Micromechanical Strength Model of Nano-Transformation Composite Ceramics
Recent experiment showed that nano- transformation composite ceramics, fabricated through SHS process, can acquire high toughening and strengthening. The composite ceramics that contains nano-fibers and transformation particles, fabricated through SHS process, is performed with high fracture toughness and high plasticity. The matrixes of composite ceramics were mainly composed of fiber eutectics with nano-fibers. The transformation particles were distributed along boundaries of the fiber eutectics. First, it can be visualized that tensile force is transmitted from the matrix of the eutectic to the nano-fiber by means of shear stress that develop along the fiber- matrix interface. Then the micromechanical strength model of the fiber eutectic is built. The longitudinal tensile stress of the fiber eutectic and shear stress on the surface of the fiber eutectic structure are obtained. They related to the volume fraction and slenderness ratio of the nano-fibers, and external strain of the fiber eutectic. Then considering random orientation of the fiber eutectic structure, as composite ceramics is subjected to tensile stress, external strain of the fiber eutectic structure can be determined. Finally, theoretical expression for the strength prediction of composite ceramics is gotten.
nano-fiber transformation particles fiber eutectic structure micromechanical strength model.
ZHENG Jian NI Xinhua KANG Jingxin
Shijiazhuang Mechanical Engineering College, Shijiazhuang 050003, P. R. China
国际会议
北京
英文
2007-08-05（万方平台首次上网日期，不代表论文的发表时间）