Contact Fatigue Crack Propagation Characteristics of Cylindrical Gear with Variable Hyperbolic Circular-arc-tooth-trace

doi:10.3901/JME.2024.21.180

Abstract

Abstract: In order to explore the propagation mechanism of contact fatigue crack of the Cylindrical Gear with Variable Hyperbolic Circular-arc-tooth-trace gear(VH-CATT), guide the design optimization of gear and reduce the crack propagation speed, a numerical calculation model of contact ellipse of VH-CATT cylindrical gear is established based on the curvature characteristics of gear. The contact trajectory of tooth surface ellipse is analyzed by finite element method and numerical calculation method, and the dangerous position of gear crack is determined. The extended finite element method (XFEM) is used to analyze the propagation law of contact fatigue cracks in VH-CATT cylindrical gears. By establishing the stress intensity factor analysis model of VH-CATT cylindrical gear, the influence of modulus, tooth line radius and crack preset angle on mode I stress intensity factor is analyzed. The results show that in the stage of long crack propagation, the larger the gear modulus, the larger the stress intensity factor of the crack in the direction of tooth width and tooth core. The stress intensity factor of the crack front in the long crack propagation stage can be effectively reduced when the radius of the tooth line is large. When the crack preset angle is large, the stress intensity factor in the direction of tooth width and tooth core also increases.

Key words: VH-CATT cylindrical gear, contact fatigue crack, crack propagation, XFEM simulation, stress intensity factor

CLC Number:

TH114

WEI Yongqiao, LIU Wenwen, GUO Rui, LUO Lan, WANG Shaojiang, QI Xiaohu, ZHANG Jianquan. Contact Fatigue Crack Propagation Characteristics of Cylindrical Gear with Variable Hyperbolic Circular-arc-tooth-trace[J]. Journal of Mechanical Engineering, 2024, 60(21): 180-195.

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