G - Physics – 01 – N
Patent
G - Physics
01
N
324/48
G01N 27/72 (2006.01) G01N 33/20 (2006.01)
Patent
CA 1185659
ABSTRACT A non-destructive method of measuring the fatigue limit of a ferro- magnetic test piece by use of the mechanical Barkhausen noise phenomenon. The test piece is cyclically loaded with continuously or incrementally increasing amplitude in the presence of absence of a stable magnetic field by which the test piece is magnetized and, simultaneously, measurement is made of the maximum value obtained as a function of one of the effective value, the size distribution and the mean value of the mechanical Barkhausen noise pulses induced during fatigue of the test piece. The loading amplitude at which such maximum value is reached cor- responds to a fatigue strength equal to the fatigue limit of the test piece, the latter having been subjected to a prior loading process to create a lattice defect pattern in the test piece when no stable magnetiz- ing field is present. The prior loading process comprises the steps of cyclically loading the test piece externally with continuously or incrementally increasing amplitude and simultaneously measuring the changes in the effective value, size distribution or mean value of the mechanical Barkhausen noise pulses induced during fatigue of the ferro- magnetic test material caused by such loading and decreasing the external loading to zero. This method offers the notable advantage that the endurance or fatigue limit can, in practice, be determined very quickly - for example, in a period of only 15 minutes. Therefore, the method can in practice be applied to determine immediately whether or not the dynamic loading of a machine part is too large.
390202
Kettunen Pentti
Ruuskanen Pekka
Borden Ladner Gervais Llp
Kettunen Pentti
Ruuskanen Pekka
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