抄録
Microfracture dynamics in the delayed fracture of a maraging steel was investigated using multi-channel AE monitoring and advanced signal processing system. Source location and moment tensor analaysis of 7 channel monitoring system were utilized to determine both the fracture mode and theoretical transfer function of the specimen. Source wave was estimated by iteration of the out-of-plane displacement so as to best represent the corresponding measured displacement. Delayed fracture of maraging steel was found to be dominated by Mode-1 cracks of 10 to 30 μm in size. These cracks generated within 1 to 3 μ sec.
