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GB/T 46201-2025Fibre reinforced composites — Determination of mixed mode I-mode II interlaminar fracture toughness of unidirectional reinforced materials (English PDF)

纤维增强复合材料　单向增强材料I型-II型混合层间断裂韧性的测定

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 29, 2025

Implementation date

March 1, 2026

Scope

GB/T 46201-2025 is the English-translated version of 纤维增强复合材料　单向增强材料I型-II型混合层间断裂韧性的测定.

GB/T 46201-2025 is the Chinese national standard covering delamination under combined opening and shear — the mixed mode bending fixture and the ratio it sets between the two, the crack length measurement, and the toughness across the whole range from pure peel to pure shear, because a real delamination is never one or the other. First edition, under the China Building Materials Federation. In force from 1 March 2026. Issued on 29 August 2025, it has been in force since 1 March 2026.

Document preview — GB/T 46201-2025

National Standard of the People's Republic of China

ICS: 83.120
Classification: Q 23

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

PrefaceIII
1 Scope1
2 Normative references1
3 Terms and Definitions1
4 Symbols2
5 Principle3
6 Instruments and Equipment4
7 Sample5
8 Test environment conditions7
9 Test Step7
10 Result calculation8
11 Test Report1112
Appendix A (Informative) MMB Test Original Record Table12

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 by China Building Materials Federation.

This document is under the jurisdiction of the National Technical Committee for Standardization of Fiber Reinforced Plastics (SAC/TC39).

This document was drafted by: Beijing Glass and Steel Institute Testing Center Co., Ltd., China Aircraft Strength Research Institute, Zhendi (Hangzhou) New Materials Technology Co., Ltd.

Co., Ltd., Tianjin Aisda Aerospace Technology Co., Ltd., Zhejiang Zhenshi New Materials Co., Ltd., Jushi Group Co., Ltd., Guangdong Ming Yang New Energy Materials Technology Co., Ltd., AVIC Touchstone Testing Technology (Dachang) Co., Ltd., Beijing University of Technology, Harbin Fiberglass Research Institute Institute Co., Ltd., Sinochem High Performance Fiber Materials Co., Ltd., Changsheng (Langfang) Technology Co., Ltd., Lishi (Shanghai) Scientific Instrument Co., Ltd., Zhejiang Hangfei Testing Technology Co., Ltd., China Railway First Survey and Design Institute Group Co., Ltd., Beijing Glass and Steel Institute Composite Materials Co., Ltd., Tsinghua University University, AECC Beijing Institute of Aeronautical Materials, Shanghai Aircraft Manufacturing Co., Ltd., China Building Materials Inspection and Certification Group (Shandong) Metrology and Testing Co., Ltd., Beijing Goldwind Science and Technology Wind Power Equipment Co., Ltd., and Shanghai Shangbo Testing Co., Ltd.

The main drafters of this document are: Xin Tingting, Yang Shengchun, Fu Jincun, Li Lei, Zhang Yi, Liu Lianxue, Cui Fengbo, Wang Yanli, Feng Shuai, Liu Tianqiao, Yin Xiuyun, Wang Baorui, Zhang Liming, Li Penghui, Wang Bin, He Chengzhi, Luo Yejun, Tang Ke, Feng Peng, Du Shu, Jiang Yushi, Chen Xinwen, Dong Qinghai, Wang Zitong, Wu Zhiquan, and Zhang Xu. fiber-reinforced composites Mixed interlaminar fracture of unidirectional reinforced materials with type I and type II Determination of toughness

1 Scope

This document describes the use of the mixed mode bending (MMB) test to determine the properties of type I-type II hybrid layers of unidirectional fiber reinforced resin matrix composites.

Interstitial fracture toughness method.

This document is applicable to the determination of mixed mode I-II interlaminar fracture toughness of unidirectional fiber reinforced resin matrix composite laminates.

2 Normative references

GB/T 1446

GB/T 3961

3 Terms and Definitions

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

3.1 Mode I crack opening mode mode I crack opening mode

A fracture mode in which a crack is initiated by a load applied perpendicular to the specimen surface and the specimen surface does not slide relative to each other.

Note. Abbreviated as “Type I model”.

3.2 Mode II crack sliding mode mode II crack sliding mode

A fracture mode in which relative slip is caused by a load applied parallel to the surface of the specimen and in which cracking in the Type I mode (3.1) does not occur.

Note. Abbreviated as “Type II model”.

3.3 modeI-modeII mixedmode

A fracture mode characterized by crack initiation and relative slip caused by loads applied simultaneously perpendicular and parallel to the specimen's surface layers.

Note. Abbreviated as "mixed mode".

3.4 GI

In the mixed mode of type I and type II (3.3), during the constant displacement crack growth process caused by the load, the unit crack of the specimen caused by the type I mode is The rate of change of strain energy of width with crack growth.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

Editions of GB/T 46201

Edition	Title	Revision	Status
GB/T 46201-2025	Fiber reinforced composites - Determination of mixed mode I-mode II interlaminar fracture toughness of unidirectional reinforced materials	current edition	Current

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