Journal of Materials Science

, Volume 20, Issue 11, pp 3967–3975 | Cite as

Fracture toughness of 2-D carbon fibre reinforced carbon composites

  • H. C. Kim
  • K. J. Yoon
  • R. Pickering
  • P. J. Sherwood
Papers

Abstract

The fracture toughness of 2-D woven carbon fibre reinforced carbon laminate has been evaluated by linear elastic fracture mechanics (LEFM),R-curve andJ-integral analysis using the single edge-notched bending (SENB) specimen of edge and flatwise geometries. The edgewise specimens failed by a small extension of the self similar crack whereas the flatwise specimens failed by delamination. The surface damage developing from the tip of the initial crack was revealed by the brittle lacquer coating technique and the zone shape varied with the specimen geometry, i.e. the loading axis relative to the woven layers. Acoustic emission (AE) was also used to monitor crack growth, and the total ring down count of AE was observed to increase as the initial crack length was decreased. Both the damage zone size and total AE counts were found to increase in two linear stages as a function of the square of the stress intensity factor,K.

Keywords

Fracture Toughness Stress Intensity Factor Carbon Fibre Acoustic Emission Linear Elastic Fracture Mechanic 

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Copyright information

© Chapman and Hall Ltd. 1985

Authors and Affiliations

  • H. C. Kim
    • 1
  • K. J. Yoon
    • 2
  • R. Pickering
    • 3
  • P. J. Sherwood
    • 4
  1. 1.Physics DepartmentKorea Advanced Institute of Science and TechnologySeoulKorea
  2. 2.Korea Institute of Machinery and MetalsKyungnamKorea
  3. 3.Explosives DivisionRoyal OrdnanceWestcott, AylesburyUK
  4. 4.Admiralty Research EstablishmentPortlandUK

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