Improvement in bond behavior and thermal properties of carbon fiber-reinforced polymer strengthened steel structures

Muye Yang, Jiajing Xie, Shigenobu Kainuma, Weijie Liu

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

This study focused on the bond strength and environmental durability of carbon fiber-reinforced polymer (CFRP)-strengthened steel structures, by investigating the improvements in the surface treatment of the steel substrate, thermal properties of the epoxy resin, and curing process of the composite. The results showed that the steel–adhesive interfacial bonding behavior can be improved by increasing the surface roughness and using a low-viscosity primer to enhance the wettability. During the initial curing, a lower ambient temperature during the gel time can reduce the porosity of the multi-CFRP laminate. However, raising the initial curing temperature is advantageous for the mechanical and thermal properties of the composite. In addition, the thermal properties of the epoxy matrix were clarified by differential scanning calorimetry tests, based on which isothermal curing degree curves of the system were drawn. The results demonstrated that post-curing at 80 °C is vital for increasing the glass transition temperature, which is also appropriated for the primer. Finally, the moisture and thermal effects on the deterioration of the adhesive joint were examined by conducting short-period aging tests in immersion and wet–dry cyclic environments, during which delamination strength reduction and failure mode transformation were observed.

本文言語英語
論文番号114704
ジャーナルComposite Structures
278
DOI
出版ステータス出版済み - 12月 15 2021

!!!All Science Journal Classification (ASJC) codes

  • セラミックおよび複合材料
  • 土木構造工学

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