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

Ceramics-Silikáty 63, (3) 330 - 337 (2019)

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), Proportional limit stress, Interface debonding.

In this paper, the temperature-dependent proportional limit stress of carbon fiber-reinforced silicon carbide ceramic-matrix composites (C/SiC CMCs) is investigated using the energy balance approach. The temperature-dependent micromechanical parameters of fiber and matrix modulus, fiber/matrix interface shear stress and interface debonded energy, and matrix fracture energy are incorporated into the analysis of the micro stress analysis, fiber/matrix interface debonding criterion and energy balance approach. The relationships between the proportional limit stress, fiber/matrix interface debonding and temperature are established. The effects of fiber volume fraction, fiber/matrix interface shear stress, interface frictional coefficient, interface debonded energy and matrix fracture energy on the proportional limit stress and fiber/matrix interface debonding length versus temperature curves are discussed. The experimental proportional limit stress and fiber/matrix interface debonding length of 2D C/SiC composite at elevated temperatures of 973K and 1273K are predicted. For C/SiC composite, the proportional limit stress of C/SiC composite increases with temperature, due to the increasing of fiber/matrix interface shear stress and decreasing of the thermal residual stress.

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doi: 10.13168/cs.2019.0028
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