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    NIKE G077 Tear Resistance R7

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    Nhu Yen

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    NIKE G077 Tear Resistance R7

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    Nhu Yen
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    19 views4 pages

    NIKE G077 Tear Resistance R7

    Uploaded by

    Nhu Yen

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    © All Rights Reserved
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    7/23/2018 Rev 7

    NIKE G077 – TEAR RESISTANCE BY THE TONGUE METHOD

    1. OVERVIEW
    The purpose of the test is to determine the tear strength for textile, synthetic leather and non-
    woven materials by the tongue method using a tensile test machine and the tear strength of
    leather and composition leather by measuring the force required to tear a specimen cut
    perpendicular to the surface.

    2. REVISION HISTORY
    Revision # Date Author Reason
    0 10/27/02 Yew T Initial Method
    Update method to clarify how to report results when
    1 Yew T
    11/24/04 a material does not tear in a straight line.
    Nancy Felten and Addition of sample size and change in sample
    2
    10/11/06 Taryn Hensley dimension
    Revision of document name from “Tongue Tear
    Taryn Hensley and Test” to “Tear Resistance by the Tongue Method”.
    3 9/4/07
    Nancy Felten Remove Webbing, Plastic, Rubber, Foam, Threads
    and Laces from Table in section 5.3.
    4 7/17/08 Ed Wachtel New leather sampling
    5 12/17/11 Qi Liu New Knit samples
    6 4/17/2012 Qi Liu Move Knit sample to NIKE G100
    7 3/10/2017 Dave Horspool Addition of Composition Leather

    3. SAMPLE SIZE
    For textiles, synthetic leather and composition leather, the minimum sample size for tongue
    tear testing is 12, 3 each in 2 directions (A&B) and 2 orientations (1&2).
    For leathers the minimum sample size for tongue tear testing is 6, 2 orientations (A&B) by 3
    hides.

    4. SPECIMEN PREPARATION
    4.1 For Textile, Synthetic leather and non-woven materials
    Die cut 12 rectangular specimens 7.62 x 15 cm (3 x 6 inch) from each yard of fabric. Cut
    6 specimens for measurement of the tear strength of warp yarns in the “A” direction
    (machine direction) and 6 specimens for measurement of the tear strength of filling yarns
    in the “B” direction (cross direction). Make a 7.62 cm (3 in) cut in the long end of each
    specimen as shown in Figure 1. Label specimens as A1a, A1b, A1c, A2a, A2b, A2c,
    B1a, B1b, B1c and B2a, B2b, B2c. Then mark five successive 12-mm portions starting at
    5-mm past the initial cut line as shown in Figure 2.

    4.2 For Leather material


    Die cut 2 rectangular pieces of leather 2.54 x10.16 cm (1x4 inch) (A & B) from the ISO
    2418 sampling area from each of the three hides. It shall have a 0.476 cm (3/16 inch)
    diameter hole located on the long axis 2.54 cm (1 inch) from one end and shall be split

    NIKE G077 Tear Resistance R7.docx Nike Confidential Page 1 of 4


    7/23/2018 Rev 7

    along its axis from the hole to the other end to form two tongues. See Figure 3. Cutting
    pattern is similar to Figure 1 but there are just A and B direction, not A1/A2 or B1/B2.

    4.3 For Composition Leather material


    Using the leather tongue tear die (described in section 4.2 above), cut 6 specimens in A
    (machine) direction: cut 3 samples and label specimens as A1a, A1b, A1c, and cut 3 samples
    180 degrees to A1 direction and mark as A2a, A2b, A2c. Then die cut 6 specimens in B
    (cross) direction, using the same method and mark as B1a-c, and B2a-c.

    5. TEST EQUIPMENT
    5.1 For Textile, Synthetic leather and non-woven materials
    Set the nominal gage length at 75 mm and use a crosshead speed of 300 mm/min. Then
    place the specimen in the clamps so that the slit is centered in the jaws. Each tongue is
    held in a clamp in such a manner that the originally adjacent cut edges of the tongues
    form a straight line joining the centers of the clamps and the two tongues present opposite
    faces of the fabric to the tester. Use a knife to cut the tear if the material does not tear in a
    straight line and discard those cutting values.

    5.2 For Leather material and Composition Leather Material


    Clamp one of the tongues on the specimen in each of the testing grips so that the long
    axis of the tongue is in the direction of the motion of the movable grip. The faces of the
    grips shall be approximately 50.8 mm (2 inch) from the common base of the tongues
    (from the hole). Use a crosshead speed of 300 mm/min. Operate until the specimen starts
    to tear.

    5.3 Grip Faces

    Material to be Tested Grip Face Type


    Leather, Synthetic Leather, Composition Rubber coated, flat face
    Leather, Textile, Package Materials, grips
    Knitted mesh structure

    6 DATA COLLECTION & ANALYSIS


    6.1 For Textile, Synthetic leather and non-woven materials
    Record the highest load value from each 12 mm section of each specimen. This results in
    5 load values for each specimen (A1a, A1b, A1c, etc.). Calculate the average tear load
    for each specimen (average of 5 load values).

    If the material does not tear in the direction we are testing, a knife can be used to help
    initiate tearing in the test direction. In some cases, the material may be weaker in the
    cross direction and may not tear in the test direction even if a knife is used. If the
    material fails to tear in the test direction, report the value, but note the behavior in the
    notes section.

    6.2 For Leather material and Composition Leather

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    7/23/2018 Rev 7

    Record and report the initial tear strength as the result. Report the tear loads for both A
    and B directions.

    7 REFERENCE
    7.1 ASTM D 2261-83 Standard Test Method for Tearing Strength of Woven Fabrics by the
    Tongue (Single Rip) Method (Constant-Rate-of-Extension Tensile Testing Machine)
    7.2 ASTM D 4704-93 Standard Test Method for Tearing Strength, Tongue Tear of Leather.
    7.3 Nike Test Method G054: Leather Sampling

    MACHINE DIRECTION

    A2
    A DIRECTION

    A1

    B1 B2

    Figure 1 – Cutting Pattern for Tongue Tear Specimens

    5 mm

    12 mm 12 mm 12 mm 12 mm 12 mm

    Figure 2 – Marking of Each Tongue Tear Specimen


    Bold line is the 7.62 cm (3 in) initial cut line
    Mark 5 successive 12 mm sections on fabric starting 5 mm after the
    initial cut line

    Diameter of Hole is
    4.76mm (3/16inch)

    NIKE G077 Tear Resistance R7.docx Nike Confidential Page 3 of 4


    7/23/2018 Rev 7

    |-----1inch-------|

    Figure 3 – Marking of Each Tongue Tear Specimen

    NIKE G077 Tear Resistance R7.docx Nike Confidential Page 4 of 4

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