel G. , Rdzawski Z. M. , Muzia G. , Pawlak S.

Journal of Achievements in Materials and Manufacturing Engineering

2008

tom Vol. 31, nr 2

385-390

Purpose: The main objective of the present work was to find relationships between achieved results of the thermal non-destructive testing and the local fibre content in carbon/epoxy composite materials. Design/methodology/approach: The experiments have been performed using thermography testing station designed and built specially for the purpose of the investigation. Each carbon/epoxy composite was prepared with different fiber content with the same total thickness of the specimens. Thermal non-destructive testing (TNDT) technique was employed to measure such parameters as threshold temperature rise, upper limit temperature and temperature growth rate on the specimen surface. The results achieved were then analysed and correlated with carbon fiber content. Findings: The study has assessed the ability of transient thermography to carry out a testing of fiber content in carbon/epoxy composite materials. The experimental results revealed relationship between fiber content and temperature growth rate from which the empirical formula for predicting local fiber content has been developed. Research limitations/implications: In order to obtain reliable results, there are many factors to be considered such as void content in composite matrix, type and quality of composite surface and others. Further work is needed in this area. Practical implications: The results obtained would be of considerable importance in the industrial applications to achieve a first estimate of local fiber content in polymer composite materials. Originality/value: A new approach to the problem of fibre content examination has been demonstrated by means of thermal non-destructive testing. The method developed should be of interest to the industrial quality control applications and has a great importance for the products with a high failure-free requirements.