关于疲劳能量理论若干问题的讨论

能量方法是疲劳研究的重要分支.由于能量耗散与显微结构的运动和演化有关,因此用能量参数描述疲劳过程具有明确的物理含意.文中对疲劳能量理论从基于机械能耗研究到能量耗散研究的发展历史和现状进行简单的回顾,对目前疲劳能量理论存在的若干主要问题进行讨论.

DISCUSSION ON SEVERAL QUESTIONS ABOUT THE FATIGUE ENERGY THEORY

Energy method is an important branch of fatigue research. For the energy dissipation during fatigue is relevant to the motion and evolution of the microstructures, it is physical meaningful to use energy parameter to describe the process of fatigue damage. The development history of the fatigue energy theory, from the studies based on the mechanical energy to the energy dissipation, is briefly reviewed. Also, three questions about the fatigue energy theory are proposed and discussed. It is concluded that: (a) the stored energy is a reasonable and ideal damage parameter; (b) accurate measurement of the stored energy is a difficult task and depends on the development of advanced experimental techniques and the basic science; (c) deduced from the viewpoint a unified theory for deforming failure of materials may be of energy dissipation and energy fluctuation.