GB/T 30907-2025 PDF English
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| GB/T 30907-2025 | English | 215 |
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Rubber shoes - Test method for shock attenuating properties of athletic shoes
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| GB/T 30907-2014 | English | 209 |
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Rubber shoes -- Test method for shock attenuating properties of athletic shoes
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GB/T 30907-2025: Rubber shoes - Test method for shock attenuating properties of athletic shoes---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/GBT30907-2025
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 61.060
CCS Y 78
Replacing GB/T 30907-2014
Rubber shoes - Test method for shock attenuating properties
of athletic shoes
Issued on: MARCH 28, 2025
Implemented on: OCTOBER 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Test principle... 6
5 Test equipment... 7
6 Specimens... 10
7 Specimen conditioning... 11
8 Test steps... 12
9 Test results... 13
10 Test report... 14
Rubber shoes - Test method for shock attenuating properties
of athletic shoes
WARNING. People who use this document shall have practical experience in
regular laboratory work. This document does not point out all possible safety
issues. Users are responsible for taking appropriate safety and health measures
and ensuring that the conditions stipulated by relevant national laws and
regulations are met.
1 Scope
This document describes the test principles for the shock-attenuating properties of
rubber shoes and athletic shoes under specified test conditions, and specifies the test
equipment, test specimens, test specimen conditioning, test procedures, test results and
test report contents.
This document is applicable to the evaluation of the shock-attenuating effect of rubber
shoes and athletic shoes.
2 Normative references
The provisions of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for referenced
documents with dates, only the versions corresponding to the dates are applicable to
this document; for referenced documents without dates, the latest versions (including
all amendments) are applicable to this document.
GB/T 2941 Rubber - General procedures for preparing and conditioning test pieces
for physical test methods
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 cushioning system
One or more sole components that distribute pressure and/or attenuate shock.
NOTE. The sole components are the insole, innersole, midsole and outsole or their combination.
3.2 tup
It is in contact with the sample during the impact process and is the most important
component of the impact device of the equipment.
3.3 impact
Collision between the tup and the cushioning system.
3.4 drop height
The height from which the impact device is dropped.
NOTE. The distance between the upper surface of the test specimen and the lower end of the tup.
3.5 maximum energy applied
The energy applied to a sample to produce its maximum compressive displacement.
3.6 absorb energy
The energy absorbed by a cushioning system during a single impact cycle.
3.7 moderate impact
The reaction force of the ground is greater than or equal to 1.5 times and less than 3
times the wearer's body weight, and the peak axial acceleration of the lower limbs is
greater than or equal to 4 gravitational accelerations (4g) and less than 8 gravitational
accelerations (8g).
3.8 high impact
The reaction force of the ground is greater than or equal to 3 times the wearer's body
weight, and the peak axial acceleration of the lower limbs is greater than or equal to 8
gravitational accelerations (8g).
4 Test principle
The test specimen is fixed on a hard platform and continuously impacted by a falling
impact device. The sensor is used to measure the force and displacement when the tup
impacts the test specimen during the impact cycle and record them as a related curve.
The peak value and the rebound rate of the tup during the impact process are calculated
from the collected data to evaluate the shock-attenuating effect of the test specimen.
6 Specimens
6.1 Specimen preparation
The upper of the specimen is cut off at 10.0 mm±5.0 mm above the adhesive line
between the upper and the sole. The remaining upper shall not affect the falling of the
impact device. If it affects the falling of the impact device, the remaining upper shall
be cut off.
To avoid interference with the cushioning system during the removal of the upper, the
bonding between the sole and the upper (which may affect the shock attenuating
properties) shall be retained to serve as a fixing device for any loose parts of the
cushioning system.
6.2 Specimen shape
The specimen shall have a flat plane and be circular with a diameter of at least 65.0 mm.
The center of the plane shall be aligned with the center of the tup. When the tup contacts
the specimen, there shall be a spacing of not less than 10.0 mm between the edge of the
tup and the edge of the specimen on all sides.
NOTE. The shape of the specimen varies with the design of the shoe itself. The shape of the shoe is a
factor that affects the shock-attenuating properties, and this factor may be detected by this test method.
Therefore, this document does not specify a standard specimen shape; the results obtained from samples
of different shapes, thicknesses and sizes are not comparable.
6.3 Specimen test position
6.3.1 Heel
When testing the shock-attenuating properties of the heel, as shown in Figure 4, the
center of the tup is aligned with a point on the surface of the specimen (shoe). The point
is at a distance from the heel that is 12% of the inner length of the upper surface of the
specimen. The distance between this point and the two sides of the specimen is equal,
and the deviation shall not exceed 2.0 mm.
