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Progressive Failure Analysis of Composite Thick-wall Cylinder Using Continuum Damage Mechanics


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Progressive Failure Analysis of Composite Thick-wall Cylinder Using Continuum Damage Mechanics
WU Qi-jun1ZHOU Ke-dong1HE Lei1ZENG Xin1LI Jun-song2
1. School of Mechanical Engineering,NUST,Nanjing 210094,China; 2. No. 208 Research Institute of China Ordnance Industries,Beijing 102202,China
composite thick-wall cylinder progressive failure continuum damage mechanics finite element method
To research the damage mechanism of the composite thick-wall cylinder,based on the continuum damage mechanics theory,an energy-based stiffness degradation method is proposed to predict the progressive failure properties of a steel-carbon fiber /polyimide composite thick-wall cylinder. Three failure modes of carbon fiber /polyimide composites, including fiber breakage,matrix cracking and fiber /matrix interface shear failure are considered in the model. A three-dimensional finite element technique including the multiframe restart analysis and the arc-length algorithm is employed to conduct the progressive failure analysis. The result shows that: matrix cracks first, then the fiber breakage causes final failure of the whole structure before interface shear failure and liner damage; there is no shear failure or lining failure in this process; the strength of fiber decides the strength of composite thick-wall cylinder.


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Last Update: 2012-10-23