Abstract
This paper presents two infrared thermography methods with CO2 Laser excitation and microwave excitation applied to defect detection in CFRP. The tests were conducted with two specimens, one with defect, and another one without defect. On two concrete plates 40 cm× 40 cm× 4.5 cmwere reinforced by CFRP; the defects were made by the absence of adhesive on an area10 cm× 10 cm. The specimens were heated by microwave, generated by a commercial magnetron of 2.45 GHz and guided by a pyramidal horn antenna, with a power of 360 W within 150 s. Another series of the tests was conducted with CO2 Laser, wavelength 10.6 μm, by heating the samples with a power of 300 W within 40 s. An infrared camera sensitive to medium waves in range of 3 - 5 μm, with a detector of 320 × 256 matrix detector in InSb (Indium Antimonide), was used to record the thermograms. As a result, the CO2 Laser excitation is better for the delamination detection in CFRP. This study opens interesting perspectives for inspecting other types of defects in materials sciences; the microwave excitation is suitable for the deep defects in the materials whereas the CO2 Laser excitation is better for the defects near the surface of the materials.
Highlights
Composite materials have attracted a lot of attention from researchers in materials sciences
This paper presents two infrared thermography methods with CO2 Laser excitation and microwave excitation applied to defect detection in Carbon Fiber Reinforced Polymer (CFRP)
On two concrete plates 40 cm × 40 cm × 4.5 cm were reinforced by CFRP; the defects were made by the absence of adhesive on an area 10 cm × 10 cm
Summary
Composite materials have attracted a lot of attention from researchers in materials sciences. Carbon Fiber Reinforced Polymer (CFRP) has been popularly used in repairing and strengthening the structures in civil engineering [1,2,3,4]. In these techniques, the loss of the adhesives can cause the delamination of the CFRP from the repaired or strengthened elements [5]. The loss of the adhesives can cause the delamination of the CFRP from the repaired or strengthened elements [5] This type of defects has been inspected by various infrared thermography methods [6,7,8]. The thermograms from the analysis with the contrast algorithm and the temperature evolution of the surface of the specimen for both methods are compared
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