Tear test of Fabric by trapezoid method to ASTM D ASTM D covers the measurement of the tearing strength of textile fabrics by the trapezoid tear test using a constant-rate-of-extension-type (CRE) tensile. ASTM D Tearing Strength of Fabric by. Trapezoid Procedure. • Scope - this test method describes the determination of the tearing strength of fabrics by the.

ASTM D Tearing Strength Fabrics by Trapezoid Procedure - Instron

Historical Version s - e5587 previous versions of standard. As a minimum, use the samples for such a comparative test that are as homogeneous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing. Randomly assign the samples in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series.

Tear Strength of Fabrics - Trapezoid Procedure

If bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.

It is useful for estimating the relative tear resistance of different fabrics or different directions in the same fabric. The highest peaks appear to reflect the strength of the yarn components, individually or in combination, needed to stop a tear in fabrics of the same construction.

The valleys recorded between the peaks have no specific significance. The minimum tearing force, however, is indicated to be above the lowest valleys.

Some modification of clamping techniques may be necessary for a given fabric, depending upon its structure. Strong fabrics or fabrics made from glass fibers require special adaptation s5587 prevent them from slipping in the clamps or being damaged as a result of being gripped in the clamps. In some cases, due to fabric constructions, individual yarns may not rupture but show a high peak and yarn distortion within the test specimen.

Wherever possible, this shall be prevented. If you have tried all of these steps and yarn distortion still occurs, this must be included in the report.

This test method allows the use of the CRT-type tensile machine when agreed upon between the purchaser and the supplier. There may be no overall correlation, however, between the results obtained with the CRT-type machine and the CRE-type machine. Consequently, these aetm tensile testers cannot be used interchangeably unless the degree of quantitative correlation has been established between the purchaser and the supplier.

In any event, the CRE-type machine shall prevail. It is recognized that some constant-rate-of-traverse-type CRT tensile testing machines continue to be used. Consequently, these test instruments may be used when agreed upon between the purchaser and the supplier.

ASTM D5587 Tearing Strength of Fabrics by Trapezoid Procedure

The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated. Instructions are provided for testing specimens with or without wetting.

The reported value obtained is not directly related to the force required d557 initiate or start a tear. The values stated in inch-pound units may be approximate.

ASTM D - tearing strength of fabrics by the trapezoid procedure

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

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