Ultrasonically stimulated thermography for crack detection of turbine blades

• Crack detection of turbine blades with vibrothermography techniques. New procedure understanding crack topology and the prediction preloads in cracks. Numerical analysis for optimising blade excitation. The hot gas components a have to withstand extreme loads. As failure could catastrophic consequences, integrity entire engine must always be guaranteed, hence quick reliable structural health monitoring (SHM) or nondestructive testing techniques (NDT) are essential. In this work, an ultrasonic stimulated thermographic test system was developed efficiently detect cracks blades. used technique is based on ultrasound excitation piezo actuator, where contact surfaces excited generate frictional heat, which captured by thermal imaging camera. A method developed, temperature increase measured as function electrical energy supply actuator. This allows crack. were conducted frequency type damage experienced basic physics coupling between configuration, local velocity increase. presented helps optimize inspection cycles these components.