Accumulation of Time-Dependent Strain during Dwell-Fatigue Experiments of iBN-Sylramic Melt Infiltrated SiC/SiC Composites with and without Holes (Preprint)
Abstract
Accumulation of time-dependent strain during dwell-fatigue experiments of iBN-Sylramic Melt Infiltrated SiC/SiC composites is investigated. A 2-hour load cycle is repeated for specimens without holes and specimens with a central hole under the following conditions: i) a stress ratio of 0.05, ii) various stress levels, iii) 815 deg C and 1204 deg C, iv) different times up to 600 hours, and v) different hole diameters. An increase in the accumulation of time-dependent strain with the increase in time and stress level is observed for specimens with and without holes with the time-dependent strain at 1204 deg C, much higher than that observed at 815 deg C. All specimens recovered part of their time-dependent strain at the minimum stress level and the value of both time-dependent strain and recovery strain depreciated with time.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2011
- Accession Number
- ADA549095
Entities
People
- G. Morscher
- G. Ojard
- J. Ahmad
- Jiayu Chen
- R. John
- Rachel A. Miller
- U. Santhosh
- Y. Gowayed
Organizations
- Air Force Research Laboratory