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.

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 Establishment of an NDE Center at the Papua New Guinea University of Technology: Scope and Objectives

1997 ◽  
Author(s):  
Don E. Bray ◽  
G. S. Gad
Keyword(s):  
Nondestructive Evaluation ◽  
Papua New Guinea ◽  
Pacific Islands ◽  
Solomon Islands ◽  
Flaw Detection ◽  
Cost Effective ◽  
New Guinea ◽  
Material Degradation ◽  
University Of Technology ◽  
South Pacific Islands

Papua New Guinea lies just north of Australia (Fig. 1). It is a developing island nation, with 462,839 km of land area, a population of 3.9 million people, and vast natural resources (Compton’s Interactive Encyclopedia, 1996). It is the largest island in the Oceania region of the world, which also includes Fiji, the Solomon Islands and Vanuatu. Most of these islands share similar resources, and prudent development of the resources requires utilization of nondestructive evaluation (NDE). NDE provides the means for flaw detection and size assessment, as well as evaluation of material degradation such as corrosion and hydrogen attack. These are factors which affect the service life of components and systems. Being aware of the state of degradation of these components and systems will enable cost effective maintenance, and reduce costly and dangerous failures. Recognizing the need for NDE expertise, the Papua New Guinea University of Technology at Lae has initiated a Center for Nondestructive Evaluation. Once operational, the center should serve the entire Oceania region, and provide resources, trained students and expertise that will enable the growth of the NDE industry within that area. It is widely accepted that NDE adds value to a product or process, not just cost. The amount of value is directly related to the engineering education of the personnel making NDE decisions. The growth of the NDE industry in these South Pacific Islands will add to the economy, as well as aid in the further creation of a population of engineers who are well educated in NDE.

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.

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