Crack Detection using Non-linear and Dissipative Acoustics

University essay from Blekinge Tekniska Högskola/Institutionen för maskinteknik

Author: Daniel Carldén; Daniel Thuresson; [1998]

Keywords: Non-linear acoustics; Non-linear parameter; Burger s equation; Bessel-Fubini; Fay; Mendousse; Hedberg; Non-destructive testing NDT ; Non-destructive Evaluation NDE ; crack detection.;

Abstract: A theoretical model for identification of acoustical non-linearity using Burger's equation was implemented in a MATLAB program. The program identified both the non-linearity parameter and the distance from the signal source. Tests were performed in order to verify the theories. Tests with a steel bar showed no detectable non-linearity, probably due to insufficient wave amplitude by the signal source. A crack model was made with successful result.

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