Affiliation of Author(s):民航学院

Journal:JOURNAL OF AEROSPACE ENGINEERING

Key Words:Ceramic-matrix composites (CMCs) Airworthiness Thermomechanical fatigue Damage accumulation Phase angle

Abstract:Under thermomechanical fatigue (TMF) loading, the thermal cyclic temperature may change with decreasing or increasing applied stress upon unloading or reloading. The damage inside of fiber-reinforced ceramic-matrix composites (CMCs) is affected by the phase angle. In this paper, the thermomechanical fatigue behavior of fiber-reinforced CMCs corresponding to different phase angles of =0, /3, /2, and has been investigated. The damage accumulation processes considered the coupling effects of the temperature changing with applied stress in each applied cycle and the degradation of fiber/matrix interface shear stress with increasing applied cycles. The relationships between the thermomechanical fatigue damage mechanisms, hysteresis parameters (i.e.,hysteresis energy and peak strain), phase angle, and interface damage condition have been established. The thermomechanical fatigue behavior for different fiber volume content, peak stress, and matrix crack spacing have been analyzed for different phase angles. The damage accumulation of cross-ply SiC/magnesium aluminosilicate (MAS) composite under thermomechanical fatigue loading have been predicted for different phase angles of =0 and .

ISSN No.:0893-1321

Translation or Not:no

Date of Publication:2018-07-01

Correspondence Author:llb