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Metal Magnetic Memory

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Metal Magnetic Memory

Mar 31, 2020 Metal magnetic memory is an aftereffect, which becomes apparent in the form of residual magnetization of products and welded joints metal formed in the course of their fabrication and cooling in a weak magnetic field or in the form of irreversible changing of products magnetization in stress concentration and damaging zones due to working loads.

ASNT NDT Library

The objective of this research is to develop a quantitative algorithm between the magnetic parameter bm and the stress concentration factor in ferromagnetic steels.

The Metal Magnetic Memory (MMM) Method and the scope of scientific research, that are conducted in polish scientific centers in order to confirm and extend its operational possibilities to diagnose early stages of progressive material degradation, have also been presented. Taking the MMM Method into account, IT support of non-destructive ...

Based on the magneto-mechanical effect, the influence of crack size on stress evaluated with metal magnetic memory (MMM) technology was discussed in this paper. Based on equivalent theory, the regular rectangular grooves, with different widths and depths, were precut in the surface of an experimental sample for simulating surface crack, and a three dimensional electrically controlled ...

Materials | Free Full-Text | Influence of Crack Size on

Materials | Free Full-Text | Influence of Crack Size on

Based on the metal magnetic memory effect, this paper proposed a new non-destructive testing method for the internal tensile force detection of steel bars by analyzing the self-magnetic flux leakage (SMFL) signals. The variation of the SMFL signal of the steel bar with the tensile force indicates th …

Non-destructive testing - Metal magnetic memory Part 1: Vocabulary

The Magnetic Memory Method is a set of video courses created by Anthony Metivier. It teaches the fundamentals of memory palaces and mnemonic devices for memorizing different types of information. In fact, Anthony has even written an introductory article about memory palaces for Fi3M. There are several courses available as a part of the Magnetic ...

Jun 23, 2014 Metal magnetic memory (MMM) technique is an effective method to achieve the detection of stress concentration (SC) zone for oil well casing. It can provide an early diagnosis of microdamages for preventive protection. MMM is a natural space domain signal which is weak and vulnerable to noise interference. So, it is difficult to achieve effective feature extraction of MMM signal …

Fatigue damage evaluation of used parts based on metal magnetic memory testing: CHEN Shangong 1,2,4, ZONG Xuemei 1,2, HUANG Haihong 3, WANG Guangcun 1,2, HE Bing 1,2: 1. Jiangsu XCMG Construction Machinery Research Institute Co., Ltd., Xuzhou 221004, China;

Fatigue damage evaluation of used parts based on metal

Fatigue damage evaluation of used parts based on metal

Characteristics of metal magnetic memory signals of

Apr 24, 2012 The detection of crack initiation in steel Q235, 16MnR and 20 g was carried out by metal magnetic memory (MMM) technique. Fifty specimens of welded and base metal were tested. Both MMM testing and metallographic examination were done to them when unloaded at the different phase of high‐cycle fatigue testing, and hence MMM signals before and ...

The metal magnetic memory (MMM) method is a kind of non-destructive testing technology which can monitor stress concentration and early damage of a drillstring to effectively further prevent the occurrence of fracture accidents [8–11]. Different from the traditional non-destructive testing

Portable Metal Magnetic Memory Tester The COBE metal magnetic memory tester is mainly used to detect the most dangerous parts and workpieces in the stress concentration zone of heavy industrial equipment.; Multichannel Metal Magnetic Memory Testing Instrument The multichannel metal magnetic memory testing instrument is a multifunctional inspection unit integrating digital, magnetic memory…

Non-contact Metal Magnetic Memory (MMM) Method can satisfy our need by detecting the abnormal magnetic signals in the stress concentration zone and is a new way for long-distance oil and gas pipeline detection. In this paper, the features of MMM detection for buried pipelines were summarized, some sections of pipelines in service were detected ...

Metal magnetic memory(MMM) technology, a new developing NDT technique, can find not only macroscopic defects, but also stress concentration zones and early damage[4]. Based on the magneto-mechanical effect, the MMM magnetic field is related to the mechanical stress, that is, the magnetic field

Quantitative Metal Magnetic Memory Reliability …

Quantitative Metal Magnetic Memory Reliability …

The Metal magnetic memory (MMM) technique is marketed as a non-destructive testing method to evaluate stress concentration for ferromagnetic materials by measuring variations of the self-magnetic leakage field (SMLF) distribution on the specimen surface. This method has been implemented as a periodic screening inspection tool by several companies, and has been reported to be capable of ...

Metal magnetic memory (MMM) method is a novel, passive magnetic method for inspecting mechanical degradation of ferromagnetic components. In this paper, the correlation between plastic deformation and the deformation-induced magnetic field was experimentally investigated for the X80 steel. Various tensile plastic deformations are introduced into test pieces with different initial discontinuities.

Metal. magnetic memory (MMM) is a relatively novel method introduced by Anatoly A. Dubov [1-3], that proved its effectiveness in detecting the mi cro-damage in ferromagne ts due to the str ess ...

SANS 24497-1:2010 (Ed. 1.00)

Non-destructive testing - Metal magnetic memory Part 1: Vocabulary

program for data processing by the metal magnetic memory method. call. Availability: Software MMM-Lifetime version 2.0. MMM-Lifetime is a specialized program to assess residual lifetime of equipment metal by fatigue damaging in stress concentration zones (SCZs) based on the diagnostic data using the metal magnetic memory method (the MMM method)

Software for Metal Magnetic Memory Method

Software for Metal Magnetic Memory Method

3.2. Active stress measurement using metal magnetic memory (MMM) The dependence of the magnetic properties of the sample on the applied stress is illustrated by the phenomena of the magneto-mechanical effect, which can be described by two equations [11, 21]: dM dσ = 1 ε2 σ(1 −c)(M an −M irr)+ dM an dσ (1) where c and ε are constants ...

Metal Magnetic Memory (MMM) Technology Fast screening method to determine the condition of ferrous and para-magnetic alloys by analyzing metal magnetic memory after-effect due to damage mechanism acting on the object.

Metal magnetic memory testing of welding joint: GE Hao 1,2: 1. Zhejiang Academy of Special Equipment Science, Hangzhou 310000, China; 2. Key Laboratory of Special Equipment Safety Testing Technology of Zhejiang Province, Hangzhou 310000, China

Results of diagnostics by the metal magnetic memory method were presented by a magnetogram of the magnetic field strength and field gradient on the measured distance. The changes in the magnetic field strength proved different stress concentration zones due to the reinforcing bar condition.

Mar 16, 2012 A new nondestructive monitoring method is considered, i.e., a metal magnetic memory method, based on measuring the self-magnetization leakage field (SMLF) at the surface of test equipment. The method makes it possible to obtain the stressed state without considering structural changes. The magnetic memory effect is applied to the working areas of applied maximum loads during testing. The metal ...

Development of a metal magnetic memory method | …

Development of a metal magnetic memory method | …

Principal features of method of metal magnetic memory (MMM) as compared to known magnetic NDT methods are considered. Among the basic features of the MMM method, that it is based on use of the own magnetic leakage field (SMLF), arising in ferromagnetic and paramagnetic products on accumulations of high-density dislocations. Magnetodislocation hysteresis underlying effect of metal magnetic ...

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