作　　者： ; ; ;

机构地区： 南京航空航天大学能源与动力学院

出　　处： 《固体力学学报》 2009年第1期8-14,共7页

摘　　要： 采用细观力学方法对脆性纤维增强的陶瓷基复合材料拉-拉疲劳载荷下应力-应变迟滞回线进行了研究,将拉梅公式与库仑摩擦法则相结合分析了界面脱粘区以及粘结区复合材料细观应力场,根据卸载与重新加载时纤维相对基体滑移机制,分析了加卸载纤维轴向应力分布,结合断裂力学界面脱粘准则确定了初始加载界面脱粘长度ls、卸载界面反向滑移长度y以及重新加载界面滑移长度z′,讨论了界面脱粘能和界面摩擦系数对初始界面脱粘、卸载界面反向滑移、重新加载界面滑移以及加卸载迟滞回线的影响,并与Pryce-Smith模型和试验数据进行对比表明:该文模型与试验曲线吻合的较好. The stress/strain hysteresis loops under tensile-tensile fatigue loading of brittle fiber rein-forced ceramic matrix composites has been studied using a mieromeehanical approach. A Lame formulation incorporated with Coulomb friction law was adopted to solve the elastic states of fiber/matrix stress trans-fer through a frictionally constrained interface in the slipping region and the interface bonding region. Based upon the mechanisms of the fiber sliding relative to the matrix during unloading and reloading, the fiber axial stress distribution during unloading and reloading has been analyzed. The interface de-bonding length Is during the first loading, the interface counter-slip sliding length y during unloading and the inter-face sling length z＇ during reloading has been determined through fracture mechanics interface de-bonding criterion. The influence of interface de-bonding energy and the interface friction coefficient on the initial in- terface de-bonding, interface counter-slip during unloading, the interface sliding during reloading and the stress strain hysteresis loops has been discussed. The predicted stress-strain hysteresis loop has been com- pared with Pryee-Smith model and experimental data.

关 键 词： 陶瓷基复合材料 疲劳 迟滞回线 界面脱粘 库仑摩擦

领　　域： [建筑科学] [建筑科学] [化学工程] [化学工程]