Optical nondestructive evaluation technique capable of predicting failure

1999 ◽  
Author(s):  
Sanichiro J. Yoshida ◽  
M. H. Pardede ◽  
B. Siahaan ◽  
I. Muhamad ◽  
N. Sijabat ◽  
...  
Keyword(s):  
Nondestructive Evaluation ◽  
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.

Evaluation of Phase Transformation in Manganese Steels by Eddy Current Method

2010 ◽  
Vol 442 ◽  
pp. 316-321
Author(s):  
S.H. Khan ◽  
Aamer Nusair Khan ◽  
K. Mahmood
Keyword(s):  
Nondestructive Evaluation ◽  
Eddy Current ◽  
Current Method ◽  
Evaluation Technique ◽  
Eddy Current Method ◽  
Compression Load ◽  
Current Testing ◽  
Different Types ◽  
Manganese Steels

An investigation was conducted to explore the applicability of eddy current nondestructive evaluation technique for the characterization of manganese steels. Specimens of two different types of manganese steels were subjected to various compression loads. The specimens were then evaluated by mechanical and eddy current testing. The hardness and eddy current values were increased due to conversion of austenite to martensite. In this study the correlation between eddy current parameters and compression load was discussed.

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