GB/T 5565-1994 Bending test for rubber or plastic hoses and pure rubber hoses

This standard specifies the equipment, specimens, test procedures, result expression, test report, etc. for the bending test of rubber or plastic hoses and pure rubber hoses. This standard is applicable to the determination of the bending properties of rubber or plastic hoses and pure rubber hoses with an inner diameter of less than 80 mm. GB/T 5565-1994 Bending test of rubber or plastic hoses and pure rubber hoses GB/T5565-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber or plastics hoses and pure rubber hoses bending test Rubber or plastics hoses and tubing -Bending tests This standard refers to the international standard ISO1747--1983 Rubber or plastics hoses and pure rubber hoses - 1 Main content and scope of application
GB/T 5565--94
Daishan GB 5565--85
Set of bending tests".
This standard specifies the equipment, specimens, test procedures, result expression, test report and other contents of the rubber or plastics hoses and pure rubber hoses bending test.
This standard is applicable to the determination of the bending properties of rubber or plastics hoses and pure rubber hoses with an inner diameter of less than 80 mm. 2 Referenced standards
GB2941 Standard temperature, mixing degree and time for environmental conditioning and testing of rubber specimens GB/T 9573 Rubber, plastic tube and hose assembly dimension measurement method 3 Apparatus
The apparatus consists of two guide plates A and B and a track. Guide plate A is fixed on the track, and guide plate B moves along the track, parallel to guide plate A and at the same height as guide plate A (see figure). 2R
Schematic diagram of bending test apparatus
National Technical Supervision High 1994-01-02 Approved 1994-10-01 Implementation
4.1 The specimen is two soft bars.
4.2 The length of the specimen is calculated according to formula (1):
- Length of the specimen, mm!
Where L
- Minimum bending radius, mm
400- Additional length, mm.
4.3 Test conditions
GB/T 5565-94
L-#R+400
The standard temperature and humidity of the test room, the time interval between the test and thinning, and the adjustment of the sample before the test shall be carried out in accordance with the relevant provisions of GB2941 standard.
The comparative test shall be carried out under the same conditions. 5 Test Steps
5.1. Use the measuring instrument specified in GB/T9573 to measure the average outer diameter D of the teaching tube. 5.2 According to the minimum bending radius of the product, adjust the distance between the AB guide plates to be less than the length of the sample, adjust the sample to be gate-shaped (if the sample has a natural bend, follow its bend) and place it between the two guide plates, and adjust the B plate to make the sample meet the bending radius requirements. 5.3. Measure the minimum flattened outer diameter D of the bending part. 5.4 If it is necessary to measure the force used when the sample reaches the bending radius, a dynamometer should be installed on the guide plate for measurement. 6 Result expression
6.1 The deformation coefficient K is calculated according to formula (2):
Where: br
The minimum flattened outer diameter of the bending part, mm
The average outer diameter of the specimen before bending, mm. wwW.bzxz.Net
6.2 The percentage change T is calculated according to formula (3):
Where: D-the minimum flattened outer diameter of the bending part, mm
-the average outer diameter of the specimen before bending, mm.
（2）
6.3 The arithmetic mean of the two hose bending tests is taken as the test result. The deformation coefficient is rounded to two decimal places; the percentage change is accurate to 0.1%. 7 Test report
Code of this national standard:
Product standard of the tested hose,
Test intensity,
GB/T5565-94
Test data (including the force required to reach the bending radius if required); Tester
Reviewer
Test date.
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Rubber and Rubber Products, Hose Sub-Technical Committee. This standard was drafted by Shenyang Fourth Rubber Factory. The main drafters of this standard are Miao Suxia, Lv Heren, Tuo Rui, Yu Kaihui, and Wang Weixiang
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