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GB/T 45471-2025: Test method for mode III interlaminar fracture toughness of carbon fiber reinforced composite materials - Edge crack torsion method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 45471-2025 | English | 199 |
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Test method for mode III interlaminar fracture toughness of carbon fiber reinforced composite materials - Edge crack torsion method
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GB/T 45471-2025
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Basic data | Standard ID | GB/T 45471-2025 (GB/T45471-2025) | | Description (Translated English) | Test method for mode III interlaminar fracture toughness of carbon fiber reinforced composite materials - Edge crack torsion method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q53 | | Classification of International Standard | 59.100.20 | | Word Count Estimation | 10,179 | | Date of Issue | 2025-03-28 | | Date of Implementation | 10/1/2025 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 45471-2025: Test method for mode III interlaminar fracture toughness of carbon fiber reinforced composite materials - Edge crack torsion method
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 59.100.20
CCSQ53
National Standard of the People's Republic of China
Mode III interlaminar fracture toughness of carbon fiber reinforced composites
Determination of edge crack torsion method
Released on 2025-03-28
2025-10-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
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, Nanjing Fiberglass Research and Design Institute Co., Ltd., China Aviation Manufacturing Technology Research Institute
Research Institute, Shenyang Aircraft Design and Research Institute of Aviation Industry Corporation of China, and Shanghai Qinyao Aviation Testing Technology Co., Ltd.
The main drafters of this document are. Song Guibin, Li Lei, Wang Binwen, Duan Minge, Li Xiaolong, Xie Jiahui, Xiong Huafeng, Sui Xiaodong, Shi Fenghui, Ma Dan,
Chen Xiangming, Si Kui, Tang Kun, and Song Nan.
Mode III interlaminar fracture toughness of carbon fiber reinforced composites
Determination of edge crack torsion method
1 Scope
This document describes the principle, test equipment, test specimens, test methods and test methods of carbon fiber reinforced composite material type III interlaminar fracture toughness test method.
The test conditions and test steps are given, as well as the calculation formula and the writing content of the test report.
This document is applicable to the determination of mode III interlaminar fracture toughness of carbon fiber reinforced composite laminates.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 1446 General principles for test methods for properties of fiber reinforced plastics
GB/T 3961 Terminology of fiber reinforced plastics
GB/T 40724 Terminology of carbon fiber and its composite materials
3 Terms and definitions
The terms and definitions defined in GB/T 3961 and GB/T 40724 and the following apply to this document.
3.1
Compliance
The degree to which a structure deforms under external forces.
3.2
The rate of change of strain energy of a cracked object as the crack propagates.
[Source. GB/T 40724-2021, 6.77]
3.3
GⅢC
The critical value of strain energy release rate when delamination crack starts to propagate under mode III tearing load.
Note. Mode III interlaminar fracture toughness is measured in joules per square meter (J/m2).
[Source. GB/T 40724-2021, 6.86]
4 Principle
The load is applied to the edge-cut specimen in the form of torsion loading (see Figure 1), so that the specimen is subjected to the τZX shear stress (X direction on the ZX plane).
The delamination expansion occurs under the action of shear stress, thereby obtaining the mode III interlaminar fracture toughness (GⅢC) of carbon fiber reinforced composite materials.
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