Affiliation of Author(s):民航学院
Journal:ENGINEERING FRACTURE MECHANICS
Key Words:Ceramic-matrix composites (CMCs) Fatigue Hold time Hysteresis loops Matrix cracking Interface debonding
Abstract:In this paper, the synergistic effects of the hold time and cyclic loading on the fatigue hysteresis loops of fiber-reinforced ceramic-matrix composites (CMCs) at elevated temperatures in air condition are investigated. Based on the analysis of relative frictional sliding between fibers and the matrix in the fiber/matrix interface oxidation and interface wear region, the interface debonded length, interface counter-slip length and interface new-slip length are determined using the fracture mechanics approach. The fatigue hysteresis loops models are developed considering the synergistic effects of hold time and cyclic loading. The relationships between the fatigue hysteresis loops models and internal multiple fatigue damage mechanisms are established. The effects of fiber volume fraction, matrix crack spacing, fatigue stress levels, hold time and oxidation temperature on the fatigue hysteresis loops shape, location and area, fatigue hysteresis modulus and the fiber/matrix interface slip lengths are investigated. The experimental fatigue hysteresis loops, fatigue hysteresis dissipated energy, fatigue hysteresis modulus and the fiber/matrix interface slip lengths of cross-ply SiC/MAS and 2D SiC/SiC composites under cyclic loading for different hold time at elevated temperatures in air condition are predicted.
ISSN No.:0013-7944
Translation or Not:no
Date of Publication:2018-08-01
Correspondence Author:llb
Pre One:MODELING IN-PHASE THERMOMECHANICAL FATIGUE HYSTERESIS LOOPS OF FIBER-REINFORCED CERAMIC-MATRIX COMPOSITES
Next One:Monitoring Damage Accumulation in Continuous Fiber-Reinforced Ceramic-Matrix Composites with Different Fiber Preforms under Cyclic Loading Using Hysteresis-Based Damage Parameters
Lecturer
Education Level:南京航空航天大学
Degree:Doctoral Degree in Engineering
School/Department:College of Civil Aviation
Open time:..
The Last Update Time:..