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GB/T 45877-2025Carbon fiber composite materials — Method for planar biaxial tensile testing of laminates (English PDF)

碳纤维复合材料层合板平面双轴拉伸试验方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

June 30, 2025

Implementation date

January 1, 2026

Scope

GB/T 45877-2025 is the English-translated version of 碳纤维复合材料层合板平面双轴拉伸试验方法.

GB/T 45877-2025 is the Chinese national standard covering pulling a cross-shaped laminate specimen in two directions at once — the four independently controlled actuators and the flatness and coaxiality the clamping heads must hold, the constant load ratio and constant displacement ratio control modes, the cruciform specimen, and the strains read in the X, Y and 45 degree directions in the central area, which is where the result has to come from and not from the arms. It applies to 0/90 cross-ply laminates. First edition, in force from 1 January 2026. Issued on 30 June 2025, it has been in force since 1 January 2026.

Document preview — GB/T 45877-2025

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
4 Principles
5 Equipment and Instruments
5.1 Biaxial testing machine

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 Technical Committee on Carbon Fiber Standardization (SAC/TC572).

This document was drafted by: Shanghai Aircraft Manufacturing Co., Ltd., Northwestern Polytechnical University, Sinopec Shanghai Petrochemical Co., Ltd., Nanjing Fiberglass Research and Design Institute Co., Ltd., Shenzhen Sansi Zongheng Technology Co., Ltd., Zhongfu Shenying Carbon Fiber Co., Ltd., Yansuo Instrument Technology (Shanghai) Co., Ltd., Beijing University of Aeronautics and Astronautics, Shenzhen Wance Testing Equipment Co., Ltd., and Lishi (Shanghai) Scientific Instruments Co., Ltd., Haiguli (Suzhou) Equipment Technology Co., Ltd., OPPO Guangdong Mobile Communications Co., Ltd., Changzhou Xinchuang Aviation Technology Co., Ltd.

Shanghai Aike Testing Technology Co., Ltd., Nanjing Sinoma Standard Certification Co., Ltd., Shenzhen Haisem Technology Co., Ltd., Weihai Baoweixin Materials Technology Co., Ltd., Tianjin Aisda Aerospace Technology Co., Ltd., Weihai Mingyue New Materials Co., Ltd., Jiangsu Hengrui Aviation Industry Co., Ltd., Jiangsu Hengrui Carbon Fiber Technology Co., Ltd., Lianyungang Fiber New Materials Research Institute Co., Ltd., Shaanxi Tiance New Materials Technology Co., Ltd.

Co., Ltd., Hunan Liancheng Rail Equipment Co., Ltd., China Construction Hailong Technology Co., Ltd., Harbin Xinkerui Composite Materials Manufacturing Co., Ltd., Shenyang Zhiji Aviation Technology Co., Ltd., Xi'an Chida Aircraft Parts Manufacturing Co., Ltd., Shandong Dingchang Composite Materials Co., Ltd., Shaanxi West Yellow River Emerging New Materials Technology Co., Ltd. and Shandong Baiyuan Composite Materials Technology Co., Ltd.

The main drafters of this document are: Yuan Chongxin, Cui Hao, Ma Dan, Xin Meiyin, Tang Jiali, Liang Tingfeng, Lian Feng, Li Yongxing, Feng Yubo, Wu Huakai, Yan Shibo, Li Zhiyuan, Huang Xing, Huang Jia, Song Nan, Dang Lei, Wang Bin, Li Meng, Lu Xin, Dong Qinghai, Xie Weimin, Li Changtai, Li Zongqi, Jiang Bo, Zhang Yi, Pan Jie, Liu Wencheng, Leng Xibo, Li Ning, Gu Yongtao, Han Lixin, Gao Fengge, Xu Qi, Xiang Long, Zhao Baojun, Jing Xin, Sun Yanli, Zhou Jing, Xun Dianshun, Wang Zhimin, Liu Zhiang, and Chen Yun. carbon fiber composites Planar biaxial tensile test method for laminates

1 Scope

This document describes the principles, equipment and instruments, specimens, test conditions, and test methods of biaxial tensile testing of carbon fiber composite laminates.

Preparation, test steps, data processing and test report, etc.

This document is applicable to the in-plane biaxial tensile test of carbon fiber composite 0/90 cross-ply laminates.

2 Normative references

GB/T 40724

3 Terms and Definitions

The terms and definitions defined in GB/T 40724 apply to this document.

4 Principles

Apply an orthogonal tensile load parallel to the specimen plane to the cross-shaped specimen, and simultaneously and continuously measure the stress in the central test area of the cross-shaped specimen.

The maximum failure strain of the central test area in the X-axis direction, Y-axis direction and 45° direction is obtained.

5 Equipment and Instruments

5.1 Biaxial testing machine

The biaxial testing machine meets the following requirements.

a) Clamping end flatness. The centers of the four clamping ends should be located in the same plane, and the flatness error should not be greater than 0.1mm;

b) Loading coaxiality. The verticality error of two mutually perpendicular loading axes should be controlled within the range of ±0.1°; the two relative clamps on each axis should be controlled within the range of ±0.1°.

The coaxiality error of the head should be controlled within the range of ±0.1°;

c) Actuator configuration. should be equipped with four independently controlled actuators;

d) Control mode. It should have multiple control modes such as constant load ratio and constant displacement ratio;

e) Data recording function. It should be able to simultaneously record the force and displacement data of four channels over time;

f) Fixture requirements. Hydraulic or mechanical wedge-shaped fixtures should be used. During the test, the fixture should ensure that the specimen does not slip;

g) Alignment requirements. The fixture should ensure that the center position of the specimen is consistent with the center position of the testing machine when clamping, and the center deviation should not exceed 0.1mm.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 40724Terminology for carbon fiber and carbon fiber composites

Editions of GB/T 45877

Edition	Title	Revision	Status
GB/T 45877-2025	Carbon fiber composite materials - Method for planar biaxial tensile testing of laminates	current edition	Current

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