ISO 3377-2-2016 pdf free.Leather一Physical and mechanical tests一Determination of tear load – Part 2: Double edge tear.
This part of Is0 3377 specifies a method for determining the tear strength of leather using a double edged tear. The method is sometimes described as the Baumann tear. It is applicable to all types of leather.
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 2418, Leather一Chemical, physical and mechanical and fastness tests一Sampling location
ISO 2419, Leather一Physical and mechanical tests一Sample preparation and conditioning
ISO 2589, Leather一Physical and mechanical tests一Determination of thickness
ISO 7500-1, Metallic materials 一Verification of static uniaxial testing machines 一Part 1:Tension/compression testing machines – Verification and calibration of the force-measuring system
3 Principle
A rectangular test piece with a hole of specified shape is placed over the turned up ends of a pair of holders attached to the jaws of a tensile testing machine. The highest force exerted during tearing of the test piece is recorded.
4 Apparatus
4.1 Tensile testing machine, with:
-a force range appropriate to the specimen under test;
-a means of recording the force to an accuracy of at least 2 % as specified by Class 2 of ISO 7500-1;
– a uniform speed of separation of the jaws of 100 mm/min土20 mm/min.
4.2 Test piece holders, such as shown in Figure 1, each consisting of a strip of steel 10 mm 0,1 mm wide and 2 mm土0,1 mm thick, bent through a right angle at one end to form a rigid strip with a minimum length of 12 mm土0,1 mm. The holders either fit into or replace the jaws of the tensile testing machine (4.1).
4.3 Thickness gauge, as specified in ISO 2589.
4.4 Press knife, as specified in ISO 2419, capable of cutting a test piece as shown in Figure 2 in one operation. AIll parts of the press knife shall lie in the same plane.ISO 3377-2 pdf download.