Experimental investigation of crack growth behaviors and mechanical properties degradation during gear bending fatigue

Yan, Huan; Wei, Peitang; Zhou, Pengliang; Chen, Ling; Liu, Huaiju; Zhu, Caichao

doi:10.1007/s12206-022-0214-7

Cited by 13 publications

(2 citation statements)

References 37 publications

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“…This, in turn, prevented the continuous propagation of cracks and lowered their propagation rate. It is worth noting that the improvement in fatigue strength owing to SP may experience some relaxation of residual stress over time, as noted by Yan et al [40]. Nevertheless, the presence of a plastic deformation layer, characterized by a residual compressive stress layer, facilitated the migration of crack sources deeper within the gear teeth.…”

Section: Residual Stressesmentioning

confidence: 90%

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

Lv,

Cui,

Sun

et al. 2024

Surf. Topogr.: Metrol. Prop.

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In this paper, shot peening (SP) was employed as a post-processing technique for the laser surface melted (LSMed) gear. The aim was to improve the contact fatigue performance of laser surface melting+shot peened (LSMSPed) gears. The microstructure, surface roughness, residual stress, microhardness of C40 steel gears before and after SP treatment were characterized using scanning electron microscopy, X-ray diffraction stress analyzer, contour measuring instrument, and hardness tester. Fatigue test of gear was carried out with a Forschungsstelle für Zahnräder und Getriebebau (FZG) testing machine. Following the laser surface melting (LSM) treatment, a molten layer was observed on the gear teeth surface. The experimental results indicated that SP induced a hardened layer with a certain thickness and plastic deformation on the surface of LSMed gears. Importantly, as the SP parameters increased, there's a corresponding reduction in both the average grain diameter and the maximum grain diameter. The reduction was most pronounced when the shot diameter reached its maximum value. It's worth noting that once the optimal threshold for SP parameters is surpassed, the residual compressive stress and microhardness on the LSMSPed gear surface do not exhibit a continuous growth trend. Furthermore, the rise in SP parameters resulted in a gradual increase in the surface roughness of LSMSPed gears, albeit to varying degrees. In light of the combined effects of grain refinement, residual compressive stress, microhardness, and surface roughness, the contact fatigue performance of LSMSPed gears improved with increasing SP parameters. Notably, when comparing the contact fatigue life of LSMed gears with that of LSMSPed gears, we observed a substantial enhancement. However, it's essential to highlight that when the shot diameter reaches its maximum value, the contact fatigue life of the LSMSPed gear, somewhat unexpectedly, decreased.

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Section: Residual Stressesmentioning

confidence: 90%

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

Lv,

Cui,

Sun

et al. 2024

Surf. Topogr.: Metrol. Prop.

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show abstract

“…Supported by fractography and metallurgical methods, Xu et al [10] found that the first crack of a 12 mm modulus wind turbine gear, which was mainly caused by non-metallic inclusions, initiates approximately 3 mm from the groove during the carburization-quenching process. Yan et al [11] investigated the fatigue crack propagation behaviour using bending fatigue tests with case-carburized and shot-peening gears and found a crack trajectory of around 30 • and a relaxation of residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Crack Propagation Behaviour in Thin-Rim Gears: Experimental Tests and Numerical Simulations

et al. 2023

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Thin-rim gears are widely used in industrial fields such as aerospace and electric vehicles due to the advantage of light weight. Yet, the root crack fracture failure of thin-rim gears significantly limits their application and further affects the reliability and safety of high-end equipment. In this work, the root crack propagation behavior of thin-rim gears is experimentally and numerically investigated. The crack initiation position and crack propagation path for different backup ratio gears are simulated using gear finite element (FE) models. The crack initiation position is determined using the maximum gear root stress position. An extended FE method coupled with commercial software ABAQUS is used to simulate the gear root crack propagation. The simulation results are then verified by conducting experimental tests for different backup ratio gears based on a dedicated designed single-tooth bending test device.

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Development and application of high strength gears

Wu,

Wei,

Zhu

et al. 2024

Int J Adv Manuf Technol

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Experimental investigation of crack growth behaviors and mechanical properties degradation during gear bending fatigue

Cited by 13 publications

References 37 publications

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

The effect of shot peening on the contact fatigue performance of C40 steel gears after laser surface melting

Investigation of Crack Propagation Behaviour in Thin-Rim Gears: Experimental Tests and Numerical Simulations

Development and application of high strength gears

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