The effect of crack propagation mechanism on the fractal dimension of fracture surfaces in steels

被引：39
|
作者：
Dlouhy, I. [1 ]
Strnadel, B. [2 ]
机构：
[1] Acad Sci Czech Republic, Inst Phys Mat, Brno 61662, Czech Republic
[2] Tech Univ Ostrava, Ostrava 70833, Czech Republic
来源：
ENGINEERING FRACTURE MECHANICS | 2008年 / 75卷 / 3-4期
关键词：
low-alloyed steel; fracture surface; fractography; fracture toughness; ductile fracture; brittle fracture; intergranular fracture; fractal dimension;
D O I：
10.1016/j.engfracmech.2007.03.038
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The paper reports on the results of a fractal analysis of fracture surfaces of Ni-Cr steel in two different states of heat treatment simulating embrittlement. The change in the fractal dimension of the fracture surface demonstrates a wavy character and dispersion depending on the microstructural state of the tested steel. The results of the fractal analysis in the crack growth direction and across the entire crack front were used as the basis for a reconstruction of the geometry of the fracture surface, providing a new geometric tool for fractographic analysis. The competing effects of transgranular and intergranular brittle fracture may lead to increased roughness of the fracture surface and its fractal dimension. The threshold value of the fractal dimension of the sections perpendicular to the fracture surface, indicating the transition from transgranular to intergranular fracture, is 1.12. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：726 / 738
页数：13
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