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GB/T 47908-2026Composites and reinforcements fibres - Carbon fibre reinforced plastics (CFRPs) and metal assemblies - Characterization of durability of adhesive interfaces by wedge rupture test (English PDF)

复合材料和增强纤维碳纤维增强塑料（CFRPs）和金属组件粘接界面耐久性楔型断裂试验表征方法

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Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

July 2, 2026

Implementation date

February 1, 2027

Scope

GB/T 47908-2026 is the English-translated version of 复合材料和增强纤维碳纤维增强塑料（CFRPs）和金属组件粘接界面耐久性楔型断裂试验表征方法.

GB/T 47908-2026 is a Chinese national standard on a wedge rupture test for characterising the durability of adhesive interfaces between carbon fibre reinforced plastics (CFRPs) and metal assemblies.

It is equivalent to ISO 8060:2024. The standard describes how a wedge test on a double cantilever beam (DCB) specimen is used to determine fracture characteristics under specific environmental conditions.

The method is applicable to evaluating the durability of the bonded joints between CFRPs and metal components, and the safety and reliability of adhesives, CFRP sheets and metal sheet surface treatments.

ISO 9142 is its normative reference. Issued on 2 July 2026 and applicable from 1 February 2027.

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Document preview — GB/T 47908-2026

National Standard of the People's Republic of China

ICS: 59.100.20
Classification: Q 53

Issued by: State Administration for Market Regulation

Foreword
1 Scope
2 Normative references
3 Terms, Definitions and Symbols

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

This document is equivalent to ISO 8060:2024 "Composite materials and reinforcing fibers - Carbon fiber reinforced plastics (CFRPs) and metal components".

A wedge fracture test method for characterizing the durability of adhesive interfaces.

1 Scope

This document describes a method for determining the fracture characteristics of carbon fiber using a wedge-shaped fracture test with a double cantilever beam (DCB) specimen under specific environmental conditions.

Methods to improve the durability of the bonding joints between CFRPs and metal components.

This document is applicable to evaluating the safety and reliability of adhesives, CFRP sheets, and metal sheet surface treatments.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

Note: GB/T 9341-2008 Determination of flexural properties of plastics (ISO 178:2001, IDT)

ISO 9142 Guide to the Selection of Standard Laboratory Aging Conditions for Adhesive Bonding Specimens

Note: GB/T 35489-2017 Guidelines for Aging Conditions of Adhesives (ISO 9142:2003, MOD)

Note: GB/T 16997-2025 Representation of principal failure types of adhesives (ISO 10365:2022, IDT)

3 Terms, Definitions and Symbols

3.1 Terms and Definitions

The terms and definitions defined in ISO 10365 apply to this document.

3.2 Symbols

The following symbols apply to this document. a. Crack length from the contact point between the front end of the wedge and the adhered material to the crack tip, in millimeters (mm), see Figure 4; a0.Initial crack length after wedge insertion, in millimeters (mm);

E1.Flexural modulus of carbon fiber reinforced plastic (CFRP), measured in gigapascals (GPa) (the substrate is a fiber composite material); E2.Flexural modulus of metal sheet, measured in gigapascals (GPa);

GC. Adhesive fracture energy, measured in joules per square meter (J/m²) (critical strain energy release rate generated by wedge insertion into a pre-crack);

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 9 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 9142

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