scholarly journals Control of fatigue failure mechanisms in multilayer coatings by varying the architectural parameters of an intermetallic interlayer

2022 ◽  
Author(s):  
Songsong Lu ◽  
Richard Cook ◽  
Yi Zhang ◽  
Philippa Reed
Keyword(s):  
Fatigue Failure ◽  
Failure Mechanisms ◽  
Multilayer Coatings

Optimization of the cutting edge radius of PVD coated inserts in milling considering film fatigue failure mechanisms

2000 ◽  
Vol 133-134 ◽  
pp. 501-507 ◽  
Author(s):  
K.-D Bouzakis ◽  
N Michailidis ◽  
N Vidakis ◽  
K Efstathiou ◽  
T Leyendecker ◽  
...  
Keyword(s):  
Fatigue Failure ◽  
Failure Mechanisms ◽  
Cutting Edge ◽  
Cutting Edge Radius ◽  
Edge Radius

scholarly journals Control of fatigue failure mechanisms in multilayer coatings by varying the architectural parameters of an intermetallic interlayer

2021 ◽  
Author(s):  
Songsong Lu ◽  
Richard Cook ◽  
Yi Zhang ◽  
Philippa Reed
Keyword(s):  
Crack Initiation ◽  
Surface Crack ◽  
Intermetallic Layer ◽  
Failure Mechanisms ◽  
Multilayer Coatings ◽  
Coating System ◽  
Fatigue Improvement ◽  
Initiation Mechanism ◽  
Experimental Characterisation ◽  
Surface Crack Initiation

A multilayer overlay coating system containing an intermediate intermetallic layer (designated 2IML) is an architecture expected to show good fatigue resistance. Experimental characterisation and modelling simulations were carried out to classify the different crack initiation mechanisms occurring during fatigue of this coating system and to reveal how changes in the layer architecture lead to fatigue improvement. Fatigue improvement is achieved by decreasing the IML-Top layer thickness due to the increased surface crack initiation resistance. However subsurface initiation mechanisms inhibit the improvement (dominated by surface initiation mechanism) achieved by locating the IML-Top layer closer to the top surface.

scholarly journals The Impact of Lubricant Film Thickness and Ball Bearings Failures

Lubricants ◽  
2019 ◽  
Vol 7 (6) ◽  
pp. 48 ◽  
Author(s):  
Matthew David Marko
Keyword(s):  
Film Thickness ◽  
Fatigue Failure ◽  
Failure Mechanisms ◽  
Roller Bearing ◽  
Lubricant Film ◽  
Theoretical Formula ◽  
Empirical Equations ◽  
Ball Bearings ◽  
Lubricant Film Thickness ◽  
The Impact

An effort was made to find a relationship between the lubricant thickness at the point of contact of rolling element ball bearings, and empirical equations to predict the life for bearings under constant motion. Two independent failure mechanisms were considered, fatigue failure and lubricant failure resulting in seizing of the roller bearing. A theoretical formula for both methods was established for the combined probability of failure using both failure mechanisms. Fatigue failure was modeled with the empirical equations of Lundberg and Palmgren and standardized in DIN/ISO281. The seizure failure, which this effort sought to investigate, was predicted using Greenwood and Williamson’s theories on surface roughness and asperities during lubricated contact. These two mechanisms were combined, and compared to predicted cycle lives of commercial roller bearing, and a clear correlation was demonstrated. This effort demonstrated that the Greenwood–Williams theories on the relative height of asperities versus lubricant film thickness can be used to predict the probability of a lubricant failure resulting in a roller bearing seizing during use.

Fatigue failure mechanisms of single-walled carbon nanotube ropes embedded in epoxy

2004 ◽  
Vol 84 (15) ◽  
pp. 2811-2813 ◽  
Author(s):  
Y. Ren ◽  
Y. Q. Fu ◽  
K. Liao ◽  
F. Li ◽  
H. M. Cheng
Keyword(s):  
Carbon Nanotube ◽  
Fatigue Failure ◽  
Failure Mechanisms ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon
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