ISO 13934-2-2014 pdf free.Textiles一Tensile properties of fabrics – Part 2: Determination of maximum force using the grab method.
This part of ISO 13934 specifies a procedure for the determination of the maximum force of textile fabrics known as the grab test.
NOTE ISO 13934-1 describes the method known as the strip test.
The method is mainly applicable to woven textile fabrics including fabrics which exhibit stretch characteristics imparted by the presence of an elastomeric fibre and mechanical or chemical treatment. It can be applicable to fabrics produced by other techniques. It is not normally applicable to geotextiles, nonwovens, coated fabrics, textile-glass woven fabrics, and fabrics made from carbon fibres or polyolefin tape yarns.
The method specifies the determination of the maximum force of test specimens in equilibrium with the standard atmosphere for testing and of test specimens in the wet state.
The method is restricted to the use of constant-rate-of-extension (CRE) testing machines.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 7500-1, Metallicmateriais— Verification ofstaticuniaxialtesting machines—Part 1: Tension/compression testing machines — Verification and calibration of the force-measuring system
ISO 1001 2-1, Quality assurance requirements for measuring equipment — Part 1: Met roloqicai confirmation system for measuring equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions in ISO 13934 and the following apply.
3.1 constant-rate-of-extension (CRE) testing machine
tensile-testing machine provided with one clamp which is stationary and another clamp which moves with a constant speed throughout the test, the entire testing system being virtually free from deflection
[SOURCE: ISO 13934-1:20 13, 3.1j
3.2 grab test tensile test in which only the centre part of the test specimen is gripped in the jaws of the testing machine
4 Principle
A fabric test specimen, gripped in its centre part by jaws of specified dimensions, is extended at constant
rate until it ruptures. The maximum force is recorded.
5 Sampling
Select samples either in accordance with the procedure laid down in the material specification for the fabric or as agreed between the interested parties.
In the absence of an appropriate material specification, the example of a suitable sampling procedure given in Annex A can be used.
An example of a suitable pattern for cutting test specimens from the laboratory sample is given in Amiex.B. Avoid test specimens with folded or creased areas, selvedges, and areas not representative of the fabric.
6 Apparatus
6.1 CRE machine
The metrological confirmation system of the tensile-testing machine shall be in accordance with
ISO 10012-1.
The constant-rate-of-extension (CRE) machine shall have the general characteristics given in L1 to
6.1.1 The tensile-testing machine shall be provided with means for indicating or recording the force applied to the test specimen in stretching it to rupture. Under conditions of use, the accuracy of the apparatus shall be class 1 of ISO 7500-1. The error of the indicated or recorded maximum force at any point in the range in which the machine is used shall not exceed ±1 %.
6.1.2 If a class 2 tensile-testing machine according to ISO 7500-1 is to be used, this shall be stated in the test report.
6.1.3 If recording of force is obtained by means of data acquisition hoards and software, the frequency of data collection shall be at least eight per second.ISO 13934-2 pdf fre download.
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