Abstract
Ultrasonic testing using a normal incident longitudinal wave is treated for sizing a closed crack. The crack exists vertically on the back wall of a plate inspected. Reflection and transmission of the wave at the closed crack surfaces are analysed by introducing a model of crack closure. The model includes a stress closing the crack and a phase shift of the reflected and trasmitted waves as unknown parameters. The unknown parameters have been determined together with the unknown length of the crack by analysing the inverse problem, which compares the back-wall echo height obtained through both theory and experiment. Two kinds of cracks introduced by different stress ratio in fatigue have been examined. The ultrasonic measurements for specimens have shown that the present analysis offers a powerful tool for precise sizing of closed vertical crack.
| Original language | English |
|---|---|
| Pages (from-to) | 2395-2402 |
| Number of pages | 8 |
| Journal | Transactions of the Japan Society of Mechanical Engineers Series A |
| Volume | 57 |
| Issue number | 542 |
| DOIs | |
| Publication status | Published - 1991 |
Keywords
- Crack
- Crack Closure
- Inverse Problem
- Nondestructive Inspection
- Ultrasonic Inspection
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering