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GB/T 40721-2021Rubber - Determination of frictional properties (English PDF)

橡胶摩擦性能的测定

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

October 11, 2021

Implementation date

May 1, 2022

Scope

GB/T 40721-2021 is the English-translated version of 橡胶摩擦性能的测定.

GB/T 40721-2021 is the Chinese standard "Rubber - Determination of frictional properties".

Its scope clause reads: This document provides the measurement principle of the friction coefficient, describes the rubber and the standard test plane, the rubber material itself or the rubber and other specified Method for measuring the coefficient of friction between surfaces. Its clauses include terms and definitions.

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Document preview — GB/T 40721-2021

National Standard of the People's Republic of China

Classification: G 40

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Equipment
6 Test surface
7 Sample preparation
8 Sample adjustment
9 Test Step
10 Cleaning or renewal of test track
11 Procedure A (Initial friction measurement)
12 Procedure B (working condition operation)
13 Procedure C (test of adding lubricant or contaminants)
14 Stick-slip
15 Results showing
16 Test report
Appendix A (informative) Design Principle
Appendix B (informative) Sphere-surface shape
Appendix C (informative) Static friction and "adhesion"
Appendix D (informative) Other parameters

1 Scope

This document provides the measurement principle of the friction coefficient, describes the rubber and the standard test plane, the rubber material itself or the rubber and other specified

Method for measuring the coefficient of friction between surfaces.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

GB/T 17200-2008 Technical Specification for Rubber and Plastic Tensile, Compression and Flexural Testing Machine (Constant Speed Drive) (ISO 5893.2002,

IDT)

ISO 23529 Rubber-General proceduresforpre- paringandconditioningtestpiecesforphysicaltestmethods)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Coefficient of friction

Under the specified test conditions, the ratio of the frictional force that hinders movement between two flat surfaces to its normal force.

Note. The friction coefficient is dimensionless, and its value is not limited to numbers less than 1.

3.2 Areaofcontact

The entire apparent area between two test surfaces (test track and specimen).

Note. The actual contact area (see 3.3) may be smaller than this area.

3.3 Realareaofcontact

The sum of all the tiny contact areas of the two test surfaces.

3.4 Velocityoftest

The driving speed of one surface relative to the other.

Note. If stick-slip occurs (see 3.5), the speed will be the average speed of one surface relative to another surface.

3.5 Stick-slip

Since the actual relative speed between the two surfaces oscillates between the two extreme values of the test speed, the measured friction force produces a corresponding oscillation.

state.

GB/T 40797 | GB/T 40720 | GB/T 35858 | GB/T 40719 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 37 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 17200-2008Technical specification for tensile, compression and flexural testing machines for rubber and plastics (constant rate of traverse)

ISO 5893.2002 · ISO 23529

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