The ENF Test: Critical Analysis and Computational Modelling

by William E. Bachrach, Columbia Univ, United States,
Daniel N. Beshers, Columbia Univ, United States,

Document Type: Proceeding Paper

Part of: Serviceability and Durability of Construction Materials


We have developed an experimental and computational strategy to moderate the experimental scatter of the interlaminar fracture toughness values (GIIc) in the End Notched Flexure (ENF) test. Previously, we introduced a modified ENF test which produces more data per specimen, while allowing for sample variation, and hence reducing the scatter. The refined data are used in the comparison of two computational models (structural and finite element) to compute GIIc. For a brittle, transversely isotropic material, 32 ply unidirectional laminate of variable thickness, we compared the deflections and GIIc values of these two models, and these models are found to agree well with each other.

Subject Headings: Computer models | Material tests | Laminated materials | Mathematical models | Material failures | Material mechanics | Finite element method

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