FATIGUE LIFE PREDICTION FOR COMPOSITE MATERIALS UNDER MULTI-LEVEL LOAD
In order to improve the strength and reduce weight of structure in aero and astro industry, the advanced materials have been widely adopted such as CFR composite materials. The T300/KH304 is one of the advanced materials and will be used for important structure in the future. The fatigue proprieties of materials need to be investigated because of high reliability and integrity for aerospace structure under cyclic load. Firstly the static properties were obtained. The fatigue experiments were carried out under constant amplitude fatigue. Based on the fatigue data and a significant reduction of modulus of composite materials, the fatigue damage was divided into two stages. The fatigue damage model was set up including the strain and stiffness degradation. The static and fatigue failure has been detected by X-ray radiograph and the failure mode under different loads has been analyzed. The fatigue tensiontension tests were observed under multi-level load. Finally, the residual life of the composite material was predicted using the fatigue damage model and the relative error is 3.1％.
Qi Hongyu Wang Yamei Yang Xiaoguang
School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）