scholarly journals Influence of magnetizing current speed in magnetic adaptive testing

2018 ◽  
Vol 69 (6) ◽  
pp. 461-463
Author(s):  
Gábor Vértesy ◽  
Ivan Tomáš
Keyword(s):  
Adaptive Testing ◽  
Optimal Choice ◽  
Current Speed ◽  
Low Speed ◽  
Magnetizing Current ◽  
Magnetic Adaptive Testing ◽  
Changing Rate

Abstract Influence of changing rate of magnetizing current in magnetic adaptive testing was studied. Sensitivity of magnetic descriptors, which characterize the samples degradation, was found to depend on this speed. Low speed results in a better sensitivity, but the effect depends on permeability of the investigated specimens. Recommendation was made for the optimal choice of the applied speed of the magnetizing current.

Measurement of Flat Samples With Rough Surfaces by Magnetic Adaptive Testing

2012 ◽  
Vol 48 (4) ◽  
pp. 1441-1444 ◽  
Author(s):  
Ivan Tomas ◽  
Jana Kadlecova ◽  
Gábor Vertesy
Keyword(s):  
Rough Surfaces ◽  
Adaptive Testing ◽  
Magnetic Adaptive Testing

Investigation of Cast Iron Matrix Constituents by Magnetic Adaptive Testing

2019 ◽  
Vol 55 (3) ◽  
pp. 1-6 ◽  
Author(s):  
G. Vertesy ◽  
I. Tomas ◽  
B. Skrbek ◽  
T. Uchimoto ◽  
T. Takagi
Keyword(s):  
Cast Iron ◽  
Adaptive Testing ◽  
Iron Matrix ◽  
Magnetic Adaptive Testing

scholarly journals Inspection of Reactor Steel Degradation by Magnetic Adaptive Testing

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 963
Author(s):  
Gábor Vértesy ◽  
Antal Gasparics ◽  
Ildikó Szenthe ◽  
Ferenc Gillemot ◽  
Inge Uytdenhouwen
Keyword(s):  
Structural Changes ◽  
Magnetic Measurements ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Charpy Impact ◽  
Adaptive Testing ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Type Definition ◽  
Magnetic Adaptive Testing

Degradation of nuclear pressure vessel steel materials, 15Kh2NMFA type and A508 Cl2 type (definition is given in the text) were investigated by a novel magnetic nondestructive testing method, so-called Magnetic Adaptive Testing (MAT), which is based on systematic measurement and evaluation of minor magnetic hysteresis loops. The measured samples were thermally treated by a special step cooling procedure, which generated structural changes in the material. It was found that this type of degradation can be easily followed by magnetic measurements. Charpy impact test were also performed and the results were compared with the magnetic parameters. In case of 15Kh2NMFA steel, a good, reliable and closely linear correlation was found between magnetic descriptors and transition temperature.

scholarly journals Adaptive Testing for Nondestructive Evaluation of Degraded Materials

2016 ◽  
Vol 67 (4) ◽  
pp. 273-278 ◽  
Author(s):  
Ivan Tomáš ◽  
Gábor Vértesy
Keyword(s):  
Nondestructive Evaluation ◽  
Physical Process ◽  
Experimental Evaluation ◽  
Adaptive Testing ◽  
Material Degradation ◽  
Magnetic Adaptive Testing ◽  
Special Case

Abstract Method of Adaptive testing (AT) is described, as a way of optimization of experimental evaluation of degraded materials, which are measured nondestructively, indirectly via a convenient physical process. The general AT is illustrated by a well-explored special case of magnetic adaptive testing (MAT) of strained steel. Degradation curves obtained from AT are regularly more sensitive and experimentally friendly than traditional descriptors of the used physical process itself. Any of the traditional descriptors of the physical process, being optimized for description of the process itself, is very probably not optimized for description of the investigated material degradation.

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