Skip to main content
padlock icon - secure page this page is secure

Fatigue Threshold

Buy Article:

$52.00 + tax (Refund Policy)

To better understand the role of grain size and grain‐boundary adhesion on the fatigue threshold R‐curve behavior of grain bridging ceramics, a study was conducted on the fatigue threshold behavior of 99.5% pure polycrystalline alumina with two different microstructures (fine and coarse) and in two different environments (moist air and dry N2). The fine‐grained microstructure showed higher fatigue thresholds at short crack sizes, while the coarse‐grained microstructure demonstrated higher fatigue thresholds at long crack sizes. The former effect lead to slightly higher calculated fatigue strengths and was attributed to the crack stalling process that leads to earlier elastic bridge formation in that microstructure. The latter effect is attributed to toughening that is dominated by frictional and mechanical interlocking bridges at longer crack sizes where the larger grains are able to give more bridging. By testing the coarse microstructure in a dry environment, a higher K 0 was achieved for the glassy grain boundaries giving a higher R‐curve at short crack sizes and higher calculated fatigue strengths.
No References
No Citations
No Supplementary Data
No Article Media
No Metrics

Document Type: Research Article

Affiliations: 1: Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, Oregon 97331 2: Institute for Ceramics in Mechanical Engineering, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany

Publication date: August 1, 2011

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more