Fatigue cracks nucleation on steel, acoustic emission and fractal analysis

被引：56
作者：
Biancohni, M. E.
Brutti, C.
Paparo, G.
Zanini, A.
机构：
[1] Univ Roma Tor Vergata, Dept Mech Engn, I-00133 Rome, Italy
[2] CNR, Inst Acoust OM Corbino, I-00133 Rome, Italy
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2006年 / 28卷 / 12期
关键词：
fatigue; crack nucleation; acoustic emission; fractal;
D O I：
10.1016/j.ijfatigue.2005.12.003
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this paper, a new acoustic emission (AE) diagnostic technique, for the study of fatigue cracks nucleation and propagation on steel, was investigated. Using the fractal analysis, and the box-counting method (BCM) in particular, it is possible to characterize the spatial distribution of the prime AE sources through the fractal dimension (D) that evolve with the number of fatigue cycles (N) of the specimen. D-N curves were found useful to identify the condition of incipient collapse due to the nucleation and propagation of fatigue cracks on steel. It is possible to use the fractal dimension as a damage parameter. In all tested specimens, the crisis occurs within the same range of values of fractal dimension. The results suggest that it is possible to anticipate the detection of crack beginning relating to the other theoretical or experimental techniques. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1820 / 1825
页数：6
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