GB/T 45175-2024 PDF English
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GB/T 45175-2024: Footwear - Test methods for whole shoe - Fatigue resistance of touch and close fasteners
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT45175-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 61.060
CCS Y 78
GB/T 45175-2024
Footwear - Test methods for whole shoe - Fatigue resistance
of touch and close fasteners
Issued on: DECEMBER 31, 2024
Implemented on: JULY 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 4
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Principle... 6
5 Test equipment... 7
6 Sampling... 8
7 Environmental conditioning... 8
8 Test steps... 8
9 Test results... 11
10 Test report... 12
Bibliography... 13
Footwear - Test methods for whole shoe - Fatigue resistance
of touch and close fasteners
1 Scope
This document describes the test methods for the fatigue resistance of touch and close
fasteners on whole shoes after repeated opening and closing.
This document applies to the touch and close fasteners used on various whole shoes.
The raw materials of touch and close fasteners shall refer to this document.
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 2703 Footwear - Vocabulary
GB/T 3903.20-2008 Footwear - Test methods for accessories. Touch and close
fasteners - Peel strength before and after repeated closing
GB/T 16825.1 Metallic materials - Calibration and verification of static uniaxial
testing machines - Part 1.Tension/compression testing machines - Calibration and
verification of the force-measuring system
GB/T 22049 Footwear - Standard atmospheres for conditioning and testing of
footwear and components for footwear
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 2703 and
the following apply.
3.1
fatigue
Performance degradation or material breakage of a material caused by damage or
deformation accumulation under long-term or repeated load and strain.
3.2
fatigue resistance
Ability of touch and close fasteners to resist fatigue damage after repeated opening and
closing under specified conditions.
3.3
peel strength
Under specified test conditions, force required per unit effective width to separate a
bonded touch and close fastener from one end.
[Source. GB/T 3903.20-2008, 3.1]
3.4
shear strength
Under specified test conditions, the maximum force used to longitudinally pull apart
per unit effective area of the specified bonding area of a touch and close fastener.
[Source. GB/T 3903.21-2008, 3.1, modified]
3.5
shear force
Under specified test conditions, the maximum force used to longitudinally pull apart
the specified bonding area of a touch and close fastener.
3.6
effective width
Width of the vertical long side of touch and close fasteners, excluding the base side.
[Source. GB/T 3903.20-2008, 3.2]
4 Principle
Simulate the repeated opening and closing process of touch and close fasteners when
putting on and taking off shoes, test the performance changes of touch and close
fasteners after a certain number of opening and closing, and use peel strength, shear
strength or shear force to evaluate the fatigue resistance of touch and close fasteners.
5 Test equipment
5.1 Tension testing machine
It shall meet the requirements of class 2 in GB/T 16825.1 and meet the following
requirements.
a) the moving speed of the clamp is (100 ± 10) mm/min;
b) the force value is continuously recorded during the test.
5.2 Roller
It shall comply with the provisions of 5.2 in GB/T 3903.20-2008.
5.3 Fork
It shall comply with the provisions of 5.3 in GB/T 3903.20-2008.
5.4 Whole shoe touch and close fastener repeated opening and closing testing
machine
The whole shoe touch and close fastener repeated opening and closing testing machine
is shown in Figure 1, which includes the following components.
- roller device, of which the diameter is (55 ± 2) mm, the stroke is adjustable in the
range of 5 mm ~ 80 mm, and the repeated opening and closing frequency is
adjustable in the range of 10 times/min ~ 60 times/min;
- touch and close fastener fixing device, including a touch and close fastener pressing
plate and a roller bayonet pressing plate, which fix the touch and close fastener,
and can be adjusted according to the length of the touch and close fastener;
- during the rotation of the roller, the roller applies a force of (1.0 ± 0.1) N per
millimeter width to the touch and close fastener; the horizontal displacement of the
roller is adjustable so that the touch and close fastener will not separate from each
other when repeatedly opened and closed.
5.5 Steel ruler
The division value shall be at least 1.0 mm.
6 Sampling
Each group of samples shall contain at least one pair of whole shoes. Cut the hook and
loop parts of the touch and close fasteners from the whole shoes as samples. The touch
and close fasteners shall remain intact, and the upper connected to the touch and close
fasteners shall be retained for easy clamping and fixing.
7 Environmental conditioning
Before the test, place samples under the reference standard environmental conditions
specified in GB/T 22049 for conditioning for at least 24 h. The test for samples is also
carried out in this environment.
8 Test steps
8.1 Peel strength
8.1.1 Measure the effective width of the hook side and loop side of the touch and close
fastener to an accuracy of 1 mm, and take the smaller of the two width values as the
effective width of the touch and close fastener. When the width of the touch and close
fastener removed from the whole shoe is irregular, measure the effective width of the
two ends and the middle of the touch and close fastener, and take the average value as
the effective width of the touch and close fastener.
8.1.2 Take the touch and close fastener sample removed from the whole shoe, along the
opening direction of the touch and close fastener, gently bond the hook side and loop
side.
8.1.3 Use the roller rolling method to firmly bond the touch and close fastener according
to the following steps.
a) Adjust the fork (5.3) and roller (5.2) device to apply a force of (1.0 ± 0.1) N per
millimeter width of the touch and close fastener.
b) Use the roller (5.2) to press the entire bonded touch and close fastener horizontally.
c) Turn the touch and close fastener left and right and repeat step b).
d) Repeat steps b) and c) 4 times, so that the touch and close fastener is horizontally
pressed by the roller a total of 10 times.
NOTE. During the rolling process, the center of gravity of the roller does not deviate from the center
line of the touch and close fastener, and the roller covers the entire width of the bonded touch and
close fastener.
8.1.4 Along the opening direction of the touch and close fastener on whole shoes,
partially peel off the touch and close fastener from the end, fix the loop side of the touch
and close fastener to the upper clamp of the tension testing machine, and fix the hook
side of the touch and close fastener to the lower clamp. If there is a clampable upper,
the touch and close fastener may not be partially peeled off.
8.1.5 Clamp the two ends of the touch and close fastener in the normal opening direction
on the upper and lower clamps of the tension testing machine, respectively, ensuring
that the long side of the sample is parallel to the axis of the machine.
8.1.6 Start the tension testing machine, the moving speed of the clamp is (100 ± 10)
mm/min, and completely peel off the touch and close fastener.
8.1.7 Determine the average value of the peeling force from the force value curve of
the recording system, in Newton (N).
8.1.8 Repeat the test steps of 8.1.2 to 8.1.7 twice, and record the test results of 3 times.
8.2 Shear force and shear strength
8.2.1 Measure the effective width of the hook side and loop side of the touch and close
fastener to an accuracy of 1 mm, and take the smaller of the two width values as the
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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