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Materials 2015, 8(12), 8338-8354; doi:10.3390/ma8125459

Very High Cycle Fatigue Failure Analysis and Life Prediction of Cr-Ni-W Gear Steel Based on Crack Initiation and Growth Behaviors

1
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
2
Research Center of Advanced Materials Technology, Ritsumeikan University, Kusatsu 5258577, Shiga, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Robert Lancaster
Received: 10 October 2015 / Revised: 17 November 2015 / Accepted: 18 November 2015 / Published: 2 December 2015
(This article belongs to the Special Issue Failure Analysis in Materials)
View Full-Text   |   Download PDF [4185 KB, uploaded 2 December 2015]   |  

Abstract

The unexpected failures of structural materials in very high cycle fatigue (VHCF) regime have been a critical issue in modern engineering design. In this study, the VHCF property of a Cr-Ni-W gear steel was experimentally investigated under axial loading with the stress ratio of R = −1, and a life prediction model associated with crack initiation and growth behaviors was proposed. Results show that the Cr-Ni-W gear steel exhibits the constantly decreasing S-N property without traditional fatigue limit, and the fatigue strength corresponding to 109 cycles is around 485 MPa. The inclusion-fine granular area (FGA)-fisheye induced failure becomes the main failure mechanism in the VHCF regime, and the local stress around the inclusion play a key role. By using the finite element analysis of representative volume element, the local stress tends to increase with the increase of elastic modulus difference between inclusion and matrix. The predicted crack initiation life occupies the majority of total fatigue life, while the predicted crack growth life is only accounts for a tiny fraction. In view of the good agreement between the predicted and experimental results, the proposed VHCF life prediction model involving crack initiation and growth can be acceptable for inclusion-FGA-fisheye induced failure. View Full-Text
Keywords: Cr-Ni-W steel; very high cycle fatigue; interior failure; local stress distribution; initiation and growth; life prediction Cr-Ni-W steel; very high cycle fatigue; interior failure; local stress distribution; initiation and growth; life prediction
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).

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MDPI and ACS Style

Deng, H.; Li, W.; Sakai, T.; Sun, Z. Very High Cycle Fatigue Failure Analysis and Life Prediction of Cr-Ni-W Gear Steel Based on Crack Initiation and Growth Behaviors. Materials 2015, 8, 8338-8354.

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