5 April 2017 Assessment of delamination in composite beam using infrared thermography, optical sensors and terahertz technique
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Abstract
Composite materials find wide ranging applications due to their high strength-to-weight ratio. Due to this increasing dependence on composite materials there is a need to study their mechanical behavior in case of damage. There are several ENDT and SHM methods for the assessment of the mechanical properties each with their set of advantages and disadvantages. The paper presents a comparative study of three distinct damage detection methods (infrared thermography, neutral axis method based on optical strain sensor measurements and terahertz spectroscopy) for the detection of delamination in a simple GFRP beam-like structure.

Each of the methods have their own set of advantages and disadvantages. The terahertz spectroscopy is a specialized technique suitable for detecting deterioration inside the structure, but is not suitable for in performance monitoring. Similarly the infrared thermography technique in the active domain may be used for in situ monitoring but not in in-service assessment. Both methods allow the visualization of the internal structure and hence allow identification of the type and the extent of damage. Fibre optic sensors (especially FBG) due to their small diameter and no need of calibration can be permanently integrated within the sample and applied for continuous dynamic strain measurements. The measured strain is treated as an input for neutral axis (NA) method, which as a damage sensitive feature may be used for in-service monitoring but gives absolutely no information about the type and extent of damage.

The results for damage detection based on proposed comparative studies give a complete description of the analyzed structure.
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Katarzyna Majewska, Katarzyna Majewska, Rohan Soman, Rohan Soman, Magdalena Mieloszyk, Magdalena Mieloszyk, Wieslaw Ostachowicz, Wieslaw Ostachowicz, } "Assessment of delamination in composite beam using infrared thermography, optical sensors and terahertz technique", Proc. SPIE 10170, Health Monitoring of Structural and Biological Systems 2017, 1017005 (5 April 2017); doi: 10.1117/12.2258592; https://doi.org/10.1117/12.2258592
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