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GB/T 46222-2025Test method for mixed mode I-III interlaminar fracture toughness of fiber-reinforced plastic composites (English PDF)

纤维增强塑料复合材料I型-III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 46222-2025 is the English-translated version of 纤维增强塑料复合材料I型-III型混合层间断裂韧性的测定.

GB/T 46222-2025 is the Chinese national standard covering a laminate disc loaded in torsion and tension at once, so that opening and tearing act on the delamination together — the edge ring cracked specimen with its insert and central bonded area, the combined tension-torsion machine and the fixture, the loading sequence in which the mode III load is applied before the mode I load, the propagation record, and the total critical strain energy release rate. With the mode III standard GB/T 46221-2025. 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 46222-2025

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 Principle1
5 Samples2
6 Test equipment3
7 Test conditions4
8 Experimental Procedure4
9 Result Calculation 6.8
10 Test Reports8
Appendix A (Normative) Type I-III Mixed Interlaminar Fracture Toughness Testing Fixture9

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". Drafting.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Building Materials Federation.

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

This document was drafted by: Hebei University of Technology, Chongqing University, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, and Aero Engine Corporation of China (Beijing).

Aeronautical Materials Research Institute, China Aircraft Strength Research Institute, Tianjin Astar New Materials Technology Co., Ltd., Beijing Glass Fiberglass Research Institute Testing Center Co., Ltd.

Company, Beijing University of Aeronautics and Astronautics, Beijing Fiberglass Research and Design Institute Co., Ltd.

The main drafters of this document are: Zhao Libin, Gong Yu, Zhu Yingdan, Gao Yuan, Wang Yana, Yang Shengchun, Zhang Zheyi, Ding Changfang, Yang Dexu, and Liu Fengrui.

Xu Haibing, Yu Zongzhi, Yu Wenying, Qi Xinxin, Wang Sui'an, Wang Meng.

Fiber-reinforced plastic composites Type I-III Determination of mixed interlaminar fracture toughness

1 Scope

This document describes the principle, specimens, testing equipment, and testing procedures for determining the interlaminar fracture toughness of fiber-reinforced plastic composites of types I-III hybrids.

Test conditions, test procedures, result calculation, and test report.

This document applies to Type I-III mixed-layer discontinuity fiber-reinforced plastic composite laminates prepared by prepreg autoclave molding process.

For the determination of crack toughness, the same procedure shall be followed for fiber-reinforced composite laminate specimens prepared by other molding processes.

2 Normative references

GB/T 1446

GB/T 3961

GB/T 28889

GB/T 28891

GB/T 38537

GB/T 41762.1

GB/T 46221

3 Terms and Definitions

The terms and definitions defined in GB/T 3961, GB/T 28891 and GB/T 46221, as well as the following terms and definitions, apply to this document.

3.1 Type I-III mixed mode

The crack initiation and tearing patterns caused by loads applied simultaneously vertically and parallel to the layers of the specimen.

Note. Abbreviated as "hybrid mode".

3.2 GC

Critical value of total strain energy release rate during crack initiation and propagation under the mixed mode of type I-III (3.1).

Note 1.The total strain energy release rate in the hybrid mode is the sum of the strain energy release rates of type I and type III strain energy release rates at crack initiation and propagation.

Note 2.The unit is joules per square meter (J/m2).

4 Principles

By introducing circumferential pre-cracks through inserts, symmetrical and balanced composite laminate specimens with edge circumferential cracks were formed (as shown in Figure 1).

(See diagram). A combined tensile-torsion testing machine was used to clamp the specimen-fixture assembly. A type III delamination load was introduced through torsional loading, followed by tensile loading.

By introducing a type I delamination load, the mixed interlaminar fracture toughness of the composite material (type I-III) was determined.

5 Samples

5.1 Sample shape and size

The schematic diagram of the specimen is shown in Figure 1.The specimen is a square (or circular) composite laminate of uniform thickness, and the side length (or diameter) a of the specimen is...

(120±0.5)mm, the sample thickness should not exceed 10mm for 2h. An insert prefabricated portion is introduced outside the circular central bonding area on the middle surface of the sample.

The central bonding area of the layer has a radius r of (25±1) mm, and the thickness of the embedding should not exceed 10 µm. The sample coordinate system is shown in Figure 2.

a) Front view of a square specimen b) Front view of a circular specimen

c) Top view of a square specimen d) Top view of a circular specimen Index number explanation. 1 --- Embedded object; 2 --- Central bonding area;

a --- Sample side length or diameter;

r --- Radius of the central bonding area of the sample; 2h --- Sample thickness.

Figure 1 Schematic diagram of the sample

......
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

GB/T 28889 · GB/T 28891 · GB/T 41762.1

Editions of GB/T 46222

Edition	Title	Revision	Status
GB/T 46222-2025	Test method for mixed mode I-III interlaminar fracture toughness of fiber-reinforced plastic composites	current edition	Current

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