Evaluation of Fatigue Life of Automotive Bevel Gear

This paper presented the results for experimental investigations and numerical analysis performed with the aim of studying on fatigue life of hobbed and cold forged bevel gears used in automobiles. To evaluate the bending fatigue strength improvement by cold forging process, fatigue test and analysis were performed. For the monotonic fatigue loading, bending fatigue test and analysis were carried out. To simulate the real driving condition, random fatigue loading was defined here, and the random fatigue analysis was also performed. It was concluded that fatigue life and crack initiation sites of automotive bevel gear were well agreed with the test results. Fatigue lives for hobbed and cold forged bevel gear from experimental and analytical investigation were also presented and compared.

Download Full-text

Random Fatigue Analysis of Automotive Bevel Gear

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.326-328.987 ◽

2006 ◽

Vol 326-328 ◽

pp. 987-990 ◽

Cited By ~ 2

Author(s):

Duck Hoi Kim ◽

Jae Hoon Kim ◽

Gi Gwang Kim ◽

Young Shin Lee

Keyword(s):

Fatigue Life ◽

Fatigue Test ◽

Fatigue Analysis ◽

Bevel Gear ◽

Test Results ◽

Random Loading ◽

Bending Fatigue ◽

Bending Fatigue Strength ◽

Applied Stresses ◽

Random Fatigue

The most common mode of the gear failure is tooth breakage, which is usually produced by bending fatigue failure. It is important to manufacture the gears which can withstand the applied stresses in view of safety and economic requirements. In this study, fatigue test and analysis were performed to evaluate the bending fatigue strength of an automotive bevel gear. Test fixtures of the double tooth concept were considered to obtain reliable fatigue test results. Fatigue life of automotive bevel gear was evaluated by Weibull analysis. To compare the test results and to verify the fatigue analysis procedures, fatigue analyses were carried out. The results of fatigue analysis show that fatigue life and crack initiation sites were well agreed with test results. The random loading of bevel gear under the real driving conditions was defined here, and then the fatigue analysis under random loading was also performed.

Download Full-text

Study on Fatigue Test and Life Prediction of Polyurethane Cement Composite (PUC) under High or Low Temperature Conditions

Advances in Materials Science and Engineering ◽

10.1155/2020/2398064 ◽

2020 ◽

Vol 2020 ◽

pp. 1-14

Author(s):

Hongshuai Gao ◽

Quansheng Sun

Keyword(s):

Fatigue Life ◽

Fatigue Test ◽

Asphalt Mixture ◽

Cement Composite ◽

Control Mode ◽

Fatigue Properties ◽

Coupling Condition ◽

Bending Fatigue ◽

Bending Fatigue Test ◽

Steel Deck

There are many diseases in the deck pavement of long-span steel bridges under the action of vehicles, rainwater, and freezing. It is necessary to study a new type of pavement material with high waterproof property, light weight, and high bonding performance for steel deck pavement. Polyurethane cement composite (PUC) can be used for steel deck pavement. In order to find out the temperature effect on fatigue properties of PUC, the four-point bending fatigue test was carried out at different temperatures. In this paper, the optimum mix ratio of PUC was selected by compressive and flexural tests, and then the bending fatigue test was conducted under strain control mode. Under temperature and external force coupling condition, a method for predicting fatigue life of PUC is proposed by the combination of theoretical deduction and experimental research. The results show that the proposed formula can effectively describe the fatigue life and fatigue limit of PUC. Finally, compared with three different asphalt mixtures for steel deck pavement, it is found that the fatigue performance of polyurethane cement is better than that of asphalt mixture.

Download Full-text

On the Damage Line for the Fatigue Life of Carbon Steel : under Completely Reversed Plane Bending Fatigue Test

Transactions of the Japan Society of Mechanical Engineers ◽

10.1299/kikai1938.31.25 ◽

1965 ◽

Vol 31 (221) ◽

pp. 25-33 ◽

Cited By ~ 1

Author(s):

Minoru KAWAMOTO ◽

Katsumi SUMIHIRO ◽

Yukio KUBO

Keyword(s):

Fatigue Life ◽

Carbon Steel ◽

Fatigue Test ◽

Bending Fatigue ◽

Bending Fatigue Test ◽

Plane Bending

Download Full-text

Three-Point Bending Fatigue Test of TiAl6V4 Titanium Alloy at Room Temperature

Advances in Materials Science and Engineering ◽

10.1155/2019/2842416 ◽

2019 ◽

Vol 2019 ◽

pp. 1-11 ◽

Cited By ~ 2

Author(s):

Juraj Belan ◽

Lenka Kuchariková ◽

Eva Tillová ◽

Mária Chalupová

Keyword(s):

Fatigue Life ◽

Fatigue Test ◽

Room Temperature ◽

Fatigue Tests ◽

Dynamic Force ◽

Bending Fatigue ◽

Three Point Bending ◽

Bending Fatigue Test ◽

Number Of Cycles ◽

Test Loading

A polycrystalline alpha-beta TiAl6V4 alloy in the annealed condition was used for the three-point bending fatigue test at frequency f∼100 Hz. The static preload Fstat. = −15 kN and variable dynamic force Fdyn. = −7 kN to −13.5 kN were set as fatigue test loading parameters. The fatigue life S-N curve presented the stress amplitude σa as a function of a number of cycles to fracture Nf. A limiting number of cycles to run out of 2.0 × 107 cycles were chosen for the 3-point fatigue tests of rectangular specimens. In addition, the Smith diagram was used to predict the fatigue life. The alpha lamellae width has a significant influence on fatigue life. It is assumed that the increasing width of alpha lamellae decreases fatigue life. A comparison of fatigue results with given alpha lamellae width in our material to the results of other researchers was performed. The SEM fractography was performed with an accent to reveal the initiation sites of crack at low and high load stresses and mechanism of crack propagation for the fatigue part of fracture.

Download Full-text