scholarly journals Very high-cycle fatigue failure in micron-scale polycrystalline silicon films: Effects of environment and surface oxide thickness

2007 ◽  
Vol 101 (1) ◽  
pp. 013515 ◽  
Author(s):  
D. H. Alsem ◽  
R. Timmerman ◽  
B. L. Boyce ◽  
E. A. Stach ◽  
J. Th. M. De Hosson ◽  
...  
Keyword(s):  
Fatigue Failure ◽  
Polycrystalline Silicon ◽  
High Cycle Fatigue ◽  
Oxide Thickness ◽  
Surface Oxide ◽  
Silicon Films ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Polycrystalline Silicon Films ◽  
Very High

Very High Cycle Fatigue Failure of Near β Titanium Alloy

2021 ◽  
Vol 24 (3) ◽  
pp. 326-334
Author(s):  
E. V. Naydenkin ◽  
A. P. Soldatenkov ◽  
I. P. Mishin ◽  
V. A. Oborin ◽  
A. A. Shanyavskiy
Keyword(s):  
Titanium Alloy ◽  
Fatigue Failure ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High

High and very high cycle fatigue failure mechanisms in selective laser melted aluminum alloys

2017 ◽  
Vol 32 (23) ◽  
pp. 4296-4304 ◽  
Author(s):  
Shafaqat Siddique ◽  
Mustafa Awd ◽  
Jochen Tenkamp ◽  
Frank Walther
Keyword(s):  
Aluminum Alloys ◽  
Fatigue Failure ◽  
High Cycle Fatigue ◽  
Failure Mechanisms ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Image Position ◽  
Very High

Abstract

scholarly journals Fractography and Crack Initiation of Very-High-Cycle Fatigue for a High Carbon Low Alloy Steel

2006 ◽  
Vol 324-325 ◽  
pp. 1113-1116 ◽  
Author(s):  
Cheng En Zhou ◽  
Gui An Qian ◽  
You Shi Hong
Keyword(s):  
Fracture Mechanics ◽  
Alloy Steel ◽  
Fatigue Failure ◽  
High Cycle Fatigue ◽  
Fatigue Cracks ◽  
Cycle Fatigue ◽  
Low Alloy Steel ◽  
Crack Origin ◽  
Very High Cycle Fatigue ◽  
Very High

Very-High-Cycle Fatigue (VHCF) is the phenomenon of fatigue damage and failure of metallic materials or structures subjected to 108 cycles of fatigue loading and beyond. This paper attempts to investigate the VHCF behavior and mechanism of a high strength low alloy steel (main composition: C-1% and Cr-1.5%; quenched at 1108K and tempered at 453K). The fractography of fatigue failure was observed by optical microscopy and scanning electron microscopy. The observations reveal that, for the number of cycles to fatigue failure between 106 and 4×108 cycles, fatigue cracks almost initiated in the interior of specimen and originated at non-metallic inclusions. An “optical dark area” (ODA) around initiation site is observed when fatigue initiation from interior. ODA size increases with the decrease of fatigue stress, and becomes more roundness. Fracture mechanics analysis gives the stress intensity factor of ODA, which is nearly equivalent to the corresponding fatigue threshold of the test material. The results indicate that the fatigue life of specimens with crack origin at the interior of specimen is longer than that with crack origin at specimen surface. The experimental results and the fatigue mechanism were further analyzed in terms of fracture mechanics and fracture physics, suggesting that the primary propagation of fatigue crack within the fish-eye local region is the main characteristics of VHCF.

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