WANG Xiaopeng,YU Zhilong,YU Feipeng,et al.Research on a risk prediction model of gear tooth flank fracture based on multiaxial stress fatigue criterion[J].Journal of Mechanical Transmission,XXXX,XX(XX):1-9.
WANG Xiaopeng,YU Zhilong,YU Feipeng,et al.Research on a risk prediction model of gear tooth flank fracture based on multiaxial stress fatigue criterion[J].Journal of Mechanical Transmission,XXXX,XX(XX):1-9.DOI:
Research on a risk prediction model of gear tooth flank fracture based on multiaxial stress fatigue criterion
Tooth flank fracture is a contact fatigue failure mode of high-cycle/ultra-high-cycle fatigue damage where cracks initiate due to material damage at deep locations inside the tooth. It is proposed to establish a calculation method for the risk threshold of tooth flank fracture in the gear tooth interior based on the multiaxial stress evaluation approach.
Methods
2
Based on contact theory
gear meshing geometry theory and the fundamental theories of elasticity
a parsing model for the equivalent contact internal-field multiaxial stress of gear pairs was established
and a coupled mathematical model for gradient-bearing contact fatigue risk prediction of gears was formulated. The micro-element discretization numerical method was adopted to solve contact problems involving singular integrals of contact stress components for the elastic half-plane. In addition
research on the risk threshold of tooth flack fracture in the gear tooth interior was conducted based on the multiaxial stress evaluation method.
Results
2
The results indicate that under the multiaxial stress field
the risk threshold is the highest in the zone between the hardened layer and the core inside the gear tooth
where cracks are prone to initiate and the tooth flank fracture failure is prone to occur. The risk threshold obtained by the proposed model is relatively close to that derived from ISO 6336-4 technical specifications. Moreover
the fracture position of the test gear is basically consistent with the risk area calculated by the proposed model. These findings demonstrate that the proposed model can serve as a reference for the preliminary design of gears resistant to tooth surface fracture
and can be used as a tooth flank fracture risk assessment method supplementary to existing technical specifications. The established tooth flank fracture risk prediction model based on multiaxial stress fatigue provides a reference for the design and manufacturing of the gear transmission engineering equipment.
关键词
Keywords
references
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