Journal of Materials Science

, Volume 26, Issue 24, pp 6553–6564 | Cite as

Fracture toughness evaluation for short glass fibre reinforced composites

  • C. L. Chow
  • T. J. Lu
Papers

Abstract

Valid plane-stress fracture toughness evaluation of short fibre reinforced composites relies essentially on the successful separation of the energy absorbed in the localized crack-tip region out of the total energy absorbed by the cracked material body at large. Three different experimental techniques, all stemming from the energetic interpretation of theJ integral, are utilized and their relative merits in the characterization of fracture initiation in short glass fibre reinforced injection-moulded nylon 6.6 examined. Various theoretical aspects concerning these experimental methods are outlined. The rationale behind using a single-edge-notched tension type specimen for theJc test is presented. TheJc value obtained from the compliance calibration method and the quasistatic energy method agree closely and can be considered to be independent of pre-crack length and specimen geometry when the pre-crack length to specimen width ratio (a/w) is larger than 0.45. The extrapolation method fails nevertheless to yield a physically consistentJc value, possibly due to its questionable theoretical representation. As no constraint on boundary conditions is necessitated during the course of crack extension, the quasistatic energy is physically more appealing.

Keywords

Fracture Toughness Crack Extension Fracture Initiation Short Fibre Specimen Width 

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Copyright information

© Chapman & Hall 1991

Authors and Affiliations

  • C. L. Chow
    • 1
  • T. J. Lu
    • 1
  1. 1.Department of Mechanical EngineeringSouthern Illinois University at EdwardsvilleEdwardsvilleUSA

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