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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Petroleum and Chemical Industry Association.
This standard is under the jurisdiction of Subcommittee on Rubber Footwear of National Technical Committee on Rubber & Products of Standardization Administration of China (SAC/TC35/SC9).
Determination of pull-out force of eyelets
1 Scope
This standard specifies the determination of pull-out force of eyelets pulling out from the attached material, including Method A and Method B, where Method A is conical rod push-out method, and Method B is lace pull-out method.
It is applicable to the pull-out force of eyelets of general wearing shoes (it may also be the reference for special eyelets or eyelets accessory).
2 Normative references
The following referenced documents are indispensable for the application 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.
GB/T 16825.1-2008 Verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Verification and calibration of the force-measuring system
3 Principle
3.1 Method A
Fix the upper (or other material) with eyelet on the chuck of the tensile machine. Make the conical rod pass through the eyelet from the opposite side of the upper (or other material), and apply the force continuously by the tensile machine to make the chuck and the conical rod move in same direction, until the conical rod pushes up the eyelet and the eyelet is separated from the upper (or other material) or the upper (or other material) is damaged, and record the maximum force applied during the process, which is the pull-out force of eyelet.
3.2 Method B
Clamp and fix one end of the upper with the eyelet on the fixture of the tensile machine, and fix the lace on the fixture at the other end through the eyelet, and apply force continuously by the tensile machine (the force bearing direction of the eyelet is the same as that during lacing up in daily life). Immediately stop the test when any part of the eyelet is separated from the material or the material is damaged; and record the maximum force applied during the process, which is the pull-out force of eyelet.
4 Test devices
4.1 Tension testing machine
It shall meet Grade 2 accuracy as specified in GB/T 16825.1-2008. The force range is 0N to 1,000N, the movement speed shall include 50mm/min±5mm/min and 100mm/min±5mm/min, and it is equipped with an automatic recorder or a computer with drawing software for data acquisition and processing.
4.2 Fixture
4.2.1 Method A
4.2.1.1 The fixture is as shown in Figure 1.
4.2.1.2 Conical rod: with length of 70mm±5mm, tip diameter of 3mm±0.1mm and maximum cone diameter of 10mm±0.1mm.
4.2.1.3 Chuck: two groups, each group consisting of two metal plates with holes in the middle, one with a hole diameter not less than 20mm and the other with hole diameters of 12.5mm and 16mm.
4.2.1.4 Baseplate: there shall be a circular hole with a diameter of 25mm. The center of the circular hole on the chuck and the baseplate shall directly face the center of the conical rod (a positioning device may be installed).
Key
1——Chuck
2——Baseplate
3——Support
4——Conical rod
Figure 1 Schematic diagram of fixture for pull-out force of eyelets (Method A)
4.2.2 Method B
The fixture is as shown in Figure 2. The fixture shall be able to tightly secure the upper material and the laces (the laces are taken from the test sample).
Foreword i
1 Scope
2 Normative references
3 Principle
4 Test devices
5 Specimen
6 Test procedures
7 Test report
