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Analysis of Tooth Root Crack Initiation, Propagation and Fracture Surface Based on Gear Bending Fatigue Test

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Abstract

Cracking from tooth root bending fatigue is the main form of tooth failure. The current research on root crack and fracture is based on analytical and finite element models, while experimental studies are scarcely and not sufficiently deep. Therefore, this paper carries out a detailed study of tooth root crack initiation, propagation, and fracture surface based on gear bending fatigue tests. The double tooth loading test fixture of gear bending fatigue test is designed, and the bending stress of tooth root is derived based on the double tooth loading point. Gear specimens are divided into three parts and are tested in groups at four stress levels. The crack initiation location, propagation path and fracture surface of the test gear are studied to obtain the surface characteristics of the fatigue zone and static fracture zone. The tooth root crack initiation location of the test gear is compared with the traditional 30° tangent method, and the actual crack location is found to be slightly less than 10% smaller than the 30° tangent. This provides an experimental basis for the study of crack-based mesh stiffness and dynamic characteristics.

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Acknowledgments

The authors would like to acknowledge the financial support from the NSFC, the research is funded by National Natural Science Foundation of China (Contract No. 51775036) and these supports are gracefully acknowledged.

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  1. School of Mechanical Engineering, University of Science and Technology Beijing, Haidian District, Beijing, China

    Wei Li, Ziyuan Li & Shenghang Zhang

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  1. Wei Li
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Correspondence to Wei Li.

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Li, W., Li, Z. & Zhang, S. Analysis of Tooth Root Crack Initiation, Propagation and Fracture Surface Based on Gear Bending Fatigue Test. J Fail. Anal. and Preven. 23, 1288–1297 (2023). https://doi.org/10.1007/s11668-023-01685-w

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