335 SiC/SiC複合材料の低サイクル疲労挙動(OS1-7 疲労特性への影響因子)(OS1 高強度材・表面改質材の疲労と破壊)  [in Japanese] 335 Low-Cycle Fatigue Behavior of SiC/SiC Composites  [in Japanese]

In order to investigate a fatigue properties of SiC/SiC composites, tensile tests and the low cycle fatigue tests of SiC/SiC composites were carried out at room temperature. Two types of SiC/SiC composites were manufactured for the tests. Tensile tests were conducted with a loading rate 0.02,1,10MPa/s to investigate the relationship between the ultimate strength and a loading rate. As a result of tensile tests, it was seen that ultimate strength decreased with a loading rate. Low cycle fatigue tests were conducted with a frequency 0.02Hz and R=-1 with strain-controlled and stress-controlled conditions. As a result of low cycle fatigue tests, it is seen that the SiC/SiC composites offered cyclic softening behavior and the relationship between the strain range and the fatigue live was evaluated as Manson-Coffin's relation.