Abstract
The low cycle fatigue tests of an orthogonal three-dimensional (3-D) Tyranno fiber reinforced Si–Ti–C–O (SiC) matrix composites were conducted with a sine wave form under stress and strain controls at room temperature. It was shown that the asymmetric response of strain or stress occurs between tension and compression. There is no stress ratio ( R) effect on fatigue life between R=0.1 and −1 at 0.02 Hz. The reduction of Young’s modulus and sliding stress of interface during fatigue was analyzed to interpret experimental results.
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