Interface of Ceramic-Matrix Composites. Longbiao Li
expansion coefficient of the fiber and the matrix. The characteristics of pyrolytic carbon (PyC) interphase and boron nitride (BN) interphase used in CMCs are also analyzed.
2 (2) The effect of the fiber/matrix interface properties and pre‐exposure on the tensile and fatigue behavior of fiber‐reinforced CMCs is investigated. The experimental tensile and fatigue damage of different CMCs are predicted for different interface properties. The fatigue life S–N curves and fatigue limit stress of unidirectional C/SiC, SiC/CAS (silicon carbide/calcium aluminosilicate) and SiC/1723 (silicon carbide/alkaline‐earth aluminosilicate), cross‐ply C/SiC, SiC/CAS and SiC/1723, 2D C/SiC and SiC/SiC, 2.5D C/SiC, and 3D C/SiC composites are predicted.
3 (3) The relationships between the hysteresis dissipated energy and temperature rising of the external surface in fiber‐reinforced CMCs under cyclic loading are analyzed. Based on the fatigue hysteresis theories considering fiber failure, the hysteresis dissipated energy and a hysteresis dissipated energy‐based damage parameter changing with the increase of cycle number are investigated. The experimental temperature rise‐based damage parameter of unidirectional SiC/CAS‐II, cross‐ply SiC/CAS, and 2D C/SiC composites corresponding to different fatigue peak stresses and cycle numbers are predicted. The fatigue hysteresis behavior of unidirectional, cross‐ply, and 2.5D C/SiC composites at room temperature and 800 °C in air atmosphere are investigated.
4 (4) Comparing experimental fatigue hysteresis dissipated energy with theoretical computational values, the interface shear stress of unidirectional, cross‐ply, 2D, and 3D CMCs at room temperature, 600, 800, 1000, 1200, and 1300 °C in inert, air, and steam conditions, are obtained. The effects of test temperature, oxidation, and fiber preforms on the degradation rate of interface shear stress are investigated, and the comparisons of interface degradation between C/SiC and SiC/SiC composites are analyzed.
I hope this book can help the material scientists and engineering designers to understand and master the interface of CMCs.
26 January 2020
Longbiao Li
Acknowledgments
I am grateful to my wife Peng Li and my son Li Shengning for their encouragement.
A special thanks to Qian Shaoyu, Pinky Sathishkumar, and Nussbeck Claudia for their help with my original manuscript.
I am also grateful to the team at Wiley for their professional assistance.
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