Defect reconstruction by non-destructive analyzing methods as basis for fracture mechanical evaluation

Advanced ultrasonic inspection techniques analyze the defects performing a reconstruction which results in an image or the defects. A characterization of the defects is possible including a classification into cracklike or globular, a describtion of the position of a defect with respect to the surface its size in all direction an d possibly orientation. These ar parameters of high interest for fracture mechanic evaluation. At the IzfP several competitive analyzing techniques were developed. They include AOLK (Amplitude and Transit-Time Locus Curves), Sector scan and compound scan using phased arrays, Ultrasonic holography, SAFT (Synthetic Aperutre Focussing Technique). All of them result in a resonstructed image of reflectors inside the material. An overview is given over the state of the art of these techniques showing examples for different defects.