scholarly journals Fatigue Strength under Combined Rotating Bending and Torsional Load : Report 4, Fatigue Behavior in V-Notched Circular Specimen of 0.45% Carbon Steel

1975 ◽  
Vol 41 (344) ◽  
pp. 1035-1043
Author(s):  
Saneyasu HOSHI ◽  
Hiroshi NAKAMURA ◽  
Yoshikata KOBAYASHI
Keyword(s):  
Fatigue Strength ◽  
Carbon Steel ◽  
Fatigue Behavior ◽  
Torsional Load ◽  
Rotating Bending ◽  
Circular Specimen

High Cycle Fatigue Behavior of Thermally Oxidized Ti6Al4V Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 2179-2182 ◽  
Author(s):  
Mehmet Cingi ◽  
Onur Meydanoglu ◽  
Hasan Guleryuz ◽  
Murat Baydogan ◽  
Huseyin Cimenoglu ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Yield Strength ◽  
Thermal Oxidation ◽  
Fatigue Behavior ◽  
Surface Hardness ◽  
Ti6al4v Alloy ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Bending Fatigue Strength

In this study, the effect of thermal oxidation on the high cycle rotating bending fatigue behavior of Ti6Al4V alloy was investigated. Oxidation, which was performed at 600°C for 60 h in air, considerably improved the surface hardness and particularly the yield strength of the alloy without scarifying the tensile ductility. Unfortunately, the rotating bending fatigue strength at 5x106 cycles decreased from about 610 MPa to about 400 MPa upon oxidation. Thus, thermal oxidation leaded a reduction in the fatigue strength of around 34%, while improving the surface hardness (HV0.1) and yield strength 85 % and 36 %, respectively.

On the Decrease of Fatigue Limit Due to Small Prestrain

1992 ◽  
Vol 114 (3) ◽  
pp. 317-322 ◽  
Author(s):  
Y. Nagase ◽  
S. Suzuki
Keyword(s):  
Growth Rate ◽  
Carbon Steel ◽  
Fatigue Limit ◽  
Surface Crack ◽  
Fatigue Behavior ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Small Surface ◽  
Bending Tests ◽  
Rotating Bending

Fatigue behavior of plain specimens of low carbon steel subjected to small tensile prestrain is investigated through rotating bending tests and the mechanism of the decrease of fatigue limit due to the prestrain is discussed. It is found that 3 percent prestraining causes the acceleration of both slip and crack initiations, and increases the growth rate of a small surface crack of less than 0.3 mm. It also decreases the fatigue limit. If prestrained material is aged, the fatigue limit increases. These effects of the small prestrain are explained based on the unpinning of locked dislocations due to the prestrain.

Effect of Nanostructured Thermal Spray Coatings on Fatigue Behavior of Low-Carbon Steel

2008 ◽  
Author(s):  
Ahmed Ibrahim ◽  
Christopher C. Berndt
Keyword(s):  
Fatigue Strength ◽  
Carbon Steel ◽  
Surface Deformation ◽  
Fatigue Behavior ◽  
Low Carbon Steel ◽  
Sem Analysis ◽  
Low Carbon ◽  
Air Plasma ◽  
Spray Coatings ◽  
Thermally Sprayed

Nanostructured and conventional titania (TiO2) coatings were thermally sprayed using air plasma spray (APS) and high velocity oxy-fuel (HVOF) processes. The fatigue and mechanical properties of these coatings were investigated. The fatigue strength of coatings deposited onto low-carbon steel showed that the nanostructured titania coated specimens exhibited significantly higher fatigue strength compared to the conventionally sprayed titania. SEM analysis of fracture surfaces revealed valuable information regarding the influence of these coatings on the performance of the coated component. Analysis of surface deformation around Vickers indentations was carried out. This investigation gives new understanding to the nature of fatigue and deformation of these coatings.

Fatigue Strength and Fracture Mechanism of Thermally Sprayed WC-Co Coating on a Medium Carbon Steel by HVOF

1998 ◽  
Author(s):  
T. Tajiri ◽  
N. Sakoda ◽  
S. Watanabe ◽  
J. Amano
Keyword(s):  
Fatigue Strength ◽  
Carbon Steel ◽  
Fracture Mechanism ◽  
Medium Carbon Steel ◽  
Fracture Origin ◽  
Medium Carbon ◽  
Coated Substrate ◽  
Rotating Bending ◽  
Thick Coatings ◽  
Thermally Sprayed

Abstract Fatigue strength and fracture mechanism of a medium carbon steel with HVOF thermally sprayed WC-Co coatings were investigated under rotating bending. Two types of commercially available WC-Co powders were used, which have similar total chemical composition with different manufacturing processes. The fatigue strengths of the specimens with thick coatings were lower than that with thinner ones. Especially, it was found that the fatigue strengths of the thick coating specimens decreased more greatly than that of the grit blasted ones. Also, the morphology of the fatigue crack depended on the type of powders and the thickness of the coating. Futher more, an embedded Al2O3 grit and a crack generated during the grit blasting were found near the fatigue fracture origin of the coated substrate.

708 Rotating bending fatigue behavior of pre-strain 0.45% carbon steel : The pre-strains were given by tension, compression or torsion

2001 ◽  
Vol 2001 (0) ◽  
pp. 247-248
Author(s):  
Yuuichi TOKUNAGA ◽  
Satoshi TANAKA ◽  
Sigeji YAMADA ◽  
Waiaru FUJISAKI ◽  
Takahiro TERANISHI
Keyword(s):  
Carbon Steel ◽  
Fatigue Behavior ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending
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