Heating research on damage of composites on condition of vibration excitation

The vibrothermography technique was applied to detect: The surface temperature distribution of flat-panel component under different endogenous heat sources (instantaneous and periodical) was studied. The heating at the different forms of damage, including surface crack, subsurface delamination and internal debond, was simulated under vibration excitation by numerical finite element method. Typical composite component specimens with different types of damage including impact and fatigue were designed and produced, then detected by vibrothermography method with ultrasonic generator and infrared camera. The results prove the feasibility and advantages of the vibrothermography method for detecting interface damage in composite materials.