Infrared thermography application to determine the linear mechanics cracks parameters

Heat generation in fatigue crack tip under cycling load was experimentally investigated in this work by infrared thermography. The set of experiments was carried out using the samples with pregrown fatigue crack. The spatial and time temperature evolution at the crack tip was studied. A mathematical algorithm of experimental data was realized to obtain heat power of source caused by the plastic deformation region at crack tip. The algorithm includes the part of relative motion compensation. As a result of the presented work, J-integral and stress intensity factor was obtained for cracks with pronounced the plastic zone.