TABLE OF CONTENTS Full Text

Introduction Acceptability requirements Physical interaction for the crack detection Practical applications and experimental verification of the model Inclined notch, Inner crack Geometrical and physical properties of the crack Conclusion References

Abstract

For the ultrasonic methods the limiting influences on the crack detectability will be discussed considering three different aspects: 1. Acceptability requirements for cracks, 2. Physical interactions used for the detection, 3. Geometrical and physical properties of the crack. The examples of the precedent chapters have shown that much is depending on the geometrical situation of the crack (close to the surface or surface breaking or within the volume), on its orientation and also on the shape of the crack conture. The conture influences are especially of interest in cases of the application of TOFD approaches or approaches where the diffracted energy is mainly used for the detection.