Nondestructive method of quantitatively evaluating degree of plasticity of steel material
US6111405A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Jul 17, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/204
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a nondestructive method of quantitatively evaluating a degree of plasticity of ferromagnetic materials, a magnetic field of a surface of a ferromagnetic test body is measured using a magnetic sensor, and the surface of the ferromagnetic test body is partitioned into regions corresponding to domains of the ferromagnetic test body. A difference between a maximum value and a minimum value of a magnetic signal corresponding to the magnetic field for each of the domains is calculated as a spatial difference amount. A distribution width of the spatial difference amounts and an amount of residual strain corresponding to an amount of plastic deformation of the ferromagnetic test body is measured. A correlation between the distribution width of the spatial difference amounts and the amount of residual strain is calculated. A degree of plasticity of the ferromagnetic test body in calculated in accordance with the correlation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.