scholarly journals Estimation of Crack Propagation Property by the Rotating Bending Fatigue Tests of Specimens with a small Hole

1976 ◽  
Vol 42 (354) ◽  
pp. 325-334 ◽  
Author(s):  
Hironobu NISHITANI ◽  
Takenori MORIMITSU
Keyword(s):  
Crack Propagation ◽  
Fatigue Tests ◽  
Small Hole ◽  
Propagation Property ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
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.

Applied Research of Fracture for Brass in Extra-Low Cycle Inverse Rotating Bending Fatigue

2005 ◽  
Vol 297-300 ◽  
pp. 1077-1082 ◽  
Author(s):  
You Tang Li ◽  
Chang Feng Yan ◽  
Ping Ma
Keyword(s):  
Fracture Toughness ◽  
Crack Propagation ◽  
Applied Research ◽  
Special Equipment ◽  
Bending Fatigue ◽  
Cycle Times ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Tip Radius ◽  
Made In

Rotating bending and inverse rotating bending are the two different forms of fatigue. The application of regular blanking for brass under extra-low cycle inverse rotating bending fatigue was investigated. The principle of inverse rotating bending fatigue was explained at first. And then the experiment of inverse rotating bending fatigue was made in special equipment designed by the authors. Several problems, i.e. the relations of the quantities such as cycle times of fracture, the strain amplitude near the notch tip and fracture toughness of fatigue to the presetting deflection, the effects of depth and tip radius of notch on the cycle times of fracture, were discussed with the helps of experiment. Finally, The relation of depth of crack propagation to cycle times were discussed also. The suitable parameters of inverse rotating bending fatigue for blanking of brass were obtained.

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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