纤维增强韧性基体界面力学行为

分析了纤维增强韧性基体的界面力学行为及其失效机理，按剪滞理论和应变理化规律研究微复合材料的弹塑性变形和应力状态，讨论了幂硬化和线性硬化基体的弹塑性变形和界面应力分布，并给出纤维应力和位移的表达式。按最大剪应力强度理论建立了纤维／基体界面失效准则，推导出弹塑性界面失效的平均剪应力随纤维埋入长度的变化关系。

MECHANICAL BEHAVIOR OF INTERFACE ON FIBER-REINFORCED TOUGHNESS MATRIX

The problem of interfacial mechanical behavior and failure mechanism for the fiber reinforced toughness matrix is analyzed. The elastic plastic deformation and stresses of the micro composite are studied according to the shear lag theory and strain-hardening law. The elastic plastic deformation and interfacial stress distribution for either power hardening or linear hardening matrix are discussed respectively, and the equations of fiber stress and displacement are obtained. The failure criterion of fiber/matrix interface is determined by the maximum shear stress theory. The variation of the mean interfacial shear stress with the fiber embedded length at the critical failure of elastic-plastic interface is deduced.