疲劳断口分维测量原理及其物理机制  

PRINCIPLE AND MECHANISM OF FRACTAL DIMENSION MEASURING OF FATIGUE FRACTURE SURFACE

作　　者：董聪[1] 郦正能[1] 

机构地区：[1]北京航空航天大学飞行器设计与应用力学系

出　　处：《北京航空航天大学学报》1995年第2期28-32,共5页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金;博士后基金

摘　　要：提出了协同标度因子的概念，研究并指出了目前国际上广泛采用的两种疲劳断口分维测量方法（ＳＩＡ和ＦＰＭ）存在的一些实质性问题，认为正确表征断口特性的物理量应是断口的面分维和断口的分形阶数，而不是目前广泛采用的线分维．The concept of concord scaling factor is suggested,two types of famouse fractal dimension measure methods(SIA and FPM), which are widely used in the world,on fracture surfaces are analyzed,and some principal disadvantages related to the above methods are pointed out. From the view point of energy dissipation,the physical mechanism of generating multifractal fracture surface is explained,and some important conclusions are drawn for the first time that ① the regeneration order as well as fractal dimension are the principal factors of dominating the fracture properties of materials. ②the correct measured object on the notch is its surface fractal dimension rather than its line fractal dimension.

关 键 词：疲劳断裂 断口检查 分维测量 协同标度因子 

分 类 号：O346.1[理学—固体力学]