ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 63, (1) 51 - 66 (2019)


SYNERGISTIC EFFECTS OF FREQUENCY AND TEMPERATURE ON FATIGUE HYSTERESIS OF A CROSS-PLY SiC/MAS COMPOSITE UNDER TENSION-TENSION LOADING
 
Li Longbiao
 
College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, No.29 Yudao St., Nanjing 210016, PR China

Keywords: Ceramic-matrix composites (CMCs) , Fatigue; Hysteresis loops, Hysteresis modulus, Interface shear stress
 

In this paper, the synergistic effects of the loading frequency and testing temperature on the fatigue hysteresis behaviour of a cross-ply SiC/MAS ceramic-matrix composite are investigated. The fatigue stress-strain hysteresis loop models, considering different matrix cracking modes, are developed to establish the relationships among the fatigue hysteresis loops, fatigue hysteresis dissipated energy and fibre/matrix interface shear stress. Comparing the experimental fatigue hysteresis dissipated energy with the theoretical values, the fibre/matrix interface shear stress of the cross-ply SiC/MAS composite under the loading frequency of 1 and 10 Hz at 566 °C and 1093 °C in air conditions are obtained for different applied cycle numbers and fatigue peak stresses. At a low loading frequency of 1 Hz, the fibre/matrix interface shear stress and interface shear stress degradation rate of the cross-ply SiC/MAS are higher than that at the loading frequency of 10 Hz. At 1093 °C in air conditions, the fibre/matrix interface shear stress and interface shear stress degradation rate of the cross-ply SiC/MAS are higher than that at 566 °C in air conditions.


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doi: 10.13168/cs.2018.0045
 
 
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