| 摘要 |
A method of determining the breaking stress in shear for a part 10 of determined thickness and made of two elements 12, 14 bonded together by adhesive 16, comprising; using a plane sensor 18 to emit an ultrasound wave 22 at a nominal frequency towards the part; receiving at the sensor a reflected signal 24 comprising a plurality of echoes of the ultrasound wave being reflected on various interfaces 12A, 16A, 14A in the part; using a processor unit 20 to calculate a fast Fourier transform of the reflected signal; determining a Gaussian envelope connecting together the peaks of the resonances of the FFT; determining a frequency at which the Gaussian envelope is a maximum; and determining the breaking stress from a predetermined relationship between the maximum frequency of the Gaussian envelope and the breaking stress as previously recorded in the processor unit. |
