Pulsed thermography model for detecting the internal ferritic steel crack

The cracks in steel parts may occur near the contact surfaces under the effect of concomitant constraints. The growth mechanisms crack and its emergence are not currently known with certainty. With the finite element method we have developed a mathematical model to determine the crack depth from the standard thermal contrast taking into account of the contrast time values. We found that the flux density and pulse duration have no remarkable influence on the thermal image samples. We calculated the proposed model accuracy, and the optimal value of the theoretical measurement time. The simulation results show that pulsed thermography is adapted to inspection and characterization the internal cracks into steel.