Failure of CFRP-to-steel double strap joint bonded using carbon nanotubes modified epoxy adhesive at moderately elevated temperatures

Asghar Korayem, Shu Jian Chen, Qian Hui Zhang, Chen Yang Li, Xiao Ling Zhao, Wen Hui Duan

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The bond characteristics of double strap joints between carbon fibre reinforced polymer (CFRP) laminates and steel with carbon nanotubes (CNTs) modified epoxy, under moderately elevated temperature (23-70 °C) were studied. The effect of CNTs on the failure modes, bond interface, and bond strength were presented. Results show that increasing test temperature causes transition of failure from epoxy-CFRP interface to steel-epoxy interface and to cohesive layer in the joints with neat epoxy. The cohesive failure could be avoided in the joints with CNT-epoxy. The observations from scanning electron microscopy revealed that CNTs bridge the cracks in epoxy matrix indicating a reinforcing effect. Moreover, CNT-epoxy can provide a significant increase (about two fold) of bond strengths at moderately elevated temperatures when compared with neat epoxy. It demonstrated that the incorporation of CNTs into the bond adhesive could allow better exploiting the potential of CFRP system in strengthening of steel structures at moderately elevated temperature.

Original languageEnglish
Pages (from-to)95-101
Number of pages7
JournalComposites Part B: Engineering
Volume94
DOIs
Publication statusPublished - 1 Jun 2016

Keywords

  • A. Carbon fibre
  • A. Particle-reinforcement
  • B. Interface/interphase
  • D. Mechanical testing

Cite this

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title = "Failure of CFRP-to-steel double strap joint bonded using carbon nanotubes modified epoxy adhesive at moderately elevated temperatures",
abstract = "The bond characteristics of double strap joints between carbon fibre reinforced polymer (CFRP) laminates and steel with carbon nanotubes (CNTs) modified epoxy, under moderately elevated temperature (23-70 °C) were studied. The effect of CNTs on the failure modes, bond interface, and bond strength were presented. Results show that increasing test temperature causes transition of failure from epoxy-CFRP interface to steel-epoxy interface and to cohesive layer in the joints with neat epoxy. The cohesive failure could be avoided in the joints with CNT-epoxy. The observations from scanning electron microscopy revealed that CNTs bridge the cracks in epoxy matrix indicating a reinforcing effect. Moreover, CNT-epoxy can provide a significant increase (about two fold) of bond strengths at moderately elevated temperatures when compared with neat epoxy. It demonstrated that the incorporation of CNTs into the bond adhesive could allow better exploiting the potential of CFRP system in strengthening of steel structures at moderately elevated temperature.",
keywords = "A. Carbon fibre, A. Particle-reinforcement, B. Interface/interphase, D. Mechanical testing",
author = "Asghar Korayem and Chen, {Shu Jian} and Zhang, {Qian Hui} and Li, {Chen Yang} and Zhao, {Xiao Ling} and Duan, {Wen Hui}",
year = "2016",
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doi = "10.1016/j.compositesb.2016.03.042",
language = "English",
volume = "94",
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journal = "Composites Part B: Engineering",
issn = "1359-8368",
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Failure of CFRP-to-steel double strap joint bonded using carbon nanotubes modified epoxy adhesive at moderately elevated temperatures. / Korayem, Asghar; Chen, Shu Jian; Zhang, Qian Hui; Li, Chen Yang; Zhao, Xiao Ling; Duan, Wen Hui.

In: Composites Part B: Engineering, Vol. 94, 01.06.2016, p. 95-101.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Korayem, Asghar

AU - Chen, Shu Jian

AU - Zhang, Qian Hui

AU - Li, Chen Yang

AU - Zhao, Xiao Ling

AU - Duan, Wen Hui

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AB - The bond characteristics of double strap joints between carbon fibre reinforced polymer (CFRP) laminates and steel with carbon nanotubes (CNTs) modified epoxy, under moderately elevated temperature (23-70 °C) were studied. The effect of CNTs on the failure modes, bond interface, and bond strength were presented. Results show that increasing test temperature causes transition of failure from epoxy-CFRP interface to steel-epoxy interface and to cohesive layer in the joints with neat epoxy. The cohesive failure could be avoided in the joints with CNT-epoxy. The observations from scanning electron microscopy revealed that CNTs bridge the cracks in epoxy matrix indicating a reinforcing effect. Moreover, CNT-epoxy can provide a significant increase (about two fold) of bond strengths at moderately elevated temperatures when compared with neat epoxy. It demonstrated that the incorporation of CNTs into the bond adhesive could allow better exploiting the potential of CFRP system in strengthening of steel structures at moderately elevated temperature.

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