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1. 发明专利

GB2120385B METHOD FOR MEASURING FATIGUE STRENGTH OF FERROMAGNETIC MATERIALS NON-DESTRUCTIVELY 未知
公开(公告)号：GB2120385B
公开(公告)日：1985-07-31
申请号：GB8318424
申请日：1981-11-18
申请人： RUUSKANEN PEKKA , KETTUNEN P
发明人： RUUSKANEN PEKKA , KETTUNEN PENTTI
IPC分类号： G01N27/72 , G01N33/20
摘要： PCT No. PCT/FI81/00086 Sec. 371 Date Jun. 23, 1983 Sec. 102(e) Date Jun. 23, 1983 PCT Filed Nov. 18, 1981 PCT Pub. No. WO83/01836 PCT Pub. Date May 26, 1983.A non-destructive method for using the mechanical Barkhausen noise phenomenon, caused in fereromagnetic materials by the dislocation motion and the changing external mechanical loading, especially in determining the fatigue strength of the material. The test piece is cyclically loaded with continuously or incrementally increasing amplitude in the presence or 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 corresponds 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 magnetizing 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 ferromagnetic test material caused by such loading and decreasing the external loading to zero.

2. 发明专利

GB2120385A METHOD FOR MEASURING FATIGUE STRENGTH OF FERROMAGNETIC MATERIALS NON-DESTRUCTIVELY 未知
公开(公告)号：GB2120385A
公开(公告)日：1983-11-30
申请号：GB8318424
申请日：1981-11-18
申请人： RUUSKANEN PEKKA , KETTUNEN P
发明人： RUUSKANEN PEKKA , KETTUNEN PENTTI
IPC分类号： G01N27/72 , G01N33/20
摘要： PCT No. PCT/FI81/00086 Sec. 371 Date Jun. 23, 1983 Sec. 102(e) Date Jun. 23, 1983 PCT Filed Nov. 18, 1981 PCT Pub. No. WO83/01836 PCT Pub. Date May 26, 1983.A non-destructive method for using the mechanical Barkhausen noise phenomenon, caused in fereromagnetic materials by the dislocation motion and the changing external mechanical loading, especially in determining the fatigue strength of the material. The test piece is cyclically loaded with continuously or incrementally increasing amplitude in the presence or 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 corresponds 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 magnetizing 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 ferromagnetic test material caused by such loading and decreasing the external loading to zero.

3. 发明专利

CA1185659A METHOD OF MEASURING FATIGUE STRENGTH OF FERROMAGNETIC MATERIALS NON-DESTRUCTIVELY 未知
公开(公告)号：CA1185659A
公开(公告)日：1985-04-16
申请号：CA390202
申请日：1981-11-17
申请人： RUUSKANEN PEKKA , KETTUNEN P
发明人： RUUSKANEN PEKKA , KETTUNEN PENTTI
IPC分类号： G01N27/72 , G01N33/20
摘要： A non-destructive method of measuring the fatigue limit of a ferromagnetic 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 corresponds 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 magnetizing 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 ferromagnetic 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.

4. 发明专利

FI62732C 未知
公开(公告)号：FI62732C
公开(公告)日：1983-02-10
申请号：FI813161
申请日：1981-10-12
申请人： RUUSKANEN PEKKA , KETTUNEN P
发明人： RUUSKANEN PEKKA , KETTUNEN PENTTI
IPC分类号： G01N27/72

5. 发明专利

SE8303758L 未知
公开(公告)号：SE8303758L
公开(公告)日：1983-07-01
申请号：SE8303758
申请日：1983-07-01
申请人： RUUSKANEN PEKKA , KETTUNEN P
发明人： RUUSKANEN PEKKA , KETTUNEN PENTTI
IPC分类号： G01N27/72

6. 发明专利

FI62732B 未知
公开(公告)号：FI62732B
公开(公告)日：1982-10-29
申请号：FI813161
申请日：1981-10-12
申请人： RUUSKANEN PEKKA , KETTUNEN P
发明人： RUUSKANEN PEKKA , KETTUNEN PENTTI
IPC分类号： G01N27/72

7. 发明专利

FI60934B 未知
公开(公告)号：FI60934B
公开(公告)日：1981-12-31
申请号：FI801615
申请日：1980-05-20
申请人： RUUSKANEN PEKKA , KETTUNEN P
发明人： RUUSKANEN PEKKA , KETTUNEN PENTTI
IPC分类号： G01N27/72

8. 发明专利

SE452196B Procedure for non-disruptive measurement of strength properties in ferromagnetic material 未知
公开(公告)号：SE452196B
公开(公告)日：1987-11-16
申请号：SE8303758
申请日：1983-07-01
申请人： RUUSKANEN PEKKA , KETTUNEN P
发明人： RUUSKANEN PEKKA , KETTUNEN PENTTI
IPC分类号： G01N27/72
摘要： A procedure to use the mechanical Barkhausen noise effect, which in ferromagnetic materials results from dislocation movements and a variable outer mechanical load, as a non-disruptive measurement method, especially for determination of a material's output strength properties. The method entails two types of implementation, of which the first has the following steps. A test sample (a) is externally loaded (step 1) for example following a cyclical or corresponding method, whereby the amplitude continuously increases (fig. 2) and in this way a dominant arrangement of atom-lattice defects is achieved with focus on the non-reversible magnetisation changes in the test sample. At the same time are measured changes in the square value, frequency, quantity division, or mean value of the mechanical Barkhausen noise pulses, which are induced during the output testing of the ferromagnetic material (b-f). Then (step 2) the external load is withdrawn. After this (step 3) the test sample (a) is externally loaded, for example through cyclical loading which continually increases in amplitude (fig. 2b) and at the same time the max value is measured, which appears in the square value, frequency, quantity division, or mean value of the mechanical Barkhausen noise pulses, induced during the output testing of the ferromagnetic material. The load amplitude corresponding to the measured max value also corresponds to the output strength (output limit) of the test sample (fig. 2b). In the second implementation the test sample is magnetised with the help of a constant magnetic field, in which case steps 1 and 2 of the first implementation are omitted, and measurement of the maximum point corresponding to the output strength (output limit) of the test sample is carried out according to step 3 of the first implementation.

9. 发明专利

SE8303758D0 未知
公开(公告)号：SE8303758D0
公开(公告)日：1983-07-01
申请号：SE8303758
申请日：1983-07-01
申请人： RUUSKANEN PEKKA , KETTUNEN P
发明人： RUUSKANEN PEKKA , KETTUNEN PENTTI
IPC分类号： G01N27/72

10. 发明专利

FI60934C 未知
公开(公告)号：FI60934C
公开(公告)日：1982-04-13
申请号：FI801615
申请日：1980-05-20
申请人： RUUSKANEN PEKKA , KETTUNEN P
发明人： RUUSKANEN PEKKA , KETTUNEN PENTTI
IPC分类号： G01N27/72

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