The study on delamination life of TBC through burner-rig test

2017 ◽  
Vol 18 (4) ◽  
pp. 555-560
Author(s):  
Junghan Yun ◽  
Yongseok Kim ◽  
Jeong-Min Lee ◽  
Hyunwoo Song ◽  
Sunguk Wee ◽  
...  
Keyword(s):  
Delamination Life

Problems Associated with the Use of Skirts on Hovercraft

1967 ◽  
Vol 182 (1) ◽  
pp. 201-218
Author(s):  
W. A. Crago
Keyword(s):  
Three Dimensional ◽  
Model Tests ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Operational Conditions ◽  
The Third ◽  
Rough Water ◽  
Delamination Life ◽  
First Time

The lecture commences with a brief description of early hovercraft work and shows how the advent of flexible extensions to the peripheral jets—or ‘skirts’—constituted a breakthrough without which the hovercraft would never have become a practical proposition with the ability to operate over waves and rough ground. It is shown that the introduction of skirts, whilst providing a solution in one respect, also led to a series of problems and three of these are singled out for further discussion. First it is shown that whilst a relatively high internal skirt pressure is desirable to maintain skirt shape under operational conditions, this pressure can also lead to a high rough water drag. The second problem is that of ‘plough in’ and overturning, which is intimately associated with the use of skins. The hydrodynamic mechanisms of both these undesirable phenomena are for the first time explained in detail and are illustrated by means of data obtained from two- and three-dimensional model tests. The third problem raised by the introduction of skirts is skirt oscillation and wear. The techniques necessary to investigate delamination are described and some of the factors which have been shown to be important in increasing delamination life are outlined.

Observation of Heat Cycle Delamination Process with Surface Strain Measurement in Thermal Barrier Coating

2004 ◽  
Vol 261-263 ◽  
pp. 453-458
Author(s):  
Hiroyuki Waki ◽  
Izuru Nishikawa ◽  
K. Ogura
Keyword(s):  
Thermal Expansion ◽  
Strain Measurement ◽  
Laser Speckle ◽  
Surface Strain ◽  
Thermal Barrier ◽  
Heat Cycle ◽  
Bond Coating ◽  
Strain Behavior ◽  
Delamination Life ◽  
Plasma Sprayed

A surface strain measurement approach to understanding of delamination processes of thermal barrier coatings (TBCs) under heat cycle conditions was described in this paper. Heat cycle tests between the high temperature ranged from 1473K to 1073K and the relatively low temperature (573K) was carried out on thermal barrier coated type 304 stainless steel specimens. 8mass%Y2O3- ZrO2 and Al2O3 coatings were used for the TBCs. The surface strain behavior during the heat cycle test was measured using a laser speckle strain/displacement gauge (SSDG). It was found that the thermal expansion of a substrate was almost reflected on a surface strain if a delamination wasn't initiated, while the value of a surface strain decreased to the value of the thermal expansion of a ceramics-coating if the delamination of the ceramics-coating was initiated. The state of a subsurface delamination was able to be nondestructively inferred by the surface strain behavior. The delamination life of a ceramics-coating in the specimen with a low-pressure-plasma-sprayed (LPPS) bond-coating was found to be longer than that with an atmospheric-plasma-sprayed (APS) bond-coating. The large roughness of a bond-coating was also found to be effective in improving the delamination life of a ceramics-coating owing to the restriction of a crack propagation parallel to the interface between the ceramics-coating and the bond-coating.

Proposal of Delamination Life Evaluation of Thermal Barrier Coating

2000 ◽  
Vol 2000 (0) ◽  
pp. 353-354
Author(s):  
Masayuki ARAI ◽  
Toshio SAKUMA ◽  
Uichi IWATA ◽  
Masahiro SAITOH
Keyword(s):  
Thermal Barrier Coating ◽  
Thermal Barrier ◽  
Life Evaluation ◽  
Barrier Coating ◽  
Delamination Life
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