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Effect of Multiple loading sequence on in-phase thermomechanical fatigue hysteresis of silicon carbide fiber-reinforced ceramic-matrix composites
L. Li
College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, No.29 Yudao St., Nanjing 210016, PR China
received November 27, 2017, received in revised form December 28, 2017, accepted January 29, 2018
Vol. 9, No. 2, Pages 163-174 DOI: 10.4416/JCST2017-00095
Abstract
In this paper, the effect of multiple loading sequence on the in-phase (IP) thermomechanical fatigue (TMF) hysteresis of silicon carbide fiber-reinforced ceramic-matrix composites (SiC-CMCs) has been investigated. Considering the coupling effects of multiple loading sequence, thermal cyclic temperature and applied cycle number, the fiber/matrix interface damage lengths have been determined based on the thermomechanical micromechanical stress field and fracture mechanics method. The relationships between the in-phase TMF hysteresis loops, multiple loading sequence, thermal cyclic temperature and fiber/matrix interface damage state have been established. The in-phase TMF stress/strain hysteresis loops and fiber/matrix interface damage state for different composite material properties, peak stress with different loading sequence and damage state have been discussed. The comparisons of the in-phase TMF stress/strain hysteresis loops and fiber/matrix interface damage between single peak stress and multiple loading sequence have been analyzed. The TMF stress/strain hysteresis loops and fiber/matrix interface damage state of 2D SiC/SiC composite subjected to low-high three loading sequences have been predicted. Under TMF multiple loading sequence, the fiber/matrix interface slip lengths are larger than those under TMF single peak stress, leading to the increase of TMF stress/strain hysteresis loops area, peak and residual strain, and the decrease of hysteresis modulus.
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Keywords
Ceramic-matrix composites (CMCs), thermomechanical fatigue, hysteresis loops, multiple loading sequence
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