强界面氧化铝纤维铝基复合材料高疲劳抗力机理研究

The effects of pre-tension and surface coating on the fatigue fracture process of Al2O3f/Al composite were studied. A physical model describing the fatigue fracture mechanism for continuous fiber reinforced composites with strong interfacial bond was proposed. The relaxation role of matrix to the stress concentration in the composite with strong interfacial bond was investigated using Finite Element.Analysis. Meanwhile, A model to calculate the contact angle and work of adhesion for.reactive metal/ceramic system was established based on surface thermodynamics.theory. The model is generally valid for not only the system with a new phase formed at the interface, but also the ones with localized chemical bonds at the interface.

本经费是对50071031 项目经费的增加。原项目经费13 万元，将于2003 年底完成。两年来的工作，研究了预拉伸和表面涂层对复合材料疲劳性能的影响；通过疲劳断口分析和夭折试验，研究了复合材料疲劳断裂的物理过程，提出了描述强界面结合纤维增强复合材料疲劳断裂的物理模型；通过有限元分析，初步研究了强界面下基体强度对应力集中的缓解作用。同时，研究了与界面结合强度密切相关的纤维与基体间的润湿机理，将金属/陶瓷间的润湿处理为金属/陶瓷表面相间的润湿，根据表面热力学理论提出了定量计算润湿角和粘着功的数学模型。该模型既涵盖了传统的相互争论的两种润湿和粘着理论,又可以处理传统理论不能解决的问题。