Open AccessMeasurement and analysis of fatigue crack deformation on the macro- and micro-scale
Author(s) -
D. Nowell,
S.J. O’Connor,
Kalin I. Dragnevski
Publication year - 2015
Publication title -
frattura ed integrità strutturale
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.368
H-Index - 19
ISSN - 1971-8993
DOI - 10.3221/igf-esis.33.01
Subject(s) - digital image correlation , displacement (psychology) , macro , materials science , representation (politics) , deformation (meteorology) , perspective (graphical) , structural engineering , tension (geology) , macroscopic scale , scale (ratio) , computer science , composite material , engineering , ultimate tensile strength , artificial intelligence , psychology , physics , quantum mechanics , politics , political science , law , psychotherapist , programming language
The paper describes an experiment which performs in-situ loading of a small compact tension\udspecimen in a scanning electron microscope. Images are collected throughout a number of successive loadincg\udcycles. These are then analysed using digital image correlation (DIC) in order to produce crack flank\uddisplacements as a function of load. This data is then compared with a simple elastic approach, and it is concluded\udthat elastic-plastic analysis is required in order to accurately capture the displacements close to the crack tip. A\udsimple approach due to Pommier and Hamam is therefore employed. This gives a better representation of the\uddata, but predicts a variation of crack tip displacement, , which is difficult to explain from a physical perspective.\udThe need for a more sophisticated analysis of the data is therefore highlighted