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．从能量不可逆耗散的角度入手，探讨了与材料疲劳断裂特性有关的断口分维的属性及断口分维和材料断裂特性间本质的物理联系，认为正确的测量对象应当是断口的面分维而不是目前广泛采用的线分维。
In this paper, the concept of concord scaling factor is suggested. Two types of famousc fractaldimension measure methods (SIA and FPM), which are widely used in the world, on fracture surfaces arc 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, a type of practical measuring technique of the surface fractal dimension issuggested, and some important conclusions arc drawn for the first time: ① the regeneration order aswell as fractal dimension are the principal factors dominating the fracture properties of materials.②the correct measured index for characterizing the notch fracture toughness and other mechanicalpropertics such as ultimate strength is its surface fractal dimension rather than its line fractal dimension.The conclusions drawn in this paper agrees with the ones drawn from the dynamic analysis ofgenerating multifractal fracture surface by means of the authors' chaotic dynamics model and somecxpcrimcntal data.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
1994年第4期514-517,共4页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金
霍英东青年教师基金
关键词
协同标度因子
疲劳断口
测量
分形维数
concord scaling factor, fatigue fracture surface, fractal dimension
