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 language | English |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 7984 |
| DOIs | |
| State | Published - May 24 2011 |
| Event | Health Monitoring of Structural and Biological Systems 2011 - San Diego, CA, United States Duration: Mar 7 2011 → Mar 10 2011 |
Other
| Other | Health Monitoring of Structural and Biological Systems 2011 |
|---|---|
| Country | United States |
| City | San Diego, CA |
| Period | 3/7/11 → 3/10/11 |
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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
Cite this
Fatigue and fracture assessment of cracks in steel elements using acoustic emission. / Nemati, Navid; Metrovich, Brian; Nanni, Antonio.
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7984 2011. 79842L.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Fatigue and fracture assessment of cracks in steel elements using acoustic emission
AU - Nemati, Navid
AU - Metrovich, Brian
AU - Nanni, Antonio
PY - 2011/5/24
Y1 - 2011/5/24
N2 - 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.
AB - 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.
KW - Acoustic emission
KW - Crack growth
KW - Fatigue
KW - Steel
KW - Stress intensity factor
KW - Structural health monitoring
UR - http://www.scopus.com/inward/record.url?scp=79956222291&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79956222291&partnerID=8YFLogxK
U2 - 10.1117/12.880782
DO - 10.1117/12.880782
M3 - Conference contribution
AN - SCOPUS:79956222291
SN - 9780819485465
VL - 7984
BT - Proceedings of SPIE - The International Society for Optical Engineering
ER -