NONDESTRUCTIVE EVALUATION OF DUAL MICROSTRUCTURE TURBINE ENGINE DISK MATERIAL

2011 ◽  
Author(s):  
E. A. Medina ◽  
M. P. Blodgett ◽  
R. W. Martin ◽  
S. Sathish ◽  
Donald O. Thompson ◽  
...  
Keyword(s):  
Nondestructive Evaluation ◽  
Turbine Engine ◽  
Disk Material

Automatic Risk Assessment Methodology for Gas Turbine Engines Employing Adaptive Recursive Triangulation

2007 ◽  
Author(s):  
Jonathan P. Moody ◽  
Harry R. Millwater ◽  
Michael P. Enright
Keyword(s):  
Risk Assessment ◽  
Gas Turbine ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Disk Model ◽  
Turbine Engine ◽  
Disk Material ◽  
Metallurgical Defects ◽  
Rotor Disk ◽  
Time Required

A new automatic methodology for the risk assessment of gas turbine engine rotor disks subject to metallurgical defects is being investigated. This method has the promise of significantly reducing the amount of human time required to discretize the disk material into zones and to manually refine the zones to ensure convergence. The method is based on the concept of adaptive recursive triangulation which requires only limited initial defect locations from the analyst. Regions of refinement are selected based upon several criteria and various subdivision schemes are investigated. A numerical example using a rotor disk model is presented.

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.

A Framework for Computational Nondestructive Evaluation of Degraded Composites with Microscale Discontinuities

2020 ◽  
Vol 78 (1) ◽  
pp. 104-118
Author(s):  
Sajan Shrestha ◽  
◽  
Vahid Tavaf ◽  
Sourav Banerjee
Keyword(s):  
Nondestructive Evaluation
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