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    ASTM D4964

    Standard Testing of Tension and Elongation of Elastic Fabrics (Elastomers)

    ASTM-D4964 Tensile Band Clamp Fixture
    Tensile Loop Band Clamp Grips
    Universal Testing Machine for ASTM C297 tensile testing
    elongation recovery curve.png
    Theory:
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    ASTM D4964 involves comprehension of the equation L = (E X C) / 200

     

    Where:

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    E is % elongation

    C is loop circumference

    L = extension;

     

    ( or Length, or Mathematical Difference from origin.)

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    This equation is derived and therefore predicated upon the mutal understandings

     

    a. loop tension is defined as the total tension at any specified extension that is exerted on a specimen in a loop formation,

     

    and

     

    b. elongation is understood as the ratio of the extension of a material to the length of the material prior to stretching.

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    Geometry:

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    To test the equation appropriately, one may rely on universal grip co band clamp attached to universal testing machine with appropriate executable software pre-installed:

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    Recommended is 

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    constant rate of extension tensile test machnie. 

    ie. band clamps, and elastomer speciemen

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    For "Thin" test subjects it is recommended to cut 5 plus specimens of the intended elastomer example.

     

     

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    Solution:

    Simple solution finding here, as we follow equation L = (E X C) / 200 and plot on a pre-programmed CRE-type tensile testing machine (a UTM.) 

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    l = (e x c) / 200

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    remember elongation as L, distance from 0. and t time in seconds to develop a graph like

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    We test elongation at desired specifications 30%, 50%, and 70%. Generally we test each spec. 3 times.

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    Analysis:

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    Because we have a "defined" loop specimen , ASTM D4964 therefore covers any elastomer found in nature.  However, recommended is prepared specimens to comprise data friendly laboratory experimentation.
     
    Laboratory Experimentation Video to come!
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    Similar Specifications:

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    "SimSpecs" may involve a global study of elastomers, aforementioned Youn'gs Modulous from physics and Also definitly read the following ASTM  on wet paper shearing.

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    https://www.universalgripco.com/astm-d378

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