scholarly journals Rotating Bending Fatigue Fracture from Stealth Defect

2021 ◽  
Vol 70 (11) ◽  
pp. 839-845
Author(s):  
Kiyotaka MASAKI
Keyword(s):  
Fatigue Fracture ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

Study on Micro Drilling — Rotating Bending Fatigue of Micro Carbide Drills

2009 ◽  
Vol 407-408 ◽  
pp. 45-48 ◽  
Author(s):  
Bo Xiao Ma ◽  
Mitsuyoshi Nomura ◽  
Takahiro Kawashima ◽  
Takayuki Shibata ◽  
Yoshihiko Murakami ◽  
...  
Keyword(s):  
Cutting Force ◽  
Fatigue Fracture ◽  
Cobalt Content ◽  
Fatigue Curve ◽  
Ultrafine Grain ◽  
Motion Error ◽  
Bending Fatigue ◽  
Micro Drilling ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

In micro drilling, the run-out of drill due to rotational motion error of spindle or eccentric chucking of drill causes machining error and larger radial forces which may break the drill. Furthermore, because the spindle speed is very high, rotating bending fatigue of drill may dominate the tool life. In the previous work, relationship between bending deflection and radial cutting force, and fatigue fracture of drill were investigated theoretically and experimentally. The objective of this paper is to investigate more in detail the relationship between the radial cutting force/deflection of drill and its fatigue life. A series of pseudo rotating bending fatigue tests was performed by using three types of ultrafine grain carbide drill blank with 0.1mm diameter. The main results obtained are as follows, (1) Rotating bending fatigue curve did not depend on cobalt content and tungsten carbide grain size. This differs from the results of conventional cemented carbides. (2) The fatigue fracture surface was dominantly occupied by fast fracture regions.

The Application of Fracture for Middle Carbon Steel in Extra-Low Cycle Rotating Bending Fatigue Loading

2004 ◽  
Vol 261-263 ◽  
pp. 1153-1158 ◽  
Author(s):  
You Tang Li ◽  
Ping Ma ◽  
Chang Feng Yan ◽  
Fu Yuan Lang
Keyword(s):  
Carbon Steel ◽  
Fatigue Fracture ◽  
Mathematical Expression ◽  
Fatigue Loading ◽  
Bending Fatigue ◽  
Cycle Times ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Tip Radius ◽  
Made In

Safety designs and fracture designs are the two important fields of crack theory. The fracture problems of middle carbon steel under extra-low cycle rotating bending fatigue loading are studied in this paper. The experiments have been made in special rotating bending fatigue fracture machine designed by us. Several problems, the relations of the cycle times of fracture and the strain amplitude near notch tip to the deflection, the effects of depth and tip radius of notch to the cycle times of fracture, are discussed through the experiments. The mathematical expression of fracture toughness to the cycle times of fracture is obtained. The suitable parameters of rotating bending fatigue fracture model for middle-carbon steel in extra-low cycle times has been proposed.

0109 Effect of Rasidual Hydrogen on Rotating Bending Fatigue Fracture of Bearing Steel

2013 ◽  
Vol 2013.50 (0) ◽  
pp. 010901-010902
Author(s):  
Shota MIZUSHIMA ◽  
Noriyasu OGUMA ◽  
Yasuhiro ODAKE ◽  
Yuki SHIMADA
Keyword(s):  
Fatigue Fracture ◽  
Bearing Steel ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

The Application of Fracture for Middle Carbon Steel in Extralow Cycle Inverse Rotating Bending Fatigue Loading

2004 ◽  
Vol 261-263 ◽  
pp. 1147-1152 ◽  
Author(s):  
You Tang Li ◽  
Chang Feng Yan ◽  
Yao Bing Wei
Keyword(s):  
Carbon Steel ◽  
Fatigue Fracture ◽  
Fatigue Loading ◽  
Special Equipment ◽  
Bending Fatigue ◽  
Cycle Times ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Tip Radius ◽  
Made In

The rotating bending and the inverse rotating bending are the two different forms of fatigue fracture. Some fracture problems for middle carbon steel in extra-low rotating bending fatigue loading are studied in this paper. The experiments of inverse rotating bending fatigue have been made in special equipment designed by us. Several problems, the relations of the cycle times of fracture and the strain amplitude near notch tip to the deflection, the relations of the depth of crack propagation to the cycle times of fracture, are discussed through the experiments. The effects of depth and tip radius of notch to the cycle times of fracture are studied also in this paper. The suitable parameters of inverse rotating bending fatigue fracture model for middle-carbon steel in extra-low cycle times has been proposed.

On a New Rotating Bending Fatigue Testing Machine

1966 ◽  
Vol 15 (148) ◽  
pp. 49-54
Author(s):  
Minoru KAWAMOTO ◽  
Katsumi SUMIHIRO ◽  
Koji KIDA
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

A FAST ROTATING BENDING FATIGUE TEST MACHINE

2017 ◽  
Author(s):  
Marco Antonio Meggiolaro ◽  
Jaime T P Castro ◽  
Rodrigo de Moura Nogueira
Keyword(s):  
Fatigue Test ◽  
Test Machine ◽  
Bending Fatigue ◽  
Bending Fatigue Test ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Fast Rotating

A Study onP-S-NCurve for Rotating Bending Fatigue Test for Bearing Steel

2008 ◽  
Vol 51 (2) ◽  
pp. 166-172 ◽  
Author(s):  
Katsuji Tosha ◽  
Daisuke Ueda ◽  
Hirokazu Shimoda ◽  
Shigeo Shimizu
Keyword(s):  
Fatigue Test ◽  
Bearing Steel ◽  
Bending Fatigue ◽  
Bending Fatigue Test ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

Application of ANN Back-Propagation for Fracture Design Parameters in Extra-Low Cycle Rotating Bending Fatigue

2009 ◽  
Vol 610-613 ◽  
pp. 450-453
Author(s):  
Hong Yan Duan ◽  
You Tang Li ◽  
Jin Zhang ◽  
Gui Ping He
Keyword(s):  
Neural Network ◽  
Neural Network Model ◽  
Back Propagation ◽  
Training Data ◽  
Design Parameters ◽  
Ann Model ◽  
Bending Fatigue ◽  
The Neural Network ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

The fracture problems of ecomaterial (aluminum alloyed cast iron) under extra-low cycle rotating bending fatigue loading were studied using artificial neural networks (ANN) in this paper. The training data were used in the formation of training set of ANN. The ANN model exhibited excellent in results comparison with the experimental results. It was concluded that predicted fracture design parameters by the trained neural network model seem more reasonable compared to approximate methods. It is possible to claim that, ANN is fairly promising prediction technique if properly used. Training ANN model was introduced at first. And then the Training data for the development of the neural network model was obtained from the experiments. The input parameters, notch depth, the presetting deflection and tip radius of the notch, and the output parameters, the cycle times of fracture were used during the network training. The neural network architecture is designed. The ANN model was developed using back propagation architecture with three layers jump connections, where every layer was connected or linked to every previous layer. The number of hidden neurons was determined according to special formula. The performance of system is summarized at last. In order to facilitate the comparisons of predicted values, the error evaluation and mean relative error are obtained. The result show that the training model has good performance, and the experimental data and predicted data from ANN are in good coherence.

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.

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