Papers by Keyword: Barkhausen Noise

Abstract: Hot-stamped high strength steel (HSS) is widely used in body structure as a solution for weight-reduction of automobiles. In order to realize fast field measurement of mechanical properties of hot-stamped HSS parts, a magnetic Barkhausen noise (MBN) test system was developed. The system was used to measure hardness of hot-stamped bumper beam and strip with tailored properties. Results show good precision and convenience of the MBN method.

Abstract: Shot-Peening is used to generate surface-near compressive residual stresses in final shape parts, usually to improve their fatigue properties. The success of the process can be checked in different ways. XRD and Hole-Drilling determine quantitative stress depth profiles in specific locations. Barkhausen noise measurements evaluate a near-surface zone in real-time and can cover large areas quickly. It is a fully nondestructive method. This study compares ESPI Hole-Drilling, which is a very fast technique, and XRD, which is very precise but slower, to Barkhausen Noise results for the case of three steel rings shot-peened with different intensities.

Abstract: Magnetic Barkhausen noise (MBN) is a new technique on non-destructive testing of residual stress. The testing system based on virtual instrument was explored. It can achieve the MBN and deal with it in time. The technique is applied to analyze residual stress in the welding line of iron materials back and forth the heat treatment. Through comparing with the data of blind-hole method, the corresponding change between Barkhausen signals and residual stress is verified.

Abstract: Non-destructive testing methods, such as Magnetic Barkhausen Noise method, are widely used on railways for examining the stress state of running railway rails. Detailed information about the morphology of the microstructure features of the rail surface is derived by Scanning Electron Microscopy. Phase composition, hardness and residual stress state of the rails are determined by MBN signal.

Abstract: The design and development of a low cost, portable magnetic Barkhausen Noise Sensor is presented. The health of ferromagnetic objects can be monitored by analyzing MBN response. Comparative estimations of the location and size of any microstructural defects or previously applied tensions can be obtained. Each stage of the sensor is presented along with explanatory circuit diagrams, and descriptions of the magnetization and the receiving coil are given. The device can perform accurate, non-destructive measurements of steel magnetic properties, and has an advantage over currently available commercial sensors in terms of both cost and size.

Abstract: This paper deals with detection of surface damage after grinding of bearing rings made of case hardened steel. Micromagnetic technique based on Barkhausen noise is adopted for monitoring of surface integrity during grinding rings of large diameter (1500 mm). Except micromagnetic testing, investigation of surface integrity is also expressed in such parameters as structure alterations, residual stresses measured via X - ray technique and microhardness measurement. It was found that Barkhausen noise technique enables reliable detection of surface integrity and damage induced by dry grinding and insufficient coolant supply can be easily distinguished.

Abstract: In order to realize the nondestructive testing for hot forming high strength steel parts, a hardness testing device based on Magnetic Barkhausen Noise (MBN) was developed. By measuring MBN of standardized blocks of Rockwell hardness and extracting feature values of the noise, a fitted curve between hardness and MBN peak was calibrated. Good linearity was found between hardness and MBN peak within high hardness range 35~60HRC. The testing device was proved to be high-precision and stable by measuring the practical high strength steel parts.

Abstract: A nonlinear empirical model between stress and Barkhausen noise is identified in this study. The identification procedure uses a genetic algorithm followed by a Nelder-Mead optimization procedure. The model is identified with the data set where an external load is applied to RAEX400 low alloyed hot-rolled steel samples. The results of the study show that the identified model performs well in stress predictions. The identified model includes three terms which are in accordance with the literature.

Abstract: This article deals with influence of the milling cutter tool’s geometry on tension in surface layer of workpiece. It describes, whether the tool brings the residual stress into the surface and its measurement by the magnetoelastic method based on the Barkhausen noise principle. The correct choice of the tool and cutting parameters has significant influence on surface layer of the component and extends so its lifetime and dependability. In this way we try to comply with permanent growing on the machine component.

Abstract: The purpose of this paper is to present the results of observation of material degradation process in steel samples under combined conditions of static and cyclic dynamic loading, using selected electromagnetic NDT methods. To evaluate damages a Barkhausen noise observation, an AC magnetization, a magnetic flux leakage and eddy current method were used.