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Metallic material -- Determination of residual stress -- Hole drilling strain-gauge method
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GB/T 31310-2014
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Basic data | Standard ID | GB/T 31310-2014 (GB/T31310-2014) | | Description (Translated English) | Metallic material -- Determination of residual stress -- Hole drilling strain-gauge method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H22 | | Classification of International Standard | 77.040.10 | | Word Count Estimation | 42,471 | | Date of Issue | 12/5/2014 | | Date of Implementation | 9/1/2015 | | Quoted Standard | JJG 623 | | Regulation (derived from) | Announcement of Newly Approved National Standards 2014 No. 27 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Standard specifies Test Overview elastic material near the surface of the metal material isotropic linear residual stress using drilling method, measuring equipment, measurement procedures, stress calculations constant calibration, measurement error | GB/T 31310-2014: Metallic material -- Determination of residual stress -- Hole drilling strain-gauge method
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Metallic material. Determination of residual stress. Hole drilling strain-gauge method
ICS 77.040.10
H22
National Standards of People's Republic of China
Metallic material residual stress measurement method of borehole strain
Issued on. 2014-12-05
2015-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Introduction Ⅲ
Introduction Ⅳ
1 Scope 1
2 Normative references 1
3 Terms and definitions
4 Symbols and 2
5 3 Test Overview
6 7 Part Ready
7 rosette and measuring instruments 8
8 Test procedure 9
9 Calculation of Residual Stress 12
10 26 Test Report
11 Precision and Bias 26
Appendix A (normative) Calibration test low-speed drill and Formulas 29
Annex B (informative) Uncertainty drilling method of analysis 32
Results Appendix C (Informative Appendix) X-ray diffraction and drilling measurement of residual stresses than 35
References 36
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
The standard proposed by China Iron and Steel Association.
This standard by the National Steel Standardization Technical Committee (SAC/TC183) centralized.
This standard was drafted. Wuhan Iron and Steel (Group) Corporation, Institute of Metal Research, Shanghai Entry-Exit Inspection and Quarantine Bureau, Wuhan
the University.
The main drafters of this standard. IRON Chen Huaining, Wu Yiwen, coating should macros, Yu Li, Zhu Lihong, Qiubao Wen, Liu Dong, Xue Huan, Imperial Concubines
Wang selected country, Hou mass.
Introduction
Residual stress exists in almost all materials, are likely to produce residual stress in the workpiece during the manufacturing process or service. Especially for
Those artifacts alternating loads or corrosive environments in service, if there is no consideration or accounting residual stress in the design process, it turns
One of the important factors that cause material failure. Residual stress may also be useful, e.g., compressive stress generated by shot peening. Drilling Strain (under
Referred to as the drilling method) is a method for determining residual stresses.
Drilling method for measuring residual stress in an isotropic linear elastic material near the surface. Comprising the steps of. the strain put on the surface of the object
Flowers, then take the strain drilling, and then measure the object surface released strain. The measured strain can be substituted into a series of formulas
Calculate the material has been removed portion where the residual stresses.
Drilling method of destruction caused by the workpiece is limited to a smaller area, for thicker materials, not usually into Positive
Often use a serious impact, so called "semi-destructive" testing. In contrast, most other mechanical residual stress measurement methods will
Causing serious damage to the workpiece. Due to the number of drilling method will cause some damage to the workpiece, the method only for drilling on the workpiece
Hole (or after drilling through welding Buxiu mill) does not seriously affect its function under the case.
There are two different ways of measuring residual stress.
a) high-speed drilling residual stress measurement method, that method A.
Finite element analysis of stress due to the high-speed drill machining strain is small, residual stress measurement can be entirely in accordance with the formula obtained by Cauchy
Calibration constants are calculated.
b) low-speed drill residual stress measurement method, that method B.
Due to the low-speed drill work strain is relatively large, can not be ignored, the measurement of residual stress through stress comprehensive calibration tests obtained
Calibration constants calculated.
Theoretically, if the isotropic (isometric) residual stress exceeds 50% of the yield strength of the material, or in either direction shear stress exceeds the yield
25% of the strength of the service, may be due to the surrounding borehole stress concentration and localized yielding. But in practice there are reliable data show that the residual stress of not
More than 60% of the material yield strength of this standard can still use (this limit is only determined for non-square test calibration calibration constant stress
Method, Method A method of determining the. If the residual stress measurement of high material yield point, such as welding stress, at this time need a special set of
Test calibration techniques, such as the calibration method B) [2].
Metallic material residual stress measurement method of borehole strain
1 Scope
This standard specifies the test outlined determination of the elastic material near the surface of a metallic material isotropic linear residual stress using the drilling method, measurement devices
Equipment, measurement procedures, calibration constant stress calculation, measurement error correction and the like.
Drilling method for measuring the inner surface of the metal material stress gradient less stress state, the residual stress in this state may be in the depth direction
No change, approximately constant (uniform stress), there may be significant changes (non-uniform stress) in the depth direction. As a result of drilling only mode
Plane residual stress can be measured near the surface of the material, and therefore the size of the drilling method can only be measured by drilling holes in the inner boundary of the local residual stresses.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
JJG623 resistance strain gauges
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Stress calibration constants calibrationconstantforstresses
Information residual stress and strain release scale factor. In borehole strain method, the resistance strain gauge geometry, pasting position, the hole
The shape and size.
3.2
Strain Release relievedstrain
The structural member having a stress field drilling, the amount of change before and after its drilling strain.
3.3
Thin workpieces thinworkpiece
The thickness of the circular diameter smaller than the bore diameter of the workpiece or strain to spend.
3.4
Thick workpiece thickworkpiece
Many artifacts than the thickness of the large diameter drilling.
3.5
Medium thickness of the workpiece intermediatethicknessworkpiece
Thick and thin workpiece workpiece workpiece in between.
3.6
High-speed drilling high-speedhole-driling
Speed \u200b\u200binto the hole in the tens of thousands of revolutions per minute or more, cutting a small amount of processing methods.
3.7
Low-speed drill low-speedhole-driling
Pore-forming speed of thousands of revolutions per minute, especially a hand drill processing methods.
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