Electronic-module environmental-stress-screening data-evaluation technique

1999 ◽  
Author(s):  
J.D. Palmer
Keyword(s):  
Environmental Stress ◽  
Data Evaluation ◽  
Evaluation Technique

Hyperbolic Model Based Data Evaluation for Magnetic NDE Measurements

2008 ◽  
Vol 589 ◽  
pp. 251-256
Author(s):  
István Mészáros
Keyword(s):  
Magnetic Measurements ◽  
Data Evaluation ◽  
Magnetic Contribution ◽  
Hyperbolic Model ◽  
Evaluation Technique ◽  
Magnetization Curves ◽  
Model Based ◽  
Non Destructive Evaluation ◽  
Lift Off ◽  
Non Destructive

In this paper a new data evaluation technique is presented for non-destructive magnetic measurements. This method is based on the multiphase hyperbolic model of magnetization and it is called model based data evaluation (MBDE) technique. The MBDE method allows us to separate the magnetic contribution of the magnetizing yoke from the measured magnetization curves. Therefore the determined magnetic properties of the tested sample are independent of the parameters of the applied magnetic yoke and the lift-off. The proposed method could become a useful tool in magnetic non-destructive evaluation (NDE).

Magnetic Detection of Creep Deterioration

2010 ◽  
Vol 659 ◽  
pp. 325-330
Author(s):  
István Mészáros
Keyword(s):  
Ferritic Steel ◽  
Power Plants ◽  
Base Material ◽  
Creep Damage ◽  
Data Evaluation ◽  
Hyperbolic Model ◽  
Evaluation Technique ◽  
Engineering Structures ◽  
Long Time ◽  
Property Changes

In this work a new magnetometer setup and a novel model based data evaluation technique was used to determine the creep damage in ferritic power plant steel. The tested material was 1Cr-0.5Mo-0.25V ferritic steel which is commonly used as pipeline base material of steam generators in power plants. It is commonly accepted that a combined form of fatigue and the creep processes cause the deterioration of this structural parts due to long time elevated temperature service. Nowadays, there is increasing need for remaining lifetime estimation of these engineering structures. In this paper, the variation of magnetization curves of Cr-Mo-V ferritic steel due to creep measured and the relation between creep damage and the magnetic property changes is discussed. A new data evaluation technique is presented which is based on the hyperbolic model of magnetization. A magnetic descriptor was derived from the hyperbolic model which can be determined from the initial part of the normal magnetization curve. The introduced parameter and evaluation technique seems to be especially useful for magnetic nondestuctive remanent lifetime evaluation.

A comparison of the Stroop Test to other tasks for studies of environmental stress.

1981 ◽  
Author(s):  
Mary M. Harbeson ◽  
Robert S. Kennedy ◽  
Alvah C. Bittner
Keyword(s):  
Environmental Stress ◽  
Stroop Test
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