GB/T 43112-2023 English PDF

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GB/T 43112-2023: Metallic materials - Elastic modulus measurement - Rate-jump method
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Basic data

Standard ID: GB/T 43112-2023 (GB/T43112-2023)
Description (Translated English): Metallic materials - Elastic modulus measurement - Rate-jump method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H22
Classification of International Standard: 77.040.10
Word Count Estimation: 14,179
Date of Issue: 2023-09-07
Date of Implementation: 2024-04-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 43112-2023: Metallic materials - Elastic modulus measurement - Rate-jump 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 77.040.10 CCSH22 National Standards of People's Republic of China Rate jump method for measuring elastic modulus of metallic materials Published on 2023-09-07 2024-04-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Committee

Table of contents

PrefaceⅠ Introduction II 1 Scope 1 2 Normative reference documents 1 3 Terms and Definitions 1 4 symbol 2 5 Principle 2 6 Testing machine 3 7 Sample 3 8 Test procedure 3 9 Calculation of elastic modulus 4 10 Test report 5 Appendix A (Informative) Rate Jump Method Theory 6 Appendix B (informative) Press-in creep effect 9 Reference 10

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 Iron and Steel Industry Association. This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). This document was drafted by. University of Hong Kong, Southern University of Science and Technology, Guangzhou Zhujiang Machine Tool Factory Co., Ltd., Metallurgical Industry Information Standard Research Institute, Shenzhen Wandian Testing Equipment Co., Ltd., Dongguan Advanced Institute of Materials Science and Technology, and Southwest Jiaotong University. The main drafters of this document. Yan Qingyun, Tang Bin, Xie Jianmin, Dong Li, Hou Xiaodong, Huang Xing, Cai Lixun, Pang Xiangchao, Huang Kejian, Hou Huining.

Introduction

Elastic modulus is one of the important mechanical indicators to measure material performance. Accurate measurement of material elastic modulus requires effective technical means. One of the current effective and convenient methods to obtain the elastic modulus of materials is the quasi-static instrumented press-in test based on the Hertz and Oliver-Pharr models. This method is mainly applicable to many hard materials. However, for various types of soft metals or metals at high temperatures, due to obvious Creep/viscoelastic phenomena, elastic modulus test results during quasi-static loading or unloading will be affected by the loading or unloading rate. In addition, move The state load spectrum method is also a common elastic modulus testing method, but the storage and loss modulus measured by this method are also related to the test platform and test time. related to the loading frequency. These traditional methods are not suitable for various types of soft metals or high-temperature metals. For metallic materials whose deformation is only viscoelastic or elastic, the intrinsic elastic modulus can be measured by this standard. The main purpose of this document is to The rate jump of test force or depth is introduced during the unloading process of overpressure test to measure the intrinsic elastic modulus of the material. Rate jump method for measuring elastic modulus of metallic materials

1 Scope

This document specifies the principles, testing machines, specimens, test procedures, and elastic modulus specifications for testing the intrinsic elastic modulus of metallic materials using the rate jump method. Calculations and test reports. This document is suitable for testing the elastic modulus of metal materials using the instrumented intrusion method under test force control or displacement control, especially when there are Metal materials with obvious creep phenomenon. Other non-metallic solid materials can refer to this document.

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 10623 Terminology for mechanical properties testing of metal materials GB/T 21838.1-2019 Instrumented press-in test for hardness and material parameters of metallic materials Part 1.Test methods GB/T 21838.2 Instrumented indentation testing of metallic material hardness and material parameters Part 2.Inspection and calibration of testing machines

3 Terms and definitions

The terms and definitions defined in GB/T 10623 and the following apply to this document. 3.1 The inherent elastic modulus of metal materials that is not affected by test conditions such as loading and unloading rates. 3.2 rate jump rate-jump During the press-in process, test for sudden changes in force rate or depth rate after starting to unload. Note. An example of the preset load process for the push-in test with a content rate jump is shown in Figure 1a). 3.3 Contact stiffnesscontactstiffness The unloading curve is the change rate of the test force F relative to the indentation depth h at the maximum test force (S=dF/dh). 3.4 Se The contact stiffness (3.3) when the specimen creep returns to zero at the maximum test force of the unloading curve. Note. At this time, the sample material shows a purely elastic response and is not affected by the unloading rate. ......

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