On the Analysis and Design of the End Notched Flexure (ENF) Specimen for Mode II Testing

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  • L.A. Carlsson
    Center for Composite Materials University of Delaware Newark, DE 19716
  • J.W. Gillespie
    Center for Composite Materials University of Delaware Newark, DE 19716
  • R.B. Pipes
    Center for Composite Materials University of Delaware Newark, DE 19716

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<jats:p> The end notched flexure (ENF) specimen is examined as a candidate for measuring interlaminar fracture toughness in skew symmetric loading. A simple design study for sizing the ENF specimen to minimize geometric nonlinear response and to avoid nonlinear material behavior or flexural failure is presented. Results indicate that inter laminar shear effects may be significant for tough resin systems requiring large thickness-to-length geometries. The influences of interlaminar shear deformation and fric tion between the crack surfaces on the strain energy release rate are examined. </jats:p>

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