Abstract
In brittle materials, unstable crack-extension leads to direct fracture. Therefore, some techniques such as Xray scanning, Ultrasonic microscopy, Acoustic Emission (A. E.) method have been developed for detecting the position and size of defects. However, these techniques do not have enough high precision. We have analysed crack-size and crack-orientation distributions of fracture origins statistically and proposed an effective method for non-destructive inspection (N. D. I.). In this paper, joint probability density contour-lines of fracture-location in test pieces subjected to 3-point bending load are shown. Furthermore, “N. D. I. -line” calculated from the joint cumulative distribution function is presented. More effective “screening-diagram” derived from N. D. I. -line is also suggested.
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