ASTM D4964

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

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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