SYMPOSIA PAPER Published: 01 January 1994

Comparison of Tension and Flexure to Determine Fatigue Life Prediction Parameters at Elevated Temperatures


High temperature slow crack growth of a hot-pressed silicon nitride (NCX 34) was determined at temperatures of 1200 and 1300°C in air. Three different testing methods were utilized: dynamic and static fatigue with bend specimens, and static fatigue with dog-bone-shaped tensile specimens. Good agreement exists between the dynamic and static fatigue results under bending. However, fatigue susceptibility in uniaxial tensile loading was greater than in bending. This result suggests that high temperature fatigue behavior should be measured with a variety of specimen configuration and loading cycles so that adequate lifetime prediction parameters are obtained.

Author Information

Choi, SR
NASA Lewis Research Center, Cleveland, OH
Salem, JA
NASA Lewis Research Center, Cleveland, OH
Palko, JL
NASA Lewis Research Center, Cleveland, OH
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: C28
Pages: 98–111
DOI: 10.1520/STP12777S
ISBN-EB: 978-0-8031-5268-7
ISBN-13: 978-0-8031-1864-5