含纳米纤维共晶基陶瓷复合材料的局部应力场  

Local Stress Field of Eutectic Ceramic Composite Containing Nano-fibers

作　　者：刘协权[1] 倪新华[1] 马英忱[1] 高克林[1] 

机构地区：[1]军械工程学院基础部,石家庄050003

出　　处：《硅酸盐通报》2009年第B08期168-171,共4页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(No.10872216);军械工程学院科研基金(YJJXM08006)

摘　　要：通过考虑纳米纤维与共晶界面的相互作用,利用四相模型推导出共晶基陶瓷复合材料中三相胞元内的应力分布规律;根据体积平均应变,得到共晶基陶瓷复合材料的有效柔度增量;由复合材料远场应力边界条件获得棒状共晶体内基体、界面和纳米纤维内的局部应力场。结果表明:棒状共晶体内的局部应力场与共晶体内各组分的刚度和体积含量以及夹杂和界面相的形状有关。由于共晶界面的强约束效应,基体分担的应力数值明显减小,所以共晶界面使共晶基陶瓷复合材料得到了强化。Considering the interaction between nano-fiber and eutectic interface, forth-phase mode was suggested to determine the local stress field distribution of three-phase element in eutectic composite ceramics. On the basis of the volumetric average strain, the effective flexibility increment tensor of eutectic ceramic composite was obtained. The remote stress boundary condition of the euteetic composite ceramics is accounted for getting the local stress field in the matrix, interface and nano-fiber. The results show the local stress field of eutectic ceramic rod is associated with the stiffness and the volume fractions of each component in eutectic ceramic rod, the shape of interface and nano-fiber. The stresses in matrix would decrease due to the strong constraining effects of the eutectie interface. The eutectic inter/ace make the eutectic composite ceramics strengthen.

关 键 词：纳米纤维 共晶基陶瓷复合材料 共晶界面 局部应力场 尺度效应 

分 类 号：O346.12[理学—固体力学]