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GB/T 39826-2021Fine ceramics—Determining flexural bond strength—Four-point bending method (English PDF)

精细陶瓷界面弯曲强度测定四点弯曲法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 9, 2021

Implementation date

April 1, 2023

Scope

GB/T 39826-2021 is the English-translated version of 精细陶瓷界面弯曲强度测定四点弯曲法.

GB/T 39826-2021 is the Chinese method for determining the flexural bond strength of a fine ceramic joint by four-point bending at room temperature. It gives the terms and definitions, the principle, the instruments and equipment, the specimens, the test, the calculation and the test report.

It applies to the strength of the interface between ceramic and ceramic and between ceramic and metal, and the bonded interfaces of other materials may be tested by reference to it.

Ceramic works, joining specialists and test laboratories use it. Issued on 9 March 2021, it has applied since 1 April 2023.

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Document preview — GB/T 39826-2021

National Standard of the People's Republic of China

ICS: 81.060.30
Classification: Q 32

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and definitions

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the terms and definitions, principles, and instruments for determining the method for determining the bending strength of the ceramic interface by using the four-point bending method at room temperature. Equipment, samples, tests, calculations and test reports.

This standard is applicable to the determination of the bending strength of the interface between ceramics and ceramics, and ceramics and metals. The bonding interface of other materials can also be referred to use.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 6569-2006 Test method for bending strength of fine ceramics

GB/T 16491 Electronic Universal Testing Machine

GB/T 21389 Vernier, belt meter and digital caliper

3 Terms and definitions

The following terms and definitions defined in GB/T 6569-2006 apply to this document.

3.1 Interface bending strength

The beam sample containing the butt interface reaches the maximum stress when the interface fractures under the action of bending load.

3.2 Four-pointflexure

A loading form of the bending strength test, the sample is placed on two supporting rollers and passed through the two symmetrically distributed between the supporting rollers. Two upper roller bars are loaded simultaneously.

Note: See Figure 1.The support roller and the upper pressure roller can adopt cylindrical roller shafts or cylindrical bearings.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 23 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB/T 1969-2026|GB/T 47610-2026|GB/T 45598-2025|GB/T 45767-2025|GB/T 46583-2025|GB/T 46773-2025

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