ASTM WK22949

    New Test Method for Determination of the Mode II Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites Using the End-Notched Flexure (ENF) Test

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    Developed by Subcommittee: D30.06 | Committee D30 | Contact Staff Manager


    1. Scope

    1.1 This test method describes the determination of the Mode II interlaminar fracture toughness, GIIc, of unidirectional fiber-reinforced polymer laminates under Mode II shear loading using the end-notched flexure (ENF) test. 1.2 This test method is applicable to unidirectional carbon-fiber and glass-fiber-reinforced laminates. The scope is not necessarily limited to these fibers and lay-ups, but recommendations for other types of fibers or lay-ups are not presented, meaning that testing has only been performed on these laminates and lay-ups. This test method may prove useful for laminates with other types of fibers and lay-ups. 1.3 The values given in SI units are to be regarded as the standard. Those units in parentheses are for reference only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    composite materials; delamination; end-notched flexure; ENF; interlaminar fracture toughness; Mode II; in-plane shear


    Standardized interlaminar fracture toughness tests exist for Mode I (DCB) and mixed-mode (MMB) but not Mode II. This test will be used by industry and government for qualitatively comparing composite materials as well as for determining values to be used in design, analysis, and acceptance/rejection criteria.

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    Work Item Status

    Date Initiated:

    Technical Contact:
    Barry Davidson