Study on stress testing of ferromagnetic materials based on magnetic anisotropy

2022 ◽  
Vol 64 (1) ◽  
pp. 45-49
Author(s):  
Ruilei Zhang ◽  
Ziyang Gong ◽  
Zhongchao Qiu ◽  
Yuntian Teng ◽  
Zhe Wang
Keyword(s):  
Magnetic Anisotropy ◽  
Stress Testing ◽  
Processing System ◽  
Ferromagnetic Materials ◽  
Testing System ◽  
Destructive Testing ◽  
Signal Processing System ◽  
System A ◽  
Zn Ferrite ◽  
Testing Experiment

The stress testing and evaluation of ferromagnetic materials that are widely applied in engineering has always been a focus of, and presented difficulties for, non-destructive testing. As there is still no effective method for detecting the stress of ferromagnetic materials, this paper puts forward the idea of applying the magnetic anisotropy method based on the inverse magnetostriction effect in stress testing of ferromagnetic materials. According to the principle of the magnetic anisotropy method, this paper discusses the development of Mn-Zn ferrite probes of three different structures, the construction of a magnetic anisotropy testing system comprising an excitation system, a signal collecting system and a signal processing system and the way in which a testing experiment was conducted on a 16MnR steel plate specimen under different conditions of stress, frequency and excitation voltage. All three types of probe can effectively determine the stress location of the specimen and present different phenomena and characteristics of the test. According to the experiment, significant correlation is seen between the stress and the magnetic signal, which provides a new idea for stress testing of ferromagnetic materials.

scholarly journals Nondestructive Detection of Ceramic Products Based on Tapping Sound Signal Feature Recogition

2021 ◽  
Vol 2132 (1) ◽  
pp. 012026
Author(s):  
Liping Liu ◽  
Liucheng Jiang ◽  
Lele Qiao
Keyword(s):  
Signal Processing ◽  
Processing System ◽  
Sound Signal ◽  
Sample Length ◽  
Destructive Testing ◽  
Signal Processing System ◽  
Processing Module ◽  
Linear Poly ◽  
Low Efficiency ◽  
Non Destructive

Abstract Recent studies on the test of ceramic non-destructive testing are mainly based on high cost technologies, image processing and so on, these method possesses some drawback of low efficiency, high cost and so on. What’s more, detecting whether the ceramic products by human through listening to sound of tapping is also effectless. This paper proposed a non-destructive method for ceramic products to solve this problem. This non-destructive method consists of a tapping device and a signal processing module. The tapping device will be applied to generate the tapping sound signal and the signal processing system will be applied to analysis signal. After the process of signal analysis, sample length and peak of spectrum 2 parameters is extracted, then use these parameters to train SVM, the results will be compared with BP neural network (BPNN). The result of experiment shows that SVM with different kernels of linear, poly, rbf, sigmoid respectively reach the accuracy of 96.29%, 96.29%, 46.29%, 93.82%, while BPNN reaches the accuracy of 93.21%. This result proves that SVM can effectively complete the task of identifying defective ceramics, and its performance is better than BPNN.

One Domain Wall Hysteresis Model for Spherical Grain

2012 ◽  
Vol 727-728 ◽  
pp. 140-145 ◽  
Author(s):  
Marcos Flavio de Campos ◽  
José Adilson de Castro
Keyword(s):  
Grain Size ◽  
Domain Wall ◽  
Coercive Force ◽  
Magnetic Anisotropy ◽  
Magnetic Materials ◽  
Legendre Polynomials ◽  
Ferromagnetic Materials ◽  
Hysteresis Model ◽  
Uniaxial Magnetic Anisotropy ◽  
System A

The high uniaxial magnetic anisotropy makes phases like Nd2Fe14B, Sm2Co17, SmCo5or BaFe12O19are very suitable as hard permanent magnetic materials. In the case of ferromagnetic materials, the global magnetostatic energy changes, according to the domain wall configuration. The simplest case to be studied is that of spherical grain with only one domain wall, in phases with uniaxial symmetry. The magnetostic energy in this system is calculated by means of Legendre polynomials. Studying the maximums and minimums of energy in this system, a simple hysteresis model can be developed. The model provides insight about the dependence of the coercive force on the grain size.

scholarly journals An Integrated Portable Multiplex Microchip Device for Fingerprinting Chemical Warfare Agents

Micromachines ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 617 ◽  
Author(s):  
Karolina Petkovic ◽  
Anthony Swallow ◽  
Robert Stewart ◽  
Yuan Gao ◽  
Sheng Li ◽  
...  
Keyword(s):  
Degradation Products ◽  
Processing System ◽  
Chemical Warfare Agents ◽  
Chemical Warfare ◽  
Biological Agents ◽  
Graphic User Interface ◽  
Signal Processing System ◽  
System A ◽  
Warfare Agents ◽  
On Chip

The rapid and reliable detection of chemical and biological agents in the field is important for many applications such as national security, environmental monitoring, infectious diseases screening, and so on. Current commercially available devices may suffer from low field deployability, specificity, and reproducibility, as well as a high false alarm rate. This paper reports the development of a portable lab-on-a-chip device that could address these issues. The device integrates a polymer multiplexed microchip system, a contactless conductivity detector, a data acquisition and signal processing system, and a graphic/user interface. The samples are pre-treated by an on-chip capillary electrophoresis system. The separated analytes are detected by conductivity-based microsensors. Extensive studies are carried out to achieve satisfactory reproducibility of the microchip system. Chemical warfare agents soman (GD), sarin (GB), O-ethyl S-[2-diisoproylaminoethyl] methylphsophonothioate (VX), and their degradation products have been tested on the device. It was demonstrated that the device can fingerprint the tested chemical warfare agents. In addition, the detection of ricin and metal ions in water samples was demonstrated. Such a device could be used for the rapid and sensitive on-site detection of both chemical and biological agents in the future.

scholarly journals An Improved Transmissive Method of Stress Nondestructive Measurement Based on Inverse Magnetostrictive Theory for the Ferromagnetic Material

2021 ◽  
Vol 7 (7) ◽  
pp. 106
Author(s):  
Jiewei Zeng ◽  
Yunsong Xu ◽  
Shi Liang ◽  
Zhiqiang Long
Keyword(s):  
Internal Stress ◽  
Electromagnetic Interference ◽  
Processing System ◽  
Ferromagnetic Material ◽  
Test System ◽  
Ferromagnetic Materials ◽  
Internal Stresses ◽  
Nondestructive Measurement ◽  
Signal Processing System ◽  
Technical Requirements

In order to meet the technical requirements of non-destructive measurement for the internal stress of ferromagnetic materials represented by cold-rolled steel sheets during the rolling control process, the paper presents a novel method for the nondestructive measurement of ferromagnetic materials based on inverse magnetostrictive principle. By improving the traditional U-shaped sensor, a transmissive quadrapole layout is proposed. The corresponding excitation module and fast signal processing system for dynamic measurement were developed and the test system for detecting innerstress of ferromagnetic material was constructed in the laboratory. The relationship between the magnetic flux with the principal stress was found by experimental investigation and the sensitive correlation of the two was verified under the laboratory measurement conditions without strong electromagnetic interference. The influence of measurement results by sensor parameters such as sensor angle, amplitude of excitation current, variation of air gap were discussed in detail and a method was proposed to decrease the power supply instability caused by the change of the airgap. The experimental results show that the transmission quadrupole layout makes the test system exhibit a good linear response to the internal stress in the specimen. The feasibility of the magnetic detection method of internal stresses in ferromagnetic material was verified through the experiment.

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