The present invention relates to a device for measuring residual stress and hardness. Residual stress remaining in a metallic material due to deformation, thermal stress, or the like is a cause of various problems including degradation of mechanical properties such as fatigue strength and fracture properties and difficulty in post-processing. It is very difficult to derive a calibration curve when measuring stress by an existing non-destructive Barkhausen noise measurement method. When cross points of Barkhausen noise measurements for three or more stresses are not at one position, calibrated curves can be easily found by scaling the Barkhausen noise measurements by using calibration equations of the present invention to collect the cross points at a unique position, thereby providing a practical method of easily measuring stress of a metal by a Barkhausen noise measurement method. Therefore, according to the present invention, it is found that the internal microstructure and surface residual stress of a metal cause crossing points not to be at a unique position in a conventional Barkhausen noise measurement experiment. In addition, basic physical properties and surface residual stress of a metallic material may be measured using the above-mentioned physical feature.

A wire rope inspection method performs second differential processing on a positive component or a negative component of a first-order differential waveform. Then, the positive component of the second-order differential waveform and an absolute value of the negative component of the second-order differential waveform are added in a state in which portions of the second-order differential waveform indicating the abnormal portion of the wire rope are shifted to overlap with each other. Then, the abnormal portion of the wire rope is determined based on the generated composite waveform.

An inspection device is provided for inspecting metallic objects extending in planar fashion, in particular sheets or walls. The inspection device is embodied as pipeline-impassable in particular by virtue of dispensing with at least one propulsion element that at least substantially fills an inner pipeline cross section. At least one functional unit is included for recording object information. At least one magnet unit is provided for magnetizing the object, the magnet unit including a plurality of magnets. The magnet unit has a plurality of segments each having at least one magnet, and the magnetization directions of segments adjoining one another are angled at least approximately by 90°, preferably by exactly 90°, relative to one another.

An inspection device is provided for inspecting metallic objects extending in planar fashion, in particular sheets or walls. The inspection device is embodied as pipeline-impassable in particular by virtue of dispensing with at least one propulsion element that at least substantially fills an inner pipeline cross section. At least one functional unit is included for recording object information. At least one magnet unit is provided for magnetizing the object, the magnet unit including a plurality of magnets. The magnet unit has a plurality of segments each having at least one magnet, and the magnetization directions of segments adjoining one another are angled at least approximately by 90°, preferably by exactly 90°, relative to one another.

An information processing system is for nondestructive inspection of a measurement target that is a magnetic material covered by a nonmagnetic body. The system includes an information processing device that reduces noise magnetic field components other than magnetic field components coming from the measurement target and/or emphasizes the magnetic field components coming from the measurement target in actual measurement data, based on the actual measurement data and virtual measurement data. The actual measurement data is obtained by applying a magnetic field to the measurement target and actually measuring a magnetic field coming from the measurement target using a magnetic sensor at a measurement position on a surface of the nonmagnetic body. The virtual measurement data is created under virtual conditions that are obtained by modifying actual measurement conditions.

An information processing system is for nondestructive inspection of a measurement target that is a magnetic material covered by a nonmagnetic body. The system includes an information processing device that reduces noise magnetic field components other than magnetic field components coming from the measurement target and/or emphasizes the magnetic field components coming from the measurement target in actual measurement data, based on the actual measurement data and virtual measurement data. The actual measurement data is obtained by applying a magnetic field to the measurement target and actually measuring a magnetic field coming from the measurement target using a magnetic sensor at a measurement position on a surface of the nonmagnetic body. The virtual measurement data is created under virtual conditions that are obtained by modifying actual measurement conditions.

The method for non-destructive flaw detection of aluminium reduction cell anodes is claimed, including the building of a computed model of an anode or the use of a specified model with the known data on the geometry and specific resistance of the anode, the geometry and coordinates of internal defects, wherein several cyclic calculations are carried out; the results of calculations are represented in the form of a 3D-matrix of amplitudes and directions of vectors of calculated intensities or inductions of the electromagnetic field at the discretization points near the outer surface of the anode; at least a pair of electrically conductive contacts that supply the specified amount of electrical current through the anode are placed on the outer surfaces of the inspected anode; at least one sensor is placed near the outer surface of the inspected anode, and the amplitude and direction of the magnetic field intensity or induction vectors are measured and represented as a 3D-matrix of measured magnetic field intensity or induction vectors; the 3D-matrices of calculated and measured magnetic field intensity or induction vectors at the same discretization points near the outer surface of the anode are compared; and, based on results, the sizes and coordinates of internal defects are observed. As a result, the informational value and accuracy of determining the location of defects are increased; the process capabilities of the method are expanded by reducing the instability of transition resistances of the contact area in the stub holes of the anode; the confidence and reliability of flaw detection by measuring the magnetic field intensity vectors with contactless sensors are improved.

The method for non-destructive flaw detection of aluminium reduction cell anodes is claimed, including the building of a computed model of an anode or the use of a specified model with the known data on the geometry and specific resistance of the anode, the geometry and coordinates of internal defects, wherein several cyclic calculations are carried out; the results of calculations are represented in the form of a 3D-matrix of amplitudes and directions of vectors of calculated intensities or inductions of the electromagnetic field at the discretization points near the outer surface of the anode; at least a pair of electrically conductive contacts that supply the specified amount of electrical current through the anode are placed on the outer surfaces of the inspected anode; at least one sensor is placed near the outer surface of the inspected anode, and the amplitude and direction of the magnetic field intensity or induction vectors are measured and represented as a 3D-matrix of measured magnetic field intensity or induction vectors; the 3D-matrices of calculated and measured magnetic field intensity or induction vectors at the same discretization points near the outer surface of the anode are compared; and, based on results, the sizes and coordinates of internal defects are observed. As a result, the informational value and accuracy of determining the location of defects are increased; the process capabilities of the method are expanded by reducing the instability of transition resistances of the contact area in the stub holes of the anode; the confidence and reliability of flaw detection by measuring the magnetic field intensity vectors with contactless sensors are improved.

A technique facilitates tracking and assessing a fatigue life of a tubing string utilizing, for example, estimation of cycles to failure when used in a wellbore operation. The technique may comprise initially determining a fatigue life of a tubing string. Additionally, the technique comprises utilizing a sensing device, e.g. a magnetic flux leakage (MFL) device, to monitor the tubing string. When an anomaly, e.g. a new defect, is detected by the sensing device, a new fatigue life of the tubing string is determined based on the change. The new fatigue life may be used to estimate a fatigue life in terms of cycles to failure.

A technique facilitates tracking and assessing a fatigue life of a tubing string utilizing, for example, estimation of cycles to failure when used in a wellbore operation. The technique may comprise initially determining a fatigue life of a tubing string. Additionally, the technique comprises utilizing a sensing device, e.g. a magnetic flux leakage (MFL) device, to monitor the tubing string. When an anomaly, e.g. a new defect, is detected by the sensing device, a new fatigue life of the tubing string is determined based on the change. The new fatigue life may be used to estimate a fatigue life in terms of cycles to failure.