Size Dependent Strength of Fiber Eutectics and Transformation Particles Composite Ceramic
Fiber eutectics and transformation particles composite ceramic possessed good strengths and creep resistance.It is mainly composed of fiber eutectics with random orientation and transformation particles.First,on basis of the strong constraining effect of the microstructure in fiber eutectics,the micromechanical stress field in fiber eutectics is determined by shear stress that develop between the fiber-inclusion and matrix is obtained.Then,the stress concentration duo to the dislocation pileup on the fiber-matrix interphase is analysised,and the maximum stress in matrix is obtained.Letting maximum stress in matrix equaled to theoretical strength of matrix,the micro strength formation of fiber eutectics is gotten.Finally,considering random orientation and length of fiber eutectics,the macro mechanical strength model of fiber eutectics and transformation particles composite ceramic is built.Result indicates that the fracture strength of composite ceramic has obvious size dependence:the fracture strength of composite ceramic will increase as the diameter of the fiber inclusion in fiber eutectics decrease.
Fiber eutectics fiber-inclusion strong constraining interphase dislocation pileup size dependent strength
Xinhua Ni Tao Sun Xiequan Liu Qinghua Gu Xiangfeng Meng
Department of Basic Course, Mechanical Engineering College, Shijiazhuang 050003, China
国际会议
重庆
英文
2264-2268
2010-12-11（万方平台首次上网日期，不代表论文的发表时间）