Next Article in Journal
Effect of Microstructure on Post-Rolling Induction Treatment in a Low C Ti-Mo Microalloyed Steel
Previous Article in Journal
Effects of Water-Cooling on the Mechanical Properties and Microstructure of 5083 Aluminum Alloy during Flame Straightening
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Metals 2018, 8(9), 693; https://doi.org/10.3390/met8090693

Contact Fatigue Failure Analysis of Helical Gears with Non-Entire Tooth Meshing Tests

1
School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
2
Gear Research Institute, Taiyuan University of Technology, Taiyuan 030024, China
3
Engineering Research Center Heavy Machinery Ministry of Education, Taiyuan 030024, China
*
Authors to whom correspondence should be addressed.
Received: 20 June 2018 / Revised: 22 August 2018 / Accepted: 24 August 2018 / Published: 4 September 2018
Full-Text   |   PDF [17879 KB, uploaded 7 September 2018]   |  

Abstract

This study presents an experimental approach based on partial tooth meshing contact fatigue with constant amplitude and different lengths of load cycles. To achieve this, 20CrH helical gears were considered, limiting the region of interest to one-third of the tooth to accelerate crack initiation and propagation. Different factors, such as number of fatigue cycles, tooth flank morphology, residual stress, hardness, and microstructure evolution under fatigue, were considered. The ultimate goal was to relate these variations with the observed failure modes. The results showed that with increasing cycle number, the residual stress at the same position in the meshing zone of the tooth flank increased first and then decreased. The residual stress values at the lower position of the pitch circle were larger than that of the addendum and dedendum. After cyclic loading, the content of the twin martensite within the microstructure below the pitch circle decreased and the corresponding hardness value of the tooth flank was reduced. After long-term cyclic loading, the precipitated phases aggregated and grew and the discontinuous distribution hindered the grain boundary slip. The dislocation density increased, and the pile-up of dislocation resulted in stress concentration at the grain boundary and the phase boundary, which induced the initiation of fatigue crack of the tooth flank. View Full-Text
Keywords: helical gear; non-entire tooth meshing; contact fatigue test; residual stress; microstructure; failure helical gear; non-entire tooth meshing; contact fatigue test; residual stress; microstructure; failure
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Zhao, F.; Ding, X.; Fan, X.; Cui, R.; Li, Y.; Wang, T. Contact Fatigue Failure Analysis of Helical Gears with Non-Entire Tooth Meshing Tests. Metals 2018, 8, 693.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top