ASTM D7905 / D7905M - 14

    Standard Test Method for Determination of the Mode II Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites

    Active Standard ASTM D7905 / D7905M | Developed by Subcommittee: D30.06

    Book of Standards Volume: 15.03


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    Significance and Use

    5.1 Susceptibility to delamination is one of the major design concerns for many advanced laminated composite structures. Knowledge of a laminated composite material’s resistance to interlaminar fracture is useful for product development and material selection. Furthermore, a measurement of the mode II interlaminar fracture toughness that is independent of specimen geometry or method of force introduction is useful for establishing design allowables used in damage tolerance analyses of composite structures. Knowledge of both the non-precracked and precracked toughnesses allows the appropriate value to be used for the application of interest.

    5.2 This test method can serve the following purposes:

    5.2.1 To establish quantitatively the effect of fiber surface treatment, local variations in fiber volume fraction, and processing and environmental variables on GIIc of a particular composite material;

    5.2.2 To compare quantitatively the relative values of GIIc for composite materials with different constituents;

    5.2.3 To compare quantitatively the values of GIIc obtained from different batches of a specific composite material, for example, to use as a material screening criterion or to develop a design allowable; and

    5.2.4 To develop delamination failure criteria for composite damage tolerance and durability analyses.

    1. Scope

    1.1 This test method describes the determination of the mode II interlaminar fracture toughness, GIIc, of unidirectional fiber-reinforced polymer matrix composite laminates under mode II shear loading using the end-notched flexure (ENF) test (Fig. 1).

    1.2 This method is limited to use with composites consisting of unidirectional carbon-fiber- and glass-fiber-reinforced laminates. This limited scope reflects the experience gained in round robin testing. This test method may prove useful for other types and classes of composite materials; however, certain interferences have been noted (see Section 6).

    1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

    1.3.1 Within the text the inch-pound units are shown in brackets.

    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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement

    D883 Terminology Relating to Plastics

    D2584 Test Method for Ignition Loss of Cured Reinforced Resins

    D2734 Test Methods for Void Content of Reinforced Plastics

    D3171 Test Methods for Constituent Content of Composite Materials

    D3878 Terminology for Composite Materials

    D5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials

    D5687/D5687M Guide for Preparation of Flat Composite Panels with Processing Guidelines for Specimen Preparation

    D7264/D7264M Test Method for Flexural Properties of Polymer Matrix Composite Materials

    E4 Practices for Force Verification of Testing Machines

    E6 Terminology Relating to Methods of Mechanical Testing

    E18 Test Methods for Rockwell Hardness of Metallic Materials

    E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E456 Terminology Relating to Quality and Statistics

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    E1309 Guide for Identification of Fiber-Reinforced Polymer-Matrix Composite Materials in Databases

    E1434 Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases

    E1471 Guide for Identification of Fibers, Fillers, and Core Materials in Computerized Material Property Databases


    ICS Code

    ICS Number Code 83.080.01 (Plastics in general)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D7905_D7905M-14

    Citation Format

    ASTM D7905 / D7905M-14, Standard Test Method for Determination of the Mode II Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites, ASTM International, West Conshohocken, PA, 2014, www.astm.org

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