摘要
讨论了复合材料疲劳损伤的数学描述方法，引用等效模量随疲劳过程的降低作为损伤的度量，借助于连续介质损伤力学ＣＤＭ，建立起损伤速率与循环次数之间的幂函数关系。试验发现，疲劳损伤的演变可分为３个阶段，而在一定的应力水平下，稳定扩展的第２阶段占据主导地位，为从理论上预测疲劳寿命成为可能。
The characterization of fatigue damage of composite materials was discussed.The degradation of effective modulus was used as a measurement of damage. Using continuous damage mechanics(CDM) theory, a power relationship is setup between the damage rate (d D /d n ) and cyclic numbers. This provides a well model for the life prediction of composite materials under cyclic loading. Experimental procedures were also performed in order to investigate the damage development during fatigue process.It was found that damage development shows three different stages. This makes it possible to describe fatigue damage theoretically.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1995年第4期501-504,共4页
Acta Aeronautica et Astronautica Sinica
基金
中国科学院力学所非线性连续介质力学开放试验室资助
关键词
复合材料
疲劳寿命
损伤
数学模型
航空材料
composite materials, fatigue life, impairment mathematical models
