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Proceedings Article

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

[+] Author Affiliations
Navid Nemati, Antonio Nanni

Univ. of Miami (USA)

Brian Metrovich

Case Western Reserve Univ. (USA)

Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79842L (April 18, 2011); doi:10.1117/12.880782
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From Conference Volume 7984

  • Health Monitoring of Structural and Biological Systems 2011
  • Tribikram Kundu
  • San Diego, California, USA | March 06, 2011

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.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Navid Nemati ; Brian Metrovich and Antonio Nanni
"Fatigue and fracture assessment of cracks in steel elements using acoustic emission", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79842L (April 18, 2011); doi:10.1117/12.880782; http://dx.doi.org/10.1117/12.880782


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