BS EN ISO 3376:2020 pdf free
BS EN ISO 3376:2020 pdf free.Leather – Physical and mechanical tests一Determination of tensile strength and percentage elongation.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2418, Leather — Chemical, physical and mechanical and fastness tests — Sampling location
ISO 2419, Leather — Physical and mechanical tests — Sample preparation and conditioning
ISO 2589, Leather — Physical and mechanical tests — Determination of thickness
ISO 7500-1, Metallic materials — Calibration and verification of St atic uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— I EC Electropedia. available at http://www.electropedia.org/
4 Principle
A test piece is extended at a specified rate until the forces reach a predetermined value or until the test piece breaks.
5 Apparatus
5.1 Tensile testing machine, with:
a) a force range appropriate to the specimen under test;
b) a means of recording the force to an accuracy of at least 2 % as specified by Class 2 of ISO 7500-1;
c) a uniform speed of separation of the jaws of 100 mm/mm ± 20 mm/mm;
d) a means of recording the force, for example as an elongation curve;
e) jaws, minimum length of 45 mm in the direction of the applied load, designed to apply constant clamping by mechanical or pneumatic means. The texture and design of the inside faces of the jaws shall be such that, at the maximum load attained in the test, the specimen does not slip in either jaw by an amount exceeding 1 % of the original jaw separation.
5.2 A means of determining the elongation of the test piece, either by monitoring the separation of the jaws or by sensors which monitor the separation of two fixed points on the test piece.
5.3 Thickness gauge, as specified in ISO 2589.
5.4 Press knives, as specified in ISO 2419, capable of cutting a standard or large size test piece as shown in Figure 1 to the dimensions given in Table 1.BS EN ISO 3376 pdf download.
