GB/T 3917.3-2025Textiles - Tear properties of fabrics - Part 3: Determination of tear force of trapezoid-shaped test specimens (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020

Directives for standardization - Part 1.Rules for the structure and drafting of

standardizing documents.

This document is Part 3 of GB/T 3917 Textiles - Tear properties of fabrics. The

following parts of GB/T 3917 have been published.

-- Part 1.Determination of tear force using ballistic pendulum method (Elmendorf);

-- Part 2.Determination of tear force of trouser-shaped test specimens (Single tear

method);

-- Part 3.Determination of tear force of trapezoid-shaped test specimens;

-- Part 4.Determination of tear force of tongue-shaped test specimens (Double tear

test);

-- Part 5.Determination of tear force of wing-shaped test specimens (Single tear

method).

This document replaces GB/T 3917.3-2009 Textiles - Tear properties of fabrics - Part

3 Determination of tear force of trapezoid-shaped test specimens. Compared with

GB/T 3917.3-2009, in addition to structural adjustments and editorial changes, the main

technical changes are as follows.

-- The scope of application of the standard is modified (see Chapter 1; see Chapter

1 of the 2009 edition);

-- The term "constant rate of traverse testing machine" is added, and the term

"length of tear" is deleted (see 3.2; see 3.5 of the 2009 edition);

-- The test principle for nonwoven fabrics is added, and the description of the test

principle for woven fabrics is improved (see Chapter 4);

-- The features that the testing machine and clamp shall have are added (see 5.1

and 5.2);

-- The apparatus and consumables required for testing wet test specimens are added

(see 5.4, 5.5, 5.6, and 5.7);

-- The sample preparation for wet test is added (see 7.3 and 7.4);

Textiles - Tear properties of fabrics - Part 3.Determination

of tear force of trapezoid-shaped test specimens

1 Scope

This document describes the determination of the tear force of fabrics by using the

trapezoid-shaped test specimen method.

This document applies to woven fabrics (except woven elastic fabrics) and nonwovens.

2 Normative references

The provisions of the following documents constitute the essential clauses of this

document through normative references in this text. Among them, for referenced

documents with dates, only the versions corresponding to the dates are applicable to

this document; for referenced documents without dates, the latest versions (including

all amendments) are applicable to this document.

GB/T 6529 Textiles - Standard atmospheres for conditioning and testing (GB/T

6529-2008, ISO 139.2005, MOD)

GB/T 6682 Water for analytical laboratory use - Specification and test methods

(GB/T 6682-2008, ISO 3696.1987, MOD)

GB/T 16825.1-2022 Metallic materials - Calibration and verification of static

uniaxial testing machines – Part 1.Tension/compression testing machines -

Calibration and verification of the force-measuring system (ISO 7500-1.2018, IDT)

GB/T 19022 Measurement management systems - Requirements for measurement

processes and measuring equipment (GB/T 19022-2003, ISO 10012.2003, IDT)

3 Terms and definitions

The following terms and definitions apply to this document.

The URLs for terminology databases used for standardization, maintained by ISO and

IEC, are as follows.

4 Principle

A trapezoid is drawn on the test specimen and a specified notch is cut in the center of

the short side of the trapezoid. The clamps of the constant rate of extension testing

machine (CRE) are used to clamp the two non-parallel sides of the trapezoid. A

continuously increasing force is applied to the test specimen to make the tear propagate

along the width direction of the test specimen. The force of continuous tearing over the

specified distance is recorded. For woven fabrics, the arithmetic mean of the effective

peak average values of all test specimens in one direction is the test result. For

nonwoven fabrics, the arithmetic mean of the maximum force values of all test

specimens in one direction is the test result, and the unit is Newton (N).

5 Apparatus and materials

2022 At any point within the full range of the instrument, the error of the

indicated or recorded maximum tear force shall not exceed ±1%, and the error

of the indicated or recorded clamp spacing shall not exceed ±1 mm.

e) If the force and extension records are obtained through a data acquisition board

and software, the data acquisition frequency shall be at least 8 times/second.

If the test instrument used meets the Level 2 requirements of GB/T 16825.1-2022, this

shall be noted in the report.

NOTE. When agreed between the parties concerned, a constant rate of traverse testing machine (3.2)

may also be used. The results of tests using a CRT (constant rate of traverse) machine and a CRE (constant

rate of extension) machine are not comparable.