Title :
Detection of crack closure in time-resolved acoustic microscopy
Author :
Knauss, D. ; Zhai, T. ; Briggs, G.A.D. ; Martin, J.W.
fDate :
Oct. 31 1994-Nov. 3 1994
Abstract :
Acoustic microscopy with time-of-flight measurements of short pulses has been used to detect the closure of short cracks. Operating the microscope in the pulse mode, the reflections from inclined cracks have been measured and a diffraction model for calculating the amplitude of these reflections as a function of the lens position was developed. The detected signal amplitudes depend on the size of the crack and on the contact between the crack faces
Keywords :
acoustic microscopy; acoustic pulses; acoustic signal detection; crack detection; ultrasonic diffraction; ultrasonic materials testing; ultrasonic reflection; 230 MHz; amplitude; crack closure detection; crack face contact; crack size; detected signal amplitudes; diffraction model; fatigue cracks; lens position; pulse mode; reflections; short pulses; time-of-flight measurements; time-resolved acoustic microscopy; Acoustic diffraction; Acoustic microscopy; Acoustic pulses; Acoustic reflection; Acoustic signal detection; Acoustic testing; Crack detection; Nondestructive testing;
Conference_Titel :
Ultrasonics Symposium, 1994. Proceedings., 1994 IEEE
Conference_Location :
Cannes, France
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1994.401858
