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Experimental Study on Interfacial Bond Behavior between CFRP Sheets and Steel Plates under Fatigue Loading.

Long Zhang1, Shuangyin Cao2, Xin Tao3

  • 1Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China. 230129147@seu.edu.cn.

Materials (Basel, Switzerland)
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Summary

This study investigates carbon fiber reinforced polymer (CFRP) bonded to steel interfaces under fatigue. Results show crack growth accelerates with higher stress, leading to reduced fatigue life and debonding failure.

Keywords:
carbon fiber-reinforced polymerfatigue crackfatigue lifeinterfacesteel

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Area of Science:

  • Materials Science
  • Structural Engineering
  • Mechanical Engineering

Background:

  • Carbon fiber reinforced polymer (CFRP) composites are crucial for enhancing steel structure fatigue behavior.
  • The CFRP-to-steel bonded interface's fatigue performance is critical for the overall strengthening effect.
  • Understanding interfacial behavior under fatigue is essential for reliable structural reinforcement.

Purpose of the Study:

  • To investigate the interfacial bond behavior of CFRP-to-steel joints under fatigue loading.
  • To analyze the effects of stress ratio and stress level on crack development and fatigue life.
  • To develop a calculation model for crack development and propose an empirical S-N curve formula.

Main Methods:

  • Experimental testing of CFRP-to-steel double-shear specimens under fatigue loading.
  • Systematic variation of upper and lower bound fatigue loading parameters.
  • Analysis of crack propagation rates and fatigue life data.
  • Development of a crack growth calculation model and an empirical S-N curve.

Main Results:

  • Crack development rate increases with higher stress ratio and stress level.
  • The crack development process exhibits two distinct phases: stable growth and debonding failure.
  • Fatigue life of the specimens decreases significantly as the stress level increases.
  • A calculation model for crack development rate and an empirical S-N curve formula were established.

Conclusions:

  • The fatigue behavior of CFRP-to-steel bonded interfaces is characterized by stress-dependent crack growth and eventual debonding.
  • The proposed calculation model and empirical S-N curve provide valuable tools for predicting the fatigue performance of these composite-to-steel joints.
  • CFRP strengthening of steel structures requires careful consideration of interfacial fatigue behavior to ensure long-term durability and performance.