Fatigue and fracture assessment of cracks in steel elements using acoustic emission

Navid Nemati, Brian Metrovich, Antonio Nanni

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Single edge notches provide a very well defined load and fatigue crack size and shape environment for estimation of the stress intensity factor K, which is not found in welded elements. ASTM SE(T) specimens do not appear to provide ideal boundary conditions for proper recording of acoustic wave propagation and crack growth behavior observed in steel bridges, but do provide standard fatigue crack growth rate data. A modified versions of the SE(T) specimen has been examined to provide small scale specimens with improved acoustic emission(AE) characteristics while still maintaining accuracy of fatigue crack growth rate (da/dN) versus stress intensity factor (ΔK). The specimens intend to represent a steel beam flange subjected to pure tension, with a surface crack growing transverse to a uniform stress field. Fatigue test is conducted at low R ratio. Analytical and numerical studies of stress intensity factor are developed for single edge notch test specimens consistent with the experimental program. ABAQUS finite element software is utilized for stress analysis of crack tips. Analytical, experimental and numerical analysis were compared to assess the abilities of AE to capture a growing crack.

Original languageEnglish (US)
Title of host publicationHealth Monitoring of Structural and Biological Systems 2011
DOIs
StatePublished - May 24 2011
EventHealth Monitoring of Structural and Biological Systems 2011 - San Diego, CA, United States
Duration: Mar 7 2011Mar 10 2011

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7984
ISSN (Print)0277-786X

Other

OtherHealth Monitoring of Structural and Biological Systems 2011
CountryUnited States
CitySan Diego, CA
Period3/7/113/10/11

Keywords

  • Acoustic emission
  • Crack growth
  • Fatigue
  • Steel
  • Stress intensity factor
  • Structural health monitoring

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Fatigue and fracture assessment of cracks in steel elements using acoustic emission'. Together they form a unique fingerprint.

  • Cite this

    Nemati, N., Metrovich, B., & Nanni, A. (2011). Fatigue and fracture assessment of cracks in steel elements using acoustic emission. In Health Monitoring of Structural and Biological Systems 2011 [79842L] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7984). https://doi.org/10.1117/12.880782