A global non-destructive testing technique for detecting cracks in metal parts has been developed and the factors affecting its sensitivity investigated. A sample is excited at very-high-order modes of vibration at two frequencies and the frequency mixing measured. Experiments with fatigue-cracked steel beams demonstrate that these defects produce a strong mixing effect and that the signal relating to the frequency mixing is sensitive to the length of the crack. The sensitivity is also shown to be reliant on the modes of vibration used.
|Translated title of the contribution||The factors affecting the sensitivity of the ultrasonic inter-modulation technique|
|Title of host publication||33rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Portland, Oregon, USA|
|Publisher||American Institute of Physics (AIP)|
|Pages||1616 - 1623|
|Publication status||Published - 30 Jul 2006|
Bibliographical noteConference Proceedings/Title of Journal: AIP Conference Proceedings 894
Conference Organiser: Center for Nondestructive Evaluation at Iowa State University