Time-Dependent Response of MI SiC/SiC Composites Part 1: Standard Samples (Preprint)

摘要

With the increased interest in using high performance ceramic matrix composites for advanced applications, long-term property behavior is of interest. In this work, time-dependent response of MI SiC/SiC composites (01/01 material) was experimentally evaluated under creep and dwell fatigue loading. A series of standard samples were tested at 815 degrees Celsius and 1204 degrees Celsius at various stress levels and multiple durations. All specimens showed primary and steady state creep responses. There were also some samples that showed tertiary creep response. Environmental degradation was empirically related to material response at different stress levels. Micrographic images of failed specimens revealed the existence of cavitations that were possibly caused by the creep strain at high stress areas.