G - Physics – 01 – N
Patent
G - Physics
01
N
73/83
G01N 3/32 (2006.01) G01H 13/00 (2006.01)
Patent
CA 1141195
A B S T R A C T A method for measuring crack propagation in samples as a function of the number of load cycles is proposed where- in changes in the frequency response of a mechanical im- pedance of a sample which is to be tested is registered. At a pulsation frequency, which corresponds to the resonant frequency of the sample, there is a rise in the resonance of the mechanical impedance, defined as the quotient of the speed of movement of the sample and the applied puls- ating force. Since, when a crack growth in the sample, its elastic constant decreases along with the cross-section- al area, the frequency response of the sample shifts towards lower frequences. To carry out the process of the invention it is suggested that the phase of the above mentioned im- pedance or an impedance which is dependent on it should be detected, or else to register the impedance magnitude whilst keeping the force acting on the sample or the speed of movement constant, or else to register the force or speed of movement as a function of the number of load cycles and standardised with respect to the appropriate values of momentary load or speed of movement. -- 1 --
330515
Sherman
Swiss Aluminium Ltd.
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