Observation of Cracks Originating from Transition Area in Induction-Heated S45C Shaft under Rotating Bending Fatigue

2020 ◽  
Vol 832 ◽  
pp. 3-9
Author(s):  
Koshiro Mizobe ◽  
Masayuki Matsushita ◽  
Takuya Shibukawa ◽  
Katsuyuki Kida
Keyword(s):  
Induction Heating ◽  
Low Cost ◽  
Large Diameter ◽  
Low Carbon Steel ◽  
Fatigue Tests ◽  
Low Carbon ◽  
Bending Fatigue ◽  
Transition Area ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

Low carbon steel is one of the most common steels used in industry because of its low cost. If more strength is required, it can be strengthened by induction heating which is also a low-cost method. In order to investigate the effect of induction heating on large diameter shafts, we performed rolling bending fatigue tests using 10 mm diameter specimens. We found that TRO cracks originating from the boundary between the soft and hard layers governed the fatigue fracture of the shafts.

Applied Investigation of Fracture for Low Carbon Steel in Extra-Low Cycle Inverse Rotating Bending Fatigue

2006 ◽  
Vol 324-325 ◽  
pp. 507-510
Author(s):  
You Tang Li ◽  
Zhi Yuan Rui
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Geometrical Parameters ◽  
Low Carbon ◽  
Bending Fatigue ◽  
Cycle Times ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Tip Radius

The applied investigation of regular fracture for low carbon steel under extra-low cycle inverse rotating bending fatigue was studied in this paper. The principle of inverse rotating bending fatigue was explained at first. The effect of experimental parameters on cycle times of fracture, such as the relations of presetting deflection to quality of blanking and cycle times of fracture were discussed through the experiments. The effects of geometrical parameters of notch, such as tip radius, depth and open angle, on cycle times of fracture were studied. The results show that low carbon steel can be regular fractured through inverse rotating bending fatigue. The quality of blanking is depended on presetting deflection of inverse rotating bending.

Fatigue Behaviour of DLC Coated Al 7075-T6 Alloy in an Aggressive Mixture

2014 ◽  
Vol 627 ◽  
pp. 81-84 ◽  
Author(s):  
Sergio Baragetti ◽  
Riccardo Gerosa ◽  
Francesco Villa
Keyword(s):  
High Performance ◽  
Contact Fatigue ◽  
Fatigue Behaviour ◽  
Fatigue Tests ◽  
Structural Elements ◽  
Pvd Coatings ◽  
Bending Fatigue ◽  
Al 7075 ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

7075-T6 aluminium alloy is commonly adopted in high performance structures and components. Its fatigue behaviour is however dramatically worsened by exposure to aggressive environments. The deposition of PVD coatings, which are commonly adopted to increase the surface properties of structural elements in terms of hardness, contact fatigue and wear resistance, could be beneficial also for the fatigue behaviour of a 7075-T6 substrate in an aggressive environment. In the present work, Diamond Like Carbon (DLC) PVD coated 7075-T6 specimens immersed in methanol have been analysed, by means of step-loading rotating bending fatigue tests (R = -1) at 2·105 cycles. Coated specimens were tested in laboratory air for comparison, and uncoated polished samples were studied in both the environments to obtain reference values. SEM micrographs of the fracture surfaces were taken to investigate the effects of the corrosive environment on the failure mechanism.

Large-scale rotating bending fatigue tests for offshore pipe connections

1997 ◽  
Vol 37 (2) ◽  
pp. 147-153 ◽  
Author(s):  
A. H. Varma ◽  
B. W. Russell ◽  
B. Wallace
Keyword(s):  
Large Scale ◽  
Fatigue Tests ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending
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