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

Navid Nemati; Brian Metrovich; Antonio Nanni

doi:10.1117/12.880782

18 April 2011 Fatigue and fracture assessment of cracks in steel elements using acoustic emission

Navid Nemati, Brian Metrovich, Antonio Nanni

Proceedings Volume 7984, Health Monitoring of Structural and Biological Systems 2011; 79842L (2011) https://doi.org/10.1117/12.880782
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

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.

Citation Download 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 (18 April 2011); https://doi.org/10.1117/12.880782

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