疲劳损伤过程的热能耗散分析

HEAT ENERGY DISSIPATION IN FATIGUE DAMAGE PROCESS OF MATERIALS

利用能量作疲劳损伤基本参量,建立了疲劳损伤的能耗结构,在试验的基础上,围绕着疲劳损伤过程中的不可逆能耗分析,系统地研究了循环过程及循环内的疲劳损伤热能耗散变化规律,并寻找出疲劳过程中循环滞回能与有效能耗(储能)之间联系。

Using the dissipated energy as an essential parameter, the energy dissipative structure in process of fatigue damage of materials has been established. Through thermodynamic analysis for irreversible energy dissipation in fatigue damage process, the heat dissipative variations in cyclic loading process as well as in a cycle have been systematically stu- died on the basis of low cycle fatigue tests and infrared measurement of self-heating thermography. Meanwhile, the cyclic hysteresis energy and efficicent energy dissipation (stored energy) have been proposed during fatigue damage process.