Next Article in Journal
Optimization of High Temperature and Pressurized Steam Modified Wood Fibers for High-Density Polyethylene Matrix Composites Using the Orthogonal Design Method
Next Article in Special Issue
A Model of BGA Thermal Fatigue Life Prediction Considering Load Sequence Effects
Previous Article in Journal
Polymer-Cement Composites Containing Waste Perlite Powder
Previous Article in Special Issue
A Constitutive Relationship between Fatigue Limit and Microstructure in Nanostructured Bainitic Steels
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessArticle
Materials 2016, 9(10), 843; doi:10.3390/ma9100843

Interior Fracture Mechanism Analysis and Fatigue Life Prediction of Surface-Hardened Gear Steel under Axial Loading

School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yoshiharu Mutoh
Received: 31 August 2016 / Revised: 29 September 2016 / Accepted: 13 October 2016 / Published: 18 October 2016
(This article belongs to the Special Issue Fracture and Fatigue Mechanics of Materials)
View Full-Text   |   Download PDF [3587 KB, uploaded 18 October 2016]   |  

Abstract

The interior defect-induced fracture of surface-hardened metallic materials in the long life region has become a key issue on engineering design. In the present study, the axial loading test with fully reversed condition was performed to examine the fatigue property of a surface-carburized low alloy gear steel in the long life region. Results show that this steel represents the duplex S-N (stress-number of cycles) characteristics without conventional fatigue limit related to 107 cycles. Fatigue cracks are all originated from the interior inclusions in the matrix region due to the inhabitation effect of carburized layer. The inclusion induced fracture with fisheye occurs in the short life region below 5 × 105 cycles, whereas the inclusion induced fracture with fine granular area (FGA) and fisheye occurs in the long life region beyond 106 cycles. The stress intensity factor range at the front of FGA can be regarded as the threshold value controlling stable growth of interior long crack. The evaluated maximum inclusion size in the effective damage volume of specimen is about 27.29 μm. Considering the size relationships between fisheye and FGA, and inclusion, the developed life prediction method involving crack growth can be acceptable on the basis of the good agreement between the predicted and experimental results. View Full-Text
Keywords: surface-hardened steel; long life fatigue; interior fracture; inclusion; life prediction surface-hardened steel; long life fatigue; interior fracture; inclusion; life prediction
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 alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Li, W.; Deng, H.; Liu, P. Interior Fracture Mechanism Analysis and Fatigue Life Prediction of Surface-Hardened Gear Steel under Axial Loading. Materials 2016, 9, 843.

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]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top