Study on thermal effects on fatigue behavior of cracked steel plates strengthened by CFRP sheets

Peng Feng; Lili Hu; Xiao Ling Zhao; Lu Cheng; Shanhua Xu

doi:10.1016/j.tws.2014.04.015

Study on thermal effects on fatigue behavior of cracked steel plates strengthened by CFRP sheets

Peng Feng, Lili Hu, Xiao Ling Zhao, Lu Cheng, Shanhua Xu

Research output: Journal article publication › Journal article › Academic research › peer-review

69 Citations (Scopus)

Abstract

Carbon fiber reinforced polymer (CFRP) sheets have been used to strengthen steel structures to enhance fatigue life. However there is very limited information on the influence of temperatures on the fatigue strengthening efficiency. This paper describes an investigation on the behavior of cracked steel plates strengthened with CFRP at different temperatures. Firstly, through cylinder coupon tests, mechanical properties of the resin were found to vary at different temperatures, especially when the temperature exceeds the glass transition temperature T_g. Secondly, three cracked bare steel plates and five cracked steel plates strengthened with high modulus CFRP sheets were tested under fatigue loading at different temperatures. The results prove the effectiveness of CFRP strengthening technology to increase fatigue life when the temperature ranges from -40 °C up to 60 °C. It is concluded that the variation of temperature has an obvious influence on properties of the resin, leading to influence on fatigue life. Finally, the existing analytical method to predict fatigue lives of CFRP strengthened steel plates at ambient temperature was modified by considering the temperature effect. Experimental and theoretical results are compared and reasonable agreement is achieved. The influence of the number of CFRP layers and CFRP modulus is also found based on the proposed analytical method.

Original language	English
Pages (from-to)	311-320
Number of pages	10
Journal	Thin-Walled Structures
Volume	82
DOIs	https://doi.org/10.1016/j.tws.2014.04.015
Publication status	Published - Sept 2014
Externally published	Yes

Keywords

Fatigue life
Fiber reinforced polymer
Resin
Structural strengthening
Temperature

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Mechanical Engineering

More information

10.1016/j.tws.2014.04.015

Cite this

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title = "Study on thermal effects on fatigue behavior of cracked steel plates strengthened by CFRP sheets",

abstract = "Carbon fiber reinforced polymer (CFRP) sheets have been used to strengthen steel structures to enhance fatigue life. However there is very limited information on the influence of temperatures on the fatigue strengthening efficiency. This paper describes an investigation on the behavior of cracked steel plates strengthened with CFRP at different temperatures. Firstly, through cylinder coupon tests, mechanical properties of the resin were found to vary at different temperatures, especially when the temperature exceeds the glass transition temperature Tg. Secondly, three cracked bare steel plates and five cracked steel plates strengthened with high modulus CFRP sheets were tested under fatigue loading at different temperatures. The results prove the effectiveness of CFRP strengthening technology to increase fatigue life when the temperature ranges from -40 °C up to 60 °C. It is concluded that the variation of temperature has an obvious influence on properties of the resin, leading to influence on fatigue life. Finally, the existing analytical method to predict fatigue lives of CFRP strengthened steel plates at ambient temperature was modified by considering the temperature effect. Experimental and theoretical results are compared and reasonable agreement is achieved. The influence of the number of CFRP layers and CFRP modulus is also found based on the proposed analytical method.",

keywords = "Fatigue life, Fiber reinforced polymer, Resin, Structural strengthening, Temperature",

author = "Peng Feng and Lili Hu and Zhao, {Xiao Ling} and Lu Cheng and Shanhua Xu",

note = "Funding Information: This research was supported by the National Basic Research Program of China (973 Program, 2012CB026200 ) and the National High Technology Research and Development Program (863 Program, 2012AA03A204 ). The first authors gratefully acknowledge the support of the Beijing Higher Education Young Elite Teacher Project ( YETP0078 ).",

year = "2014",

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doi = "10.1016/j.tws.2014.04.015",

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T1 - Study on thermal effects on fatigue behavior of cracked steel plates strengthened by CFRP sheets

AU - Feng, Peng

AU - Hu, Lili

AU - Zhao, Xiao Ling

AU - Cheng, Lu

AU - Xu, Shanhua

N1 - Funding Information: This research was supported by the National Basic Research Program of China (973 Program, 2012CB026200 ) and the National High Technology Research and Development Program (863 Program, 2012AA03A204 ). The first authors gratefully acknowledge the support of the Beijing Higher Education Young Elite Teacher Project ( YETP0078 ).

PY - 2014/9

Y1 - 2014/9

N2 - Carbon fiber reinforced polymer (CFRP) sheets have been used to strengthen steel structures to enhance fatigue life. However there is very limited information on the influence of temperatures on the fatigue strengthening efficiency. This paper describes an investigation on the behavior of cracked steel plates strengthened with CFRP at different temperatures. Firstly, through cylinder coupon tests, mechanical properties of the resin were found to vary at different temperatures, especially when the temperature exceeds the glass transition temperature Tg. Secondly, three cracked bare steel plates and five cracked steel plates strengthened with high modulus CFRP sheets were tested under fatigue loading at different temperatures. The results prove the effectiveness of CFRP strengthening technology to increase fatigue life when the temperature ranges from -40 °C up to 60 °C. It is concluded that the variation of temperature has an obvious influence on properties of the resin, leading to influence on fatigue life. Finally, the existing analytical method to predict fatigue lives of CFRP strengthened steel plates at ambient temperature was modified by considering the temperature effect. Experimental and theoretical results are compared and reasonable agreement is achieved. The influence of the number of CFRP layers and CFRP modulus is also found based on the proposed analytical method.

AB - Carbon fiber reinforced polymer (CFRP) sheets have been used to strengthen steel structures to enhance fatigue life. However there is very limited information on the influence of temperatures on the fatigue strengthening efficiency. This paper describes an investigation on the behavior of cracked steel plates strengthened with CFRP at different temperatures. Firstly, through cylinder coupon tests, mechanical properties of the resin were found to vary at different temperatures, especially when the temperature exceeds the glass transition temperature Tg. Secondly, three cracked bare steel plates and five cracked steel plates strengthened with high modulus CFRP sheets were tested under fatigue loading at different temperatures. The results prove the effectiveness of CFRP strengthening technology to increase fatigue life when the temperature ranges from -40 °C up to 60 °C. It is concluded that the variation of temperature has an obvious influence on properties of the resin, leading to influence on fatigue life. Finally, the existing analytical method to predict fatigue lives of CFRP strengthened steel plates at ambient temperature was modified by considering the temperature effect. Experimental and theoretical results are compared and reasonable agreement is achieved. The influence of the number of CFRP layers and CFRP modulus is also found based on the proposed analytical method.

KW - Fatigue life

KW - Fiber reinforced polymer

KW - Resin

KW - Structural strengthening

KW - Temperature

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DO - 10.1016/j.tws.2014.04.015

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Study on thermal effects on fatigue behavior of cracked steel plates strengthened by CFRP sheets

Abstract

Keywords

ASJC Scopus subject areas

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