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Test method for fracture toughness of aluminium alloy products
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Basic data
| Standard ID | GB/T 42914-2023 (GB/T42914-2023) |
| Description (Translated English) | Test method for fracture toughness of aluminium alloy products |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | H22 |
| Classification of International Standard | 77.040.10 |
| Word Count Estimation | 42,442 |
| Date of Issue | 2023-08-06 |
| Date of Implementation | 2024-03-01 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 42914-2023: Test method for fracture toughness of aluminium alloy products
---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 77.040.10
CCSH22
National Standards of People's Republic of China
Test method for fracture toughness of aluminum alloy products
Published on 2023-08-06
2024-03-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Table of contents
PrefaceⅠ
1 Scope 1
2 Normative reference documents 1
3 Terms and Definitions 1
4 Method Overview 1
5 Test conditions 2
6 Instruments and Equipment 2
6.1 Testing machine 2
6.2 Fatigue pre-crack equipment 2
6.3 Extensometer 2
6.4 Test fixture 3
6.5 Anti-warping device 5
7 Plane strain fracture toughness test method 5
7.1 Sample 5
7.2 Test Step 15
7.3 Test data processing 18
7.4 Result processing and result presentation 20
8 Plane stress fracture toughness test method 22
8.1 Test method using centrally cracked specimen 22
8.2 Test method using compact tensile specimens 31
8.3 Result processing and result presentation 34
9 Test Report 34
9.1 Plane strain fracture toughness test 34
9.2 Plane stress fracture toughness test 35
Appendix A (normative) Extensometer linearity test method 36
Reference 38
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 be subject to patents. The publisher of this document assumes no responsibility for identifying patents.
This document is proposed by the China Nonferrous Metals Industry Association.
This document is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243).
This document was drafted by. Southwest Aluminum (Group) Co., Ltd., National Standard (Beijing) Inspection and Certification Co., Ltd., Nonferrous Metal Technology
Economic Research Institute Co., Ltd., Chinalco Materials Application Research Institute Co., Ltd., Northeast Light Alloy Co., Ltd., Tianjin Zhongwang Aluminum Co., Ltd.
Company, Guangxi Nannan Aluminum Processing Co., Ltd., Youyan Engineering Technology Research Institute Co., Ltd., Shanghai Aviation Materials Structure Testing Co., Ltd.,
Shandong Nanshan Aluminum Co., Ltd., China Ordnance Equipment Group No. 59 Research Institute Co., Ltd., CRRC Qingdao Sifang Rolling Stock Co., Ltd.
Co., Ltd., Central South University, Shanghai Jiao Tong University.
The main drafters of this document. Xiao Hong, Wu Lei, Ge Lixin, Chen Jie, Peng Zhujun, Qian Weifeng, Hu Tianlong, Song Zixun, Wei Xiuxun, Yan Lizhen,
Liu Jianzhong, Chen Wen, Song Wencheng, Wang Hui, Wang Chou, Deng Yunlai, Xu Jijin.
Test method for fracture toughness of aluminum alloy products
1 Scope
This document describes a test method for the fracture toughness of aluminum alloy products.
This document is applicable to the plane strain fracture of aluminum alloy rolled plates, extruded bars, extruded plates, extruded pipes, extruded profiles and forging products.
Determination of fracture toughness and plane stress fracture toughness.
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document.
GB/T 8170 Numerical rounding rules and expression and determination of limit values
GB/T 10623 Terminology for mechanical properties testing of metal materials
GB/T 12160-2019 Calibration of extensometer systems for uniaxial testing of metallic materials
GB/T 16825.1-2022 Inspection and calibration of static uniaxial testing machines for metallic materials Part 1.Tensile and/or pressure testing
Inspection and Calibration of Inspection Machine Force Measuring System
JJG475 electronic universal testing machine
JJG556 axial force fatigue testing machine
JJG762 extensometer
JJG1063 Electro-hydraulic servo universal testing machine
3 Terms and definitions
The terms and definitions defined in GB/T 10623 apply to this document.
4 Method overview
Fatigue cracks were preformed on specimens with machined notches through cyclic loading, and specimens with sharp cracks were subjected to stress perpendicular to the crack plane.
When pulling force, the crack tip will undergo a small range of plastic deformation. Usually, the plastic zone of the crack tip of the sample includes the internal plane strain zone and the surface.
Plane stress zone. If the thickness of the sample is small enough, the plane strain zone can be ignored, the crack tip is approximately in a plane stress state, and the plane strain can be measured.
Surface stress fracture toughness, the proportion of plane strain zone increases with the increase of sample thickness. When the sample thickness increases to a certain extent, the crack tip
The end is approximately in a plane strain state, and the plane strain fracture toughness can be measured. Fracture toughness tests are divided into two categories.
---Plane stress fracture toughness test. measured using a central crack specimen or a compact tensile specimen with a width-to-thickness ratio greater than 4
Plane stress fracture toughness (KC), apparent plane stress fracture toughness (Kapp) or crack propagation resistance strength factor of aluminum alloy materials
sub(KR);
---Plane strain fracture toughness test. Determination of aluminum alloy materials using compact tensile specimens with a ratio of width to thickness between 2 and 4
...
