Kamiya K., Yasuda K.

So far, many techniques for detecting cracks in a tructure or machine using its dynamical response have been proposed. Most of the techniques assume that the cracks are open crack which is always open during the vibration. However many of the actual fatigue cracks are breathing crack which opens and closes during the vibration. In previous reports, the authors proposed a technique for detection of breathing cracks in a vibrating beam using its dynamical response, and confirmed its applicability by numerical simulation and experiment. In this report, the technique is extended to a frame structure composed of beams. The applicability of the extended technique is confirmed by numerical simulation.