A non-microstructural crack formation model for understanding fatigue life degradation in shot peened carbon steel under LCF loading

Jong Cheon Kim, Seong Kyun Cheong, Hiroshi Noguchi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The present paper was based on the experimental investigation from the previous results that analyzed the residual stress relaxation and its fatigue behavior in shot-peened (SP) specimen during fatigue loading Kim et al. (2013) [12,10]. Here, the non-microstructural crack formation model was proposed to understand fatigue life degradation of SP carbon steel under LCF loading. When the applied stress exceeded the yield strength of the original material from the previous results, the SP specimen showed a shorter fatigue life as compared to the specimen without SP. To demonstrate the empirical model, the fatigue crack initiation and propagation in no SP specimens were observed by the plastic replication method at the LCF loading. The results showed the following: (i) remarked residual stress relaxation occurred under LCF loading which leads to the ability to have a significant influence on the degradation of fatigue life in the SP specimen; (ii) the existing microcracks on the treated surface caused earlier fatigue failure owing to crack formation, which was not influenced by microstructural effects. This presentation will discuss the non-microstructural crack formation in detail and suggest a mechanism for the fatigue life degradation.

Original languageEnglish
Pages (from-to)110-117
Number of pages8
JournalInternational Journal of Fatigue
Volume63
DOIs
Publication statusPublished - Jan 1 2014

Fingerprint

Fatigue Life
Crack initiation
Carbon steel
Steel
Crack
Carbon
Degradation
Fatigue of materials
Fatigue
Stress Relaxation
Residual Stress
Stress relaxation
Microcracks
Fatigue Crack
Crack Initiation
Empirical Model
Crack Propagation
Experimental Investigation
Residual stresses
Model

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this

A non-microstructural crack formation model for understanding fatigue life degradation in shot peened carbon steel under LCF loading. / Kim, Jong Cheon; Cheong, Seong Kyun; Noguchi, Hiroshi.

In: International Journal of Fatigue, Vol. 63, 01.01.2014, p. 110-117.

Research output: Contribution to journalArticle

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