摘要
该文将微观界面组分纳入宏-细-微三个尺度的多尺度渐进损伤失效分析中。对细、微观单胞模型施加周期性边界条件获取放大因子并采用k-means聚类方法进行缩聚;通过缩聚的放大因子求解宏观模型对应的细、微观组分应力并进行损伤失效判定;计算宏观模型退化后的弹性参数用于后续计算;针对2D编织SiC/SiC复合材料开展了渐近损伤失效分析,并通过不同聚类数目下的计算结果对比证明了所采用聚类数目的正确性。研究结果表明:仿真所得材料强度极限与试验结果一致性较好;微观界面在多尺度分析中不可忽略,不考虑微观界面会导致材料性能大幅强化;采用该文方法可以近似表征2D编织SiC/SiC复合材料界面脱粘和纤维成簇拔出的失效行为。
Microscale interfaces are included in macro-meso-micro multiscale analysis for progressive damage failure.Periodic boundary conditions are applied to the mesoscale and microscale cell model to obtain the amplification factors which are condensed by the k-means clustering method.The condensed amplification factors are used to obtain the stress of mesoscale and microscale components of macroscale models,and the damage failure judgement is conducted.The degraded elastic parameters of the macroscale model are calculated for subsequent calculation.The progressive damage failure analysis of 2D braided SiC/SiC composites is carried out.The correctness of the cluster number is verified by comparing the results calculated by using different cluster numbers.The results show that the material strength limits obtained by the simulation agreed well with the experimental results.The microscale interfaces cannot be ignored in multiscale analysis,or the material property will be greatly strengthened.The failure behavior of interfacial debonding and fiber bundle pullout of 2D braidedSiC/SiC composites can be approximately characterized by this method.
作者
张力
王猛
陈强
李彦斌
皮慧龙
董萼良
ZHANG Li;WANG Meng;CHEN Qiang;LI Yan-bin;PI Hui-long;DONG E-liang(Institute of Aerospace Machinery and Dynamics,Southeast University,Nanjing 211189,China;Department of Engineering Mechanics,Southeast University,Nanjing,Jiangsu 211189,China;School of Mechanical Engineering,Southeast University,Nanjing,Jiangsu 211189,China;Beijing Aerospace Technology Institute,Beijing 100074,China)
出处
《工程力学》
EI
CSCD
北大核心
2022年第3期233-248,共16页
Engineering Mechanics
关键词
复合材料
多尺度分析
渐近损伤
强度
界面损伤失效
composites
multiscale analysis
progressive damage failure
strength
interface damage failure
