Original standard number GB 3901-83 HG/T 2873-1997 Rubber shoe sole flexion test method HG/T2873-1997 Standard download decompression password: www.bzxz.net

HG / T 2873 --1997
This standard is a revision of the original GB/T3901-83 "Test method for deflection of rubber shoe outsole". During the revision, this standard added reference standards, scope, principle, test specimens, test reports and other contents, and made the following modifications and supplements to the test equipment, test procedures, test results and expressions. 1GB/T3901-83 1.4 stipulates that the reciprocating frequency of the lower clamp is 250-300r/min, which is now changed to 300r/min±10r/min.
2GB/T3901-83 3.1 stipulates that the test outsole is sampled according to the principle of randomness, and men's shoes are sampled from size 25 and above, and women's shoes are sampled from size 23. It is changed to the test outsole shoe size should be sampled from size 20 and above3 GB/T 3901-83 3.2 stipulates that the sample is 1 and is changed to each group of samples is t pairs of shoe outsoles, and its length is 130 mm. It is changed to 150 m±2 mm.
From the date of implementation of this standard, the original GB/T3901-83 will be abolished. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China: This standard is under the jurisdiction of Shanghai Rubber Shoes Research Institute, and this standard was drafted by Shangyou Rubber Shoes Research Institute. The main drafters of this standard are Xu Dejia and Cai Shengbei. ICS61.060www.bzxz.net
Registration No. 445—1997
Chemical Industry Standard of the People's Republic of China
Testing method for flexibility of shoes of rubber shocs1 Scope
This standard specifies the test method for flexibility of shoes of rubber shocs. HG/T 2873-1997
This standard is applicable to the determination of flexibility of rubber shoe soles: it is also applicable to the determination of flexibility of rubber soles and rubber-plastic shoe soles. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards: GB2941-91 Standard temperature, humidity and time for environmental conditioning and testing of rubber specimens (egvISO471:1983ISO 1826:1981)
3 Principle
In actual use, frequent flexion of the sole is one of the main reasons for product damage. During the reciprocating flexion of the sole, the continuous tensile stress generated on the outer sole surface will cause cracks to appear and grow on the front of the sole, and finally lead to the break of the sole. This test method uses this principle to clamp the sole on the DeMattia flexion crack tester and perform flexion tests at a certain rate to observe whether cracks occur when the sole reaches the specified flexion times. This is used to evaluate the flexion resistance of the sole under reciprocating bending conditions.
4 Test instrument
4.1 De Mattia flexion crack tester 4.1.1 The maximum spacing between the upper and lower clamps is 95 mm ± 0.50 mm; the minimum spacing between the upper and lower clamps is 60 mm ± 0.50 mm; the stroke is 35 mm ± t. 00 mm,
4.1.2 The reciprocating frequency of the lower clamp is 300r/min±10r/min.4.2 Vernier caliper, the graduation is 0.02mm,
5 Samples
5.1 The shoe size of the test sole should be 20 or above; 5.2 Each group of samples is a pair of outsole:
5.3 Take a sample perpendicular to the metatarsophalangeal part of the bend along the full width of the forefoot of the test sole, with a length of 152mm ± 2mm, and the midsole should be shrunken or hard midsole. For rubber soles, sample directly according to the above requirements. 3.4 The sole specimen of rubber and plastic sandals should be 150mm±2mm long, 25mm±1mm wide, and 5mm±0.5mm thick at the flexion part of the two forefoots. For the bottom of the hole with a thickness less than 5mm, the sample should be taken according to the actual thickness. Approved by the Ministry of Chemical Industry of the People's Republic of China on April 21, 1997, and implemented on October 1997
HG/T 2873 1997
5.5 The surface of the specimen should be flat, the thickness should be uniform, and there should be no defects, no damage and impurities, and no bubbles. 6 Test steps
6.1 The environmental adjustment and temperature of the specimen before the test should be carried out in accordance with the provisions of GB2941. 2 Clamp the specimen vertically on the upper and lower clamps, so that the bending part of the forefoot of the sole is located in the center of the two clamps, and the groove of the pattern is bent outward, see Figure 1
Upper clamp
Figure 1 Schematic diagram of specimen placement
6.3 Each Check after 10,000 twists. When the cumulative number exceeds 30,000 times, check again every 5,000 times. 6.4 Observe the changes in the specimen after stopping the machine for the predetermined number of twists. If there is a crack, measure the length of the crack with a vernier caliper. When measuring the crack on the sole, the twisting angle of the sole should be consistent with the maximum flexion angle during the test. 7 Test results and expression
7.1 If the specimen has cracks (cracks) during the test, record the number of twists and cracks (cracks). The length of the crack (crack) is expressed in 3. The significant figures shall be accurate to one decimal place, and each sample shall be indicated separately. 7.2 If the sample does not produce cracks (cracks) within the specified flexion times, record the flexion times and indicate that it does not crack. 7.3 If one of the soles of each pair of shoes has cracks, the pair of shoes shall be treated as cracked. 8 Test report
Sample name, number, specification, brand, manufacturer: laboratory temperature, humidity;
Test results;
Test date:
Tester, reviewer;
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