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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