SU728071A1 - Method of measuring elastic stresses in ferromagnetic materials - Google Patents
Method of measuring elastic stresses in ferromagnetic materials Download PDFInfo
- Publication number
- SU728071A1 SU728071A1 SU782664200A SU2664200A SU728071A1 SU 728071 A1 SU728071 A1 SU 728071A1 SU 782664200 A SU782664200 A SU 782664200A SU 2664200 A SU2664200 A SU 2664200A SU 728071 A1 SU728071 A1 SU 728071A1
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- SU
- USSR - Soviet Union
- Prior art keywords
- elastic stresses
- barkhausen
- axis
- stresses
- jumps
- Prior art date
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
Изобретение относитс к области неразрушающего контрол ферромагнитных материалов методами магнитошумовой дефектоскопии и может быть исйольэовано в приборостроительной, машиностроительной и авиационной промышленности.The invention relates to the field of non-destructive testing of ferromagnetic materials by magnetic noise defect detection methods and can be used in the instrument-making, engineering and aviation industries.
Известен способ неразрушающего контрол на основе скачков Баркгаузена , заключающийс в том, что контролируемый материал перемагничивают полем низкой частоты, регистрируют поток скачков Баркгаузена и по его параметрам суд т о значении контролируемых ..величин 1 . There is a known non-destructive testing method based on Barkhausen jumps, which means that the controlled material is re-magnetized by a low-frequency field, a flow of Barkhausen jumps is recorded, and its parameters judge the value of the controlled values 1.
Наиболее близким техническим решением к изобретению вл етс спосо измерени упругих напр жений в ферромагнитных материалах, заключающийс в том, что испытуемую детгшь перемагничивают переменным магнитным полем, силовые линии которого параллельнь оси упругих напр жений, регистрируют скачки Баркгаузена и измер ют статистические параметры по тока скачков Баркгаузена 2.The closest technical solution to the invention is the method of measuring elastic stresses in ferromagnetic materials, which means that the subject is re-magnetized by an alternating magnetic field whose force lines parallel to the axis of elastic stresses, register Barkgausen jumps and measure Barkgausen jump current statistics 2
Недостатками известных способов вл етс низка точность измерени упругих напр жений , обусловленна тем, что эффект Баркгаузена в эначительной мере зависит от структуры ферромагнитных материалов, поэтому изменение параметров потока скачков Баркгаузена за счет структурных изменений, происход щих, например, при вариации режимов термообработки в пределах технических условий, могут даже превышать аналогичные изменени параметров, обусловленные упругими напр жени ми. Значительное вли ние на точность измерений оказывает также пластическа деформаци материалов .The disadvantages of the known methods are the low accuracy of the measurement of elastic stresses, due to the fact that the Barkhausen effect depends to a great extent on the structure of ferromagnetic materials, therefore the change in the flow parameters of the Barkhausen jumps due to structural changes occurring, for example, when the heat treatment modes vary conditions may even exceed similar changes in parameters due to elastic stresses. Plastic deformation of materials also has a significant effect on measurement accuracy.
Целью изобретени вл етс повышение точности измерени .The aim of the invention is to improve the measurement accuracy.
Поставленна цель достигаетс тем, что испытуемую деталь дополнительно перемагничивают в направлении, перпендикул рном оси упругих напр жений, измер ют разницу статистических параметров потока скачков Баркгаузена и наход т значение разницы при этих измерени х и по ней суд т о величине упругих напр жений.The goal is achieved by the fact that the test piece is additionally reversible in the direction perpendicular to the axis of elastic stresses, the difference in statistical parameters of the Barkhausen jumps flow is measured and the difference in these measurements is determined and judged by the magnitude of the elastic stresses.
При неизвестном направлении оси механических напр жений поворачивают оси перемагничивани в плоскости образца до тех пор,, пока от;носительное значение разницы статистических параWith an unknown direction, the axes of mechanical stresses rotate the axes of the magnetization reversal in the sample plane until the relative value of the difference of statistical pairs
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU782664200A SU728071A1 (en) | 1978-09-20 | 1978-09-20 | Method of measuring elastic stresses in ferromagnetic materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU782664200A SU728071A1 (en) | 1978-09-20 | 1978-09-20 | Method of measuring elastic stresses in ferromagnetic materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU728071A1 true SU728071A1 (en) | 1980-04-15 |
Family
ID=20785283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU782664200A SU728071A1 (en) | 1978-09-20 | 1978-09-20 | Method of measuring elastic stresses in ferromagnetic materials |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU728071A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4599563A (en) * | 1983-10-04 | 1986-07-08 | American Stress Technologies, Inc. | Barkhausen noise method for analyzing the anisotropic properties of ferromagnetic steel |
| US4931730A (en) * | 1986-02-17 | 1990-06-05 | Dam Patent A/S | Method and apparatus for non-destructive materials testing and magnetostructural materials investigations |
-
1978
- 1978-09-20 SU SU782664200A patent/SU728071A1/en active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4599563A (en) * | 1983-10-04 | 1986-07-08 | American Stress Technologies, Inc. | Barkhausen noise method for analyzing the anisotropic properties of ferromagnetic steel |
| US4931730A (en) * | 1986-02-17 | 1990-06-05 | Dam Patent A/S | Method and apparatus for non-destructive materials testing and magnetostructural materials investigations |
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