GB/T 46049-2025Rubber- or plastic-coated fabrics - Physical and mechanical test - Determination of bending force (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020

"Directives for standardization - Part 1.Rules for the structure and drafting of

standardizing documents".

This document is identical to ISO 22751.2020 "Rubber- or plastic-coated fabrics -

Physical and mechanical test - Determination of bending force".

Attention is drawn to the possibility that some of the elements of this document may be

the subject of patent rights. The issuing authority of this document shall not be held

responsible for identifying any or all such patent rights.

This document was proposed by China Petroleum and Chemical Industry Federation.

This document shall be under the jurisdiction of National Technical Committee on

Rubber and Rubber Products of Standardization Administration of China (SAC/TC 35).

Drafting organizations of this document. Fuzhou University, Hebei Tongye

Metallurgical Technology Co., Ltd., Wuhu Yichang Technology Co., Ltd., Shenyang

Rubber Research and Design Institute Co., Ltd., STSC (Ningde) Technology Co., Ltd.,

Boge Rubber & Plastic (Zhuzhou) Co., Ltd., Shenzhen Futureway Technology Co., Ltd.,

Fujian Sijia Industrial Material Co., Ltd., Shandong Hengda Rubber & Plastic Co., Ltd.

Main drafters of this document. Zheng Yuying, Lin Zhuozhe, Zhang Xuefeng, Yu Qiuyu,

Li Sa, Kang Xiaotian, Miao Xianyu, Guo Chunjie, Zhang Yi, He Chaojin, Gao Cong,

Xiao Xiao.

Rubber- or plastic-coated fabrics - Physical and mechanical

test - Determination of bending force

1 Scope

This document describes the test method for the determination of bending force of

rubber- or plastic-coated fabrics.

2 Normative references

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

GB/T 24133-2009 Rubber-or plastics-coated fabrics - Standard atmospheres for

conditioning and testing (ISO 2231.1989, IDT)

ISO 2286-3 Rubber- or plastics-coated fabrics - Determination of roll characteristics

- Part 3.Method for determination of thickness

NOTE. HG/T 3050.3-2020 Rubber- or plastics-coated fabrics - Determination of roll

characteristics - Part 3.Method for determination of thickness (ISO 2286-3.2016, IDT)

ISO 7500-1 Metallic materials - Calibration and verification of static uniaxial testing

machines - Part 1.Tension/compression testing machines - Calibration and

verification of the force-measuring system

NOTE. GB/T 16825.1-2022 Metallic materials - Calibration and verification of static uniaxial

testing machines - Part 1.Tension/compression testing machines - Calibration and verification

of the force-measuring system (ISO 7500-1.2018, IDT)

3 Terms and definitions

For the purpose of this document, the following terms and definitions apply.

3.1

bending force

Force exerted on the measuring bar by the specimen at a specified bending angle (3.2),

bending length (3.3), and bending rate (3.4).

3.2

bending angle

Angle corresponding to the measured bending force.

3.3

bending length

Length of the specimen that is bent.

NOTE. Bending length is the distance between the clamping device of the specimen and the

measuring bar that receives the specimen force.

3.4

bending rate

Rate at which the specimen bends.

3.5

compression-bending

Bending caused by compression of the coating layer.

3.6

extension-bending

Bending caused by extension of the coating layer.

4 Test principle

The bending force is determined using the measuring bar method (two-point bending

method). In this method, the specimen is clamped in a rotatable fixture. During the

rotation, the specimen exerts a force to the measuring bar. The force acting at a specified

bending angle is measured.

5 Apparatus