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2 Journal of Achievements in Materials and Manufacturing Engineering

2 2009

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The application of transient thermography The application of transient thermography fibre/epoxy composites

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

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 36, nr 1

49-56

Purpose: Primary purpose of the present experimental study was to evaluate the local fibre content in carbon fibre/epoxy composites using transient thermography. Design/methodology/approach: The experiments have been performed using transient thermography to obtain the thermograms for carbon/epoxy specimens with different carbon fibre content. From obtained thermograms the thermal diffusivity values were determined and compared for each specimen and correlated with carbon content. The composites were two times tested using two different heating conditions to check the conformity of determined diffusivity values. Findings: It was found from obtained results that composites with different carbon fibre content had different values of thermal diffusivity, indicating that transient thermography can be considered as a non-destructive testing method for fiber content evaluation in CFRP composites. Research limitations/implications: Developed empirical formula is not universal for any other fibre reinforced polymer composite, so different relationships should be determined for different composites. Practical implications: The results obtained from present experiment would be of great importance in the industrial applications to obtain first estimate of carbon fibre content in fibre reinforced composite materials. Originality/value: The originality of present investigation is in application of transient thermography for local fibre content evaluation in polymer composite materials. The method should be of interest for the industrial quality control applications and is of great importance for composite products with high failure-free requirements.

Determination of thermal diffusivity of carbon/epoxy composites with different fiber content using transient thermography

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

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 37, nr 2

518-525

Purpose: The purpose of present study was to determine the thermal diffusivity of carbon fibre/epoxy composites with different fibre content using flash method. Design/methodology/approach: The experiments have been performed using transient thermography to obtain the thermograms for carbon/epoxy specimens with different carbon fibre content. From recorded thermograms the thermal diffusivity values were determined for two different heating conditions to verify the effect of heating conditions on thermal diffusivity values. Findings: It was found from obtained results that composites with different carbon fibre content had different values of thermal diffusivity. The method initially proposed by Parker as “flash method” for the thermal diffusivity measurements of homogeneous solids was successfully applied to determine thermal diffusivity of CFRP composites. Relationship showed that the thermal diffusivity is linear function of carbon content in considered materials. Research limitations/implications: Developed relationships between thermal diffusivity and fibre content is not universal for any other carbon fibre reinforced composites (manufactured using different technique and/or using different constituent materials), so different relationships should be determined for different composites. Practical implications: The results obtained from present experiment would be of great importance in the industrial or laboratory applications to determine thermal diffusivity in carbon fibre reinforced composite materials. Originality/value: The originality of present investigation is in application of transient thermography based on flash method approach to measure thermal diffusivity of carbon/epoxy composites.