GB/T 38018-2019 PDF in English


GB/T 38018-2019 (GB/T38018-2019, GBT 38018-2019, GBT38018-2019)
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GB/T 38018-2019100 Add to Cart Auto, < 3 mins Footwear -- Test method for soles -- Fatigue resistance Valid

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GB/T38018-2019 (GBT38018-2019): PDF in English

GB/T 38018-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 61.060
Y 78
Footwear - Test Method for Soles - Fatigue Resistance
ISSUED ON: AUGUST 30, 2019
IMPLEMENTED ON: MARCH 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 4 
4 Principle ... 4 
5 Test Equipment ... 5 
6 Sample and Conditioning ... 6 
7 Test Procedures ... 7 
8 Result Expression ... 8 
9 Test Report ... 8 
Footwear - Test Methods for Soles - Fatigue Resistance
1 Scope
This Standard stipulates the test methods for soles in fatigue resistance.
This Standard is applicable to finished shoes and shoe soles with the footwear size of
235 and above.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 22049-2019 Footwear - Standard Atmospheres for Conditioning and Testing of
Footwear and Components for Footwear
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Fatigue Compression
Fatigue compression refers to the process of applying several times of cyclic
compression onto the sample; using the property variation of the test material before
and after the cyclic compression to represent the material’s recovery performance.
3.2 Fatigue Resistance of Anti-compression
Fatigue resistance of anti-compression refers to material’s capability of maintaining its
performance, physical and mechanical properties and functions unchanged under the
condition of certain pressure, certain time and certain numbers of compression.
4 Principle
At a certain rate, apply pressure onto the shoe sole material, which approaches the
pressure value on the plantar part when a person is jogging. Simulate the foot’s
repeated compression process on the material during the actual wearing process. After
a certain times of fatigue compression, test the material’s thickness, property and
appearance variation. Adopt thickness and property variation rate, and appearance
Figure 1 -- Sketch Map of Punch Hammer Shape Used for Fatigue
5.1.4 Equipment’s compression rate: 6 times/min ~ 240 times/min, adjustable.
5.1.5 Driver’s force value (force value sensor): measuring range: 0 N ~ 5,000 N,
accurate to 0.01 N. The minimum sampling frequency of force value is 100 Hz.
5.1.6 Data acquisition system: adopt a specific program to record the whole process
of data acquisition from the force-sensing system.
5.2 Thickness Measuring Instrument
Measuring range: 0 mm ~ 50 mm, accurate to 0.01 mm. Compression diameter: (10 ±
0.5) mm; intensity of pressure: (29.3 ± 0.1) kPa.
6 Sample and Conditioning
6.1 Sample
6.1.1 Sample quantity
Sample of whole shoe (remove the upper band) or shoe sole shall be not less than 1
pair.
6.1.2 Sample preparation
6.1.2.1 Cutting of upper band
In terms of whole shoe, along the bottom line of the upper part, cut off the upper part
of the shoe. If there is an inner sole, double-sided adhesive tape may be used to fasten
the inner sole onto the internal surface of the shoe sole (so as to guarantee that the
inner sole will not have any displacement during the impact process).
NOTE: whole shoe sole includes all the material layers between human feet and the
ground, such as external sole, midsole and insole, etc.
6.1.2.2 Selection of compression location
On the internal surface of the shoe sole (the surface that touches feet, for example,
the surface of insole or inner sole), select a compression location and mark it:
---Location of forefoot: select Point B, which is 75% ± 2 mm of the insole length of
the whole shoe. This point shall be equidistant with the internal side and the
external side of the insole. In addition, take this point as the center to make a
circle with the diameter of 30 mm;
---Location of heel: select Point A, which is 12% ± 2 mm of the insole length of the
whole shoe. This point shall be equidistant with the internal side and the
7.4 Select test rate: (120 ± 12) times/min, or, other test frequencies may also be
selected in accordance with the actual demand.
7.5 Set up the times of test compression into 50,000, or, the times of compression may
also be set up in accordance with the actual demand.
7.6 Initiate continuous compression mode; conduct continuous compression test on
the sample.
7.7 After the compression test is completed, remove the compressed sample from the
equipment; place it under the environmental condition stipulated in 6.2 for (24 ± 1) h.
Determine the shoe sole thickness and other properties (such as impact shock
attenuating property and resilience property) of the forefoot and the heel in the
corresponding locations after the fatigue compression.
8 Result Expression
8.1 In accordance with Formula (1), respectively calculate the thickness variation rate
of the forefoot and the heel of the shoe sole, accurate to 0.1%:
Where,
d1---thickness of sample after fatigue compression, expressed in (mm);
d0---thickness of sample before fatigue compression, expressed in (mm).
8.2 Describe and record appearance variation of the shoe sole.
8.3 In accordance with demands, evaluate the variation of other properties (such as
impact shock attenuating property and resilience property) of the shoe sole.
9 Test Report
Test report shall at least include the following content:
a) Serial No. of this Standard;
b) Specification, model and manufacturer information of test samples;
c) Model of test equipment;
d) Compression force value and compression frequency selected during the test;
e) Impact location (forefoot and heel) selected during the test;
.......
Source: https://www.ChineseStandard.net/PDF.aspx/GBT38018-2019