Nondestructive Evaluation Technique for Structural Integrity by Infrared Thermography

2002 ◽  
Vol 2002.1 (0) ◽  
pp. 84-89
Author(s):  
Takahide Sakagami ◽  
Shiro Kubo
Keyword(s):  
Nondestructive Evaluation ◽  
Infrared Thermography ◽  
Structural Integrity ◽  
Evaluation Technique

Effects of contact gap on nondestructive evaluation using magnetic measurement for ferromagnetic steel

2020 ◽  
Vol 64 (1-4) ◽  
pp. 969-975
Author(s):  
Hiroaki Kikuchi ◽  
Yuki Sato
Keyword(s):  
Magnetic Flux ◽  
Nondestructive Evaluation ◽  
Effective Permeability ◽  
Magnetic Circuit ◽  
Magnetic Measurement ◽  
Air Gap ◽  
Motive Force ◽  
Hysteresis Curve ◽  
Evaluation Technique ◽  
Ferromagnetic Steel

We investigated effects of contact gap on magnetic nondestructive evaluation technique using a magnetic single-yoke probe. Firstly, we evaluated hysteresis curves and impedance related to permeability of the material measured by a single-yoke probe, when an air gap length between the probe and specimens changes. The hysteresis curve gradually inclines to the axis of the magneto-motive force and magneto-motive force at which the magnetic flux is 0 decreases with increasing the gap length. The effective permeability also decreases with increasing the gap thickness. The incremental of gap thickness increases the reluctance inside the magnetic circuit composed of the yoke, specimen and gap, which results in the reduction of flux applying to specimen.

Web Based Nondestructive Evaluation Using Acoustic Emission

2009 ◽  
Author(s):  
Samuel J. Ternowchek ◽  
Ronnie K. Miller ◽  
Phillip T. Cole
Keyword(s):  
Nondestructive Evaluation ◽  
Structural Integrity ◽  
Cost Effective ◽  
Operating Conditions ◽  
Web Based ◽  
Continuous Basis ◽  
The Right ◽  
Real Time Information ◽  
Time Information ◽  
Fixed Period

As operating equipment and structures age, the probability of failure increases. Increasing inspection cycles (over some fixed period of time) with conventional nondestructive evaluation (NDE) is one way to address this problem but it comes at a cost. In addition, an uncertainty exists that the right area(s) have been inspected during one of these inspection cycles. As a result, there is a need for a technique and method that provides the user with real time information about structural integrity or operating conditions. This technique and method must be cost effective and minimize the need for a person to be near the structure operating equipment in order to obtain data on a continuous basis.

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