6.3.2 Forefoot
When testing the shock-attenuating properties of the forefoot, as shown in Figure 4, the
center of the tup is aligned with a point on the surface of the specimen (shoe). The point
is at a distance from the heel that is 75% of the inner length of the upper surface of the
specimen. The distance between this point and the two sides of the specimen is equal,
and the deviation shall not exceed 2.0 mm.
8 Test steps
8.1 Method A
8.1.1 Fix the specimen on the fixed platform device, with the center of the impact
position to be tested being aligned with the center of the tup, and it shall not move
during impact.
8.1.2 Select and adjust the test instrument according to the maximum energy applied to
the specimen. In method A, a maximum energy of 5.0 J±0.5 J is generally applied to
the specimen.
8.1.3 For athletic shoes that are subjected to moderate impact during normal wear, an
energy of 5.0 J is applied. For athletic shoes that are subjected to high impact, an energy
of 7.0 J is applied. If an energy different from 5.0 J or 7.0 J is used, it shall be stated in
the test report. The deviation of the maximum energy applied to the athletic shoes shall
not exceed 10%.
NOTE. The impact test is a test method designed to simulate the impact of energy, pressure and load
speed on the cushioning system of athletic shoes during daily wear. For general-purpose athletic shoes,
a reference energy of 5.0 J is more suitable. However, the reference energy value may also change with
the model of the athletic shoes to be tested and the different parts to be tested (heel or forefoot). For
athletic shoes that are subjected to moderate impact on the cushioning system during normal wear, the
reference energy value is 5.0 J, including running shoes (heel) and multi-functional fitness shoes (heel
and forefoot); for those subjected to high impact, the reference energy value is 7.0 J, including basketball
shoes, tennis shoes and volleyball shoes.
8.1.4 Lower the tup and lightly touch it on the upper surface of the specimen, reset the
displacement sensor, and then adjust the tup drop height to 50.0 mm±2.5 mm.
NOTE. If the impact energy is 7 J, the drop height of the tup shall be 70.0 mm±2.5 mm. If other impact
energies are used, the appropriate drop height shall be adjusted according to the impact energy.
8.1.5 Start the instrument and impact 30 times continuously. The first 25 times are used
as adjustments for the specimen, and the shock attenuating property data is collected
during the 26th~30th cycles. Record the force-displacement test data of the last 5 impact
cycles.
8.1.6 Remove the specimen from the instrument, and observe and record any damage
or loss on the specimen surface.
8.2 Method B
8.2.1 Fix the specimen on the fixed platform device so that the tup is aligned with the
center of the impact position on the specimen to ensure that the specimen does not move
when impacted.
8.2.2 Lower the tup and lightly touch it on the upper surface of the specimen, reset the
displacement sensor, and then adjust the tup drop height to 50.0 mm±2.5 mm, recorded
as Hy, to ensure that the displacement sensor displays the corresponding height.
8.2.3 Start the instrument and release the tup to allow it to fall freely and impact the
specimen.
8.2.4 After the tup has come to rest, lift it up to the same height again and repeat the
impact 4 times, with the interval between each repeated impact being 2 seconds.
8.2.5 Stop the test and check the recorded test data curve. If the maximum acceleration
deviation of the tup does not exceed 5 m/s2 and the maximum depth deviation does not
exceed 0.5 mm in the last three tests, then end the test. Otherwise, repeat the test until
the deviation of the output results for three consecutive times is within the above range.
8.2.6 Record the maximum acceleration, maximum depth and first rebound height Hf
of the tup in the last impact test. The maximum acceleration shall be accurate to an
integer, and the maximum depth and first rebound height shall be accurate to one
decimal place.
8.2.7 Remove the specimen from the instrument, and observe and record any damage
or loss on the specimen surface.
9 Test results
9.1 Numerical calculation
The following values are calculated based on the relative relationship between force
and displacement and appropriate conversion factors. The corresponding relationship
between the values is shown in Figure 3.
1) Maximum shock attenuating force (FM). the maximum value recorded by the
force sensing system, in Newtons (N).
2) Maximum deformation of the cushioning system (DM). the maximum value
recorded by the displacement sensing system, in millimeters (mm).
3) Maximum energy applied (UM). at the point where the displacement peak
occurs, in joules (J).
4) Absorb energy by the cushioning system (UF). at the point after the peak force,
and the force value is zero; the unit is joule (J).
9.2 Result calculation
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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