This paper presents a non-destructive technique (NDT) using active infrared thermography and FEM analyses with Comsol Multiphysics software applied for thermal distribution detection through reinforced concrete. For this work a reinforced concrete slab was created having a parallelepiped shape, the length and the width of 400 mm and the thickness of 50 mm. The concrete slab was reinforced using a rebar mesh of 18 mm diameter. The experimental installation consisted of an electrical heating source and a steel frame for fixing the slab and for the thermal distribution analyses an infrared camera was used. The same type of material and conditions like in the laboratory was used for the FEM analyses in Comsol Multiphysiscs to compare with the experimental part. A concrete slab without steel was used to determine the difference between the simple concrete and reinforced concrete in the heat transfer process.
The present paper presents an optimization model for quality control of industrial products by using two non-destructive techniques (NDT): infrared termography and ultrasonic methods. The main purpose it is to determinate the best analyzing method using multi-criteria analysis by taking into account the results that outcome from the two non-destructive evaluations. There have been studied defects like: internal defects and surface defects. Therewith were taking into consideration: safety, efficiency of the method and the cost of the equipment used in controlling the product. For this study it was created a concrete slab with embedded defects which had different depths. The sample was tested using active thermography and impact echo methods and the results were studied and integrated in an multi-criteria analysis to reveal the best method for this case.
The present paper presents a non-destructive technique (NDT) using active pulse infrared thermography with a thermal excitation consisting in two photographic flash laps controlled by a signal generator. For this work we used two bioceramics samples, having the same size, 15, 30 mm diameter and 3, 75 mm thickness. A non-defect sample was used as the basis to demonstrate the temperature differences in the defected zone between the healthy and the defective one. In the second sample was created an internal defect. The main advantage of this method represents its possibility to detect the internal defects in bioceramic materials, the method being more reliable then the microscopic method. Other two advantages of this method are represented bythe rapidity of testing and the maintenance of material properties after the thermal excitation.
This paper presents a non-destructive technique (NDT) using active infrared thermography and the thermal excitation consisting in an electric plane, applicable for bio ceramic surface micro-defects detection. For this work we chose to study samples made of bio-ceramic (hydroxyl-apatite), having a cylindrical form with a diameter of ¢ = 15.20 mm and a thickness of 2.00 mm. The aim of this paper was to study the influence of surface defects in the heat transfer process for the bio-ceramic materials. The advantages of this method are the rapidity of determining and the safety of the material structure after the thermal excitation. For the concluding results there are necessary only a few seconds and a temperature difference of few Celsius degrees to discover the defect and the heat loss on the sample surface.
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