Our study deals with the quantification of the energy dissipated by a defect of spalling on the outside ring of a rolling bearing. A previous work showed a correlation between the thermal heating and the vibratory level generated by the progressive appearance of the defect. First, we propose a numerical model of the heat transfers In a second time, we developed an experimental setup. The result...

The contribution deals with state of the art non-destructive testing method – active infrared thermography. The method can be used for revealing of defects and inhomogenities inside the bodies, e.g. bubbles and cracks in materials, which can have crucial importance from the point of view of their physical-mechanical properties. Goal of the research is theoretical evaluation of the performance o...

A three-dimensional unsteady inverse model has been developed in order to compute heat fluxes and surface temperature in various configurations. Temperature measurements are taken backside using infrared thermography. The number of unknown parameters is reduced using a discrete cosine transform analysis and by canceling values lower than a prescribed level. The efficiency of the method is prove...

In order to better understand the thermomechanical behavior of the skin and its direct environment, we present an experimental study using infrared thermography. This experimental study aims to highlight quantitatively some effects of blood flow on the heat diffusion. The originality of this research is to change the blood flow by using effects of gravity and to quantify the temperature changes...

A three-dimensional unsteady inverse model has been developed in order to compute heat fluxes and surface temperature in various configurations. Temperature measurements are taken backside using infrared thermography. The number of unknown parameters is reduced using a discrete cosine transform analysis and by canceling values lower than a prescribed level. The efficiency of the method is prove...

A modification of the Angstroem's method for measurement of thermal diffusivity is presented. The Angstroem's method relies upon the steady-periodic propagation of temperature waves along the specimen. The diffusivity is recovered from combination of phase shift and amplitude decay of the waves, measured by infrared thermography, under the hypothesis of virtually semi-infinite specimen, that is...

This paper compares the effectiveness of the dTnorm and t90_10 parametrizations in dynamic thermography for imaging location of perforators in TRAM flaps in the intraoperative period. The results were compared with the location detected in a Doppler ultrasound examination. Cold and heat stimulation was used in dynamic thermography. Additionally, these results were compared with static thermogra...

The use of infrared thermography for the identification of lameness in cattle has increased in recent years largely because of its non-invasive properties, ease of automation and continued cost reductions. Thermography can be used to identify and determine thermal abnormalities in animals by characterizing an increase or decrease in the surface temperature of their skin. The variation in superf...

BACKGROUND Failure to achieve properly localized, permanent tissue destruction is a common cause of arrhythmia recurrence after cardiac ablation. Current methods of assessing lesion size and location during cardiac radiofrequency ablation are unreliable or not suited for repeated assessment during the procedure. MRI thermography could be used to delineate permanent ablation lesions because tiss...

This study develops and demonstrates a new method to locate track multiple fatigue damages in large-scale composite structures subject cyclic loads using thermography computer vision. Progressive generate thermal features due material friction, allowing efficient detection passive thermography. Automated damage localization evaluation are done by image processing incorporated with thermodynamic...