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Affiliation of Author(s):能源与动力学院

Journal:Tuijin Jishu

Abstract:In order to study high temperature fatigue characteristic of unidirectional carbon/carbon composites, the residual stiffness model and residual strength model of carbon/carbon composites considering temperature and oxidation rate were proposed from fatigue damage mechanics. Tensile/tensile fatigue experiment and residual strength experiment of [0]16 unidirectional carbon/carbon composite laminates specimens with and without anti-oxidation coating also were carried out at room temperature and 700℃. The experiment results show that residual stiffness curves of unidirectional carbon/carbon composites have three stages and present lying "S". The stiffness of unidirectional carbon/carbon composites with anti-oxidation coating decline sharply in initial stage and last stage of fatigue at room temperature and 700℃, but the stiffness have no obvious degradation in middle stage of fatigue. The stiffness degradation of unidirectional carbon/carbon composites is less than 10% at room temperature. However, the stiffness degradation of unidirectional carbon/carbon composites with anti-oxidation coating become more than 30% at 700℃. The unidirectional carbon/carbon composites without anti-oxidation coating exist stiffness degradation obviously, and there is no stiffness sudden drop when material access fatigue life. The fitting results of the model show that the high temperature residual stiffness model and residual strength model of composites can predict well on residual stiffness and residual strength changes of unidirectional carbon/carbon composites at room temperature and 700℃. © 2019, Editorial Department of Journal of Propulsion Technology. All right reserved.

ISSN No.:1001-4055

Translation or Not:no

Date of Publication:2019-02-01

Co-author:Chen, Bo,wwd,cht,zhj,XuYing

Correspondence Author:Chen, Bo,cb