ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 17 May 2006
Page Count: 10

Detection of Crack Initiation by Observations of Free Surface Condition

Ichinose, K
Professor, Tokyo Denki University, Tokyo,

Yoshida, S
Associate Professor, Southeastern Louisiana University, Hammond, LA

Gomi, K
Assistant Professor, Tokyo Denki University, Tokyo,

Taniuchi, K
Former Professor, Meiji University,

Fukuda, K
Professor, Tokyo National College of Technology, Tokyo,

Ishii, H
Graduate Student, Tokyo Denki University, Tokyo,

(Received 7 April 2005; accepted 12 August 2005)

Abstract

A simple method to detect crack initiation is presented. By polishing the surface of carbon steel structure properly and using the Lüders bands and orange peel as indicators for damage, it is possible to predict crack initiation with the naked eye. The initiation of the Lüders bands is the yellow light of the crack initiation, for instance, in the traffic signal, and orange peel is the red light. The relationship between the observed surface condition and the cyclic stress-strain characteristics is discussed.

Keywords:
fatigue damage, cyclic stress-strain diagram, low cycle fatigue, fatigue crack initiation, Lüders band, orange peel

Paper ID: JAI13189
DOI: 10.1520/JAI13189
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