Advanced Composite Materials

The Korean Society for Composite Materials (한국복합재료학회)
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Effect of the Hole on the Tensile Fatigue Properties of CFRP Laminates

  • Lee, Yeon-Soo (School of Information and Mechatronics, Gwangju Institute of Science and Technology) ;
  • Ben, Goichi (Department of Mechanical Engineering, College of Industrial Technology, Nihon University) ;
  • Lee, Se-Hwan (The 1st PGM R&D Center, Agency for Defense Development)
  • Received : 2008.06.03
  • Accepted : 2008.07.29
  • Published : 2009.03.01
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Abstract

The current study assessed the effect of a bolt hole on tensile fatigue properties of CFRP laminates. Two specimens, i.e. $[(0/90)_3]S$, $[(0/45/90/-45)_2]_S$, were analyzed using a finite element method and were experimentally tested for cases, both with and without a hole, whose diameter corresponded to 0.12 times the specimen width. Delamination positions predicted by a 3-dimensional static finite element analysis were matched well to those observed by an ultrasonic imaging system in the middle of fatigue test. A hole whose diameter corresponds to 0.12 times the specimen width caused the fatigue strength to decrease by 9% and 11% under 5 Hz loading frequency, and by 22% and 25% under 10 Hz loading frequency for $[(0/90)_3]_S$ and $[(0/45/90/-45)_2]_S$, respectively. Because the decrease in sectional area due to the hole was normalized in calculation of the tensile strength, a stress concentration around the hole is believed to induce the strength degradation of fatigue specimens. From the finite element analyses, the stress concentration factor around a hole was expected as 8.8 and 9.5 for $[(0/90)_3]_S$ and $[(0/45/90/-45)_2]_S$, respectively.

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References

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