GB/T 45474-2025Test method for mode II interlaminar fracture toughness of carbon fiber reinforced composite materials — Three point bending method with end notched (English PDF)

碳纤维增强复合材料II型层间断裂韧性的测定端部切口三点弯曲法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 28, 2025

Implementation date

October 1, 2025

Scope

GB/T 45474-2025 is the English-translated version of 碳纤维增强复合材料II型层间断裂韧性的测定端部切口三点弯曲法.

GB/T 45474-2025 is the Chinese national standard covering how much energy it takes to make a delamination slide along its plane rather than open — the end notched specimen, the three point bending fixture and the rest of the test equipment, the test conditions and the loading, the load and displacement record, and the calculation of the critical strain energy release rate in joules per square metre for unidirectional tape and 0/90 fabric laminates. First edition, in force from 1 October 2025. Issued on 28 March 2025, it has been in force since 1 October 2025.

Document preview — GB/T 45474-2025

National Standard of the People's Republic of China

ICS: 59.100.20
Classification: Q 53

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

Foreword
1 Scope
2 Normative references
3 Terms and definitions
3.1 Flexibility
3.2 [Source. GB/T 40724-2021, 6.77]
3.3 GIIC

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document is proposed and coordinated by the National Carbon Fiber Standardization Technical Committee (SAC/TC572).

This document was drafted by: China Aircraft Strength Research Institute, Shenyang Aircraft Design and Research Institute of China Aviation Industry Corporation, Shanghai Qinyaohang Air Test Technology Co., Ltd., Nanjing Fiberglass Research and Design Institute Co., Ltd., and China Aviation Manufacturing Technology Research Institute.

The main drafters of this document are: Li Lei, Song Guibin, Tang Kun, Wang Binwen, Huang Guangqi, Xie Jiahui, Sui Xiaodong, Si Kui, Ma Dan, Xiong Huafeng, Shi Fenghui, Cheng Pengfei, Song Nan, Duan Minge.

Mode II interlaminar fracture toughness of carbon fiber reinforced composites Three-point bending method with end notch

1 Scope

This document describes the principle of the test method for type II interlaminar fracture toughness of carbon fiber reinforced composite materials, the test equipment and materials, specimens, Test conditions, test steps, calculation formulas and test reports.

This document is only applicable to the performance of mode II interlaminar fracture toughness of carbon fiber reinforced composite unidirectional tape or [(0/90)]n fabric laminates. Determination.

2 Normative references

GB/T 1446

GB/T 3961

GB/T 40724

3 Terms and definitions

The terms and definitions defined in GB/T 3961, GB/T 40724 and the following apply to this document.

3.1 Flexibility

The degree to which a structure deforms under external forces.

3.2 [Source. GB/T 40724-2021, 6.77]

The rate of change of strain energy of a cracked object as the crack propagates.

3.3 GIIC

The critical value of strain energy release rate when delamination crack starts to propagate under mode II sliding load.

Note. Mode II interlaminar fracture toughness is measured in joules per square meter (J/m2).

[Source. GB/T 40724-2021, 6.82]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Editions of GB/T 45474

Edition	Title	Revision	Status
GB/T 45474-2025	Test method for mode II interlaminar fracture toughness of carbon fiber reinforced composite materials - Three point bending method with end notched	current edition	Current

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