A study on the evaluation of bending fatigue strength for 20CrMoH gear

Zhang, Jing; Zhang, Qi; Xu, Zhe-Zhu; Shin, Gwi-Su; Lyu, Sung-Ki

doi:10.1007/s12541-013-0181-0

Cited by 28 publications

(8 citation statements)

References 7 publications

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“…The material of gear is 18Cr2Ni4WA. In accordance to the standard regulations or looking up in figures [13,15,16,17], we get the mean values of each parameter of gear pairs, and the standard deviation of each parameter based on the aforementioned principles. The variable coefficients are shown in Table 1.…”

Section: Numerical Examplementioning

confidence: 99%

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Reliability analysis of gear transmission with considering failure correlation

Zuo¹,

Yu²,

Mi³

et al. 2015

EiN

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Section: Numerical Examplementioning

confidence: 99%

“…Thus, the failure dependence of a gear in the transmission system should be considered. Reliability models of gear transmission with common cause failures are developed without the assumption of failure independence [5,6,12,14,15].…”

Section: Introductionmentioning

confidence: 99%

Reliability analysis of gear transmission with considering failure correlation

Zuo¹,

Yu²,

Mi³

et al. 2015

EiN

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“…The high strength, low density, and good formability characteristics of 20Cr2Ni4 are desirable for heavy-duty impulse system gears. In the large-scale mechanical equipment research field, there have been extensive studies regarding the implementation of 20Cr2Ni4 in the manufacturing of gears, rolling bearings, and pin bearings [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Bending Fatigue Behaviors Analysis and Fatigue Life Prediction of 20Cr2Ni4 Gear Steel with Different Stress Concentrations near Non-metallic Inclusions

Xing¹,

Wang

Wang³

et al. 2019

Materials

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To investigate the relationship between inclusions and bending fatigue behaviors in 20Cr2Ni4 steel under different stress concentrations. This paper designs a new experimental method to prefabricate different size stress concentrations near the inclusions, and then conducts a new type of bending fatigue test to study the inclusions and their surrounding stress distributions in 20Cr2Ni4 steel. A microhardness tester was combined with laser etching equipment to realize the prefabrication of different stress concentrations at arbitrary positions around any inclusion on the gear steel surface. This method provides an experimental basis for the quantitative analysis of the relationship between stress distribution and fatigue life around the inclusions of heavy-duty gear steels. We also predict the bending fatigue lives of heavy-duty gear steels with different types of inclusions, stress states, and spatial distributions. Then, based on the prefabricated notch parameters and the state of inclusions in the steel, a mathematical model of quantitative analysis is proposed, which can accurately predict the fatigue limit of heavy-duty gear steel. The research results can be applied to the actual use of heavy-duty gears and to the accurate life estimation based on the state of gear stress, thereby providing a quantitative reference model for subsequent gear steel production and gear part processing.

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“…15,16 Many studies have been conducted to evaluate the bending fatigue performance of steel gears in a single tooth bending fatigue test facility. [17][18][19][20][21][22] These investigations were limited to unidirectional loading. The loads were applied at the highest point of single tooth contact, and the actual gear mesh condition was not simulated while applying the loads.…”

Section: Introductionmentioning

confidence: 99%

Effects of frequency on hysteretic heating and fatigue life of unreinforced injection molded polyamide 66 spur gears

Kodeeswaran

Verma

Suresh

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part L:

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Gears are subjected to different rotational speeds/frequencies during their service life. The effect of the rotational speed on the performance of a metal gear is insignificant; however, it affects the thickness of the lubricant film. Polymer gears generate hysteretic self-heating because of the viscoelastic behavior of the material, thereby limiting their performance and usage in applications. The injection molded polyamide 66 spur gears were loaded by ground steel gear at different torques and frequencies using in-house realized servo motor driven gear test rig. Bidirectional loads at frequencies 2, 5, and 7.5 Hz and unidirectional loads at double the frequencies (4, 10, and 15 Hz) were applied on the polymer gears. The surface temperature of the gear due to the material hysteretic self-heating was continuously monitored and was recorded using an infrared thermal camera. Torque applied and angular displacement of the gear mesh were acquired to plot a hysteresis loop. The hysteresis loop area and surface temperature increase with the increase in the torque. Moreover, the bidirectional loads induce higher temperature than the unidirectional loads. This is because the gear tooth deflection increases under the bidirectional loads compared to that under the unidirectional loads for the tested frequencies. The fatigue life of the polymer gears was evaluated at higher frequency for different torques and was compared with that obtained at lower frequency. The gears tested at frequencies 15 and 7.5 Hz under unidirectional and bidirectional loads, respectively, exhibited inferior fatigue life compared to that at 10 and 5 Hz under unidirectional and bidirectional loads, respectively, because the temperature of the gear increases (30.6% and 43.7% for unidirectional and bidirectional loads, respectively) at higher frequencies. Both thermomechanical and root crack failures were observed under the bidirectional loads, whereas the gears exhibited only the root crack failures under the unidirectional loads. The failure morphology studied using the scanning electron microscope indicated straight root crack with overlapping fractured surfaces under both the bidirectional and unidirectional loads.

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A study on the evaluation of bending fatigue strength for 20CrMoH gear

Cited by 28 publications

References 7 publications

Reliability analysis of gear transmission with considering failure correlation

Reliability analysis of gear transmission with considering failure correlation

Bending Fatigue Behaviors Analysis and Fatigue Life Prediction of 20Cr2Ni4 Gear Steel with Different Stress Concentrations near Non-metallic Inclusions

Effects of frequency on hysteretic heating and fatigue life of unreinforced injection molded polyamide 66 spur gears

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