Details
| Original language | English |
|---|---|
| Pages (from-to) | 295-305 |
| Number of pages | 11 |
| Journal | Composite structures |
| Volume | 152 |
| Early online date | 11 May 2016 |
| Publication status | Published - 15 Sept 2016 |
| Externally published | Yes |
Abstract
The introduction of carbon fiber reinforced polymer (CFRP) with higher Young's modulus has broadened its application to the strengthening of steel structures, especially under fatigue loading. Most research on CFRP strengthening of steel under fatigue loading has focused on tension fatigue testing, assuming that cracks or crack-like defects propagate in pure tension mode. However, the complex details and welded connections in aging metallic structures may contain cracks orientated randomly with respect to the loading direction. This paper aims to extend the current knowledge of CFRP strengthening of steel elements in tensile fatigue loading to the case of mixed tension and shear loading. Steel plates were artificially cracked from a central hole at six different angles (10°-90°) with respect to the loading axis. Each crack angle represents a certain degree of mode mixity. Ultra-high modulus CFRP was used for strengthening in this study. Twelve specimens were strengthened with two CFRP patching configurations. Six unrepaired specimens were tested to act as control specimens. A shifting phenomenon was identified to describe the influence of mixed mode in terms of crack propagation. A mixed mode modification factor was developed to estimate the fatigue life of CFRP-strengthened steel plates with inclined initial cracks.
Keywords
- CFRP strengthening, Fatigue, Inclined cracks, Steel plate, Ultra-high modulus CFRP laminate
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Engineering(all)
- Civil and Structural Engineering
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In: Composite structures, Vol. 152, 15.09.2016, p. 295-305.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effect of crack orientation on fatigue behavior of CFRP-strengthened steel plates
AU - Aljabar, N. J.
AU - Zhao, X. L.
AU - Al-Mahaidi, R.
AU - Ghafoori, E.
AU - Motavalli, M.
AU - Powers, N.
N1 - Funding Information: The authors gratefully acknowledge the financial support provided by the Australian Research Council through an ARC Linkage Grant ( LP140100543 ) with VicRoads and S&P Clever Reinforcement Company AG as industry partners. Thanks are given to all technical staff in the civil engineering laboratory at Monash University, especially Mr. Long Goh and Mr. Saravan Mani for their technical support. The first author wishes to thank the Higher Committee for Education Development in Iraq for sponsoring his research at Monash University.
PY - 2016/9/15
Y1 - 2016/9/15
N2 - The introduction of carbon fiber reinforced polymer (CFRP) with higher Young's modulus has broadened its application to the strengthening of steel structures, especially under fatigue loading. Most research on CFRP strengthening of steel under fatigue loading has focused on tension fatigue testing, assuming that cracks or crack-like defects propagate in pure tension mode. However, the complex details and welded connections in aging metallic structures may contain cracks orientated randomly with respect to the loading direction. This paper aims to extend the current knowledge of CFRP strengthening of steel elements in tensile fatigue loading to the case of mixed tension and shear loading. Steel plates were artificially cracked from a central hole at six different angles (10°-90°) with respect to the loading axis. Each crack angle represents a certain degree of mode mixity. Ultra-high modulus CFRP was used for strengthening in this study. Twelve specimens were strengthened with two CFRP patching configurations. Six unrepaired specimens were tested to act as control specimens. A shifting phenomenon was identified to describe the influence of mixed mode in terms of crack propagation. A mixed mode modification factor was developed to estimate the fatigue life of CFRP-strengthened steel plates with inclined initial cracks.
AB - The introduction of carbon fiber reinforced polymer (CFRP) with higher Young's modulus has broadened its application to the strengthening of steel structures, especially under fatigue loading. Most research on CFRP strengthening of steel under fatigue loading has focused on tension fatigue testing, assuming that cracks or crack-like defects propagate in pure tension mode. However, the complex details and welded connections in aging metallic structures may contain cracks orientated randomly with respect to the loading direction. This paper aims to extend the current knowledge of CFRP strengthening of steel elements in tensile fatigue loading to the case of mixed tension and shear loading. Steel plates were artificially cracked from a central hole at six different angles (10°-90°) with respect to the loading axis. Each crack angle represents a certain degree of mode mixity. Ultra-high modulus CFRP was used for strengthening in this study. Twelve specimens were strengthened with two CFRP patching configurations. Six unrepaired specimens were tested to act as control specimens. A shifting phenomenon was identified to describe the influence of mixed mode in terms of crack propagation. A mixed mode modification factor was developed to estimate the fatigue life of CFRP-strengthened steel plates with inclined initial cracks.
KW - CFRP strengthening
KW - Fatigue
KW - Inclined cracks
KW - Steel plate
KW - Ultra-high modulus CFRP laminate
UR - http://www.scopus.com/inward/record.url?scp=84969792556&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2016.05.033
DO - 10.1016/j.compstruct.2016.05.033
M3 - Article
AN - SCOPUS:84969792556
VL - 152
SP - 295
EP - 305
JO - Composite structures
JF - Composite structures
SN - 0263-8223
ER -