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GB/T 18658-2018 English PDF

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GB/T 18658-2018: Charpy V-notch reference test pieces for indirect verification of pendulum impact testing machines
Status: Valid

GB/T 18658: Historical versions

Standard IDUSDBUY PDFLead-DaysStandard Title (Description)Status
GB/T 18658-2018439 Add to Cart 4 days Charpy V-notch reference test pieces for indirect verification of pendulum impact testing machines Valid
GB/T 18658-2002439 Add to Cart 3 days Charpy V reference test pieces for verification of pendulum-type impact testing machines (ISO 148-3: 1998, Metallic materials -- Charpy pendulum impact test -- Part 3: Preparation and characterization of Charpy V reference test pieces for verification of Obsolete

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Basic data

Standard ID: GB/T 18658-2018 (GB/T18658-2018)
Description (Translated English): Charpy V-notch reference test pieces for indirect verification of pendulum impact testing machines
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: N71
Classification of International Standard: 19.060; 77.040.10
Word Count Estimation: 22,214
Date of Issue: 2018-07-13
Date of Implementation: 2019-02-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 18658-2018: Charpy V-notch reference test pieces for indirect verification of pendulum impact testing machines


---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.
Charpy V-notch reference test pieces for indirect verification of pendulum impact testing machines ICS 19.060; 77.040.10 N71 National Standards of People's Republic of China Replace GB/T 18658-2002 Pendulum impact tester for indirect inspection Charpy V-notch standard specimen (ISO 148-3.2008, Metalicmaterials-Charpypendulumimpacttest- Part 3.PreparationandcharacterizationofCharpyV-notchtestpieces Forindirectverificationofpendulumimpactmachines, MOD) 2018-07-13 released.2019-02-01 implementation State market supervision and administration China National Standardization Administration issued

Content

Foreword I Introduction III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 symbols and abbreviations 2 5 standard testing machine 3 6 standard sample 6 7 Standard test certificate 7 8 Precautions for using the standard sample set 7 Appendix A (informative) Uncertainty of the calibration energy (KV) value of the Charpy impact standard sample 11 Reference 17

Foreword

The national standard for the Charpy pendulum impact test series of metallic materials consists of the following three separate standards. ---GB/T 229 metal material Charpy pendulum impact test method; ---GB/T 3808 pendulum impact tester inspection; ---GB/T 18658 Pendulum impact tester for indirect inspection with Charpy V-notch standard specimens. This standard is one of the national standards of this series. This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 18658-2002 "Charpy impact tester for Charpy V-notch standard test", and Compared with GB/T 18658-2002, the main technical changes are as follows. --- Modified the name; --- Turned the last two paragraphs of Chapter 1 into two notes (see Chapter 1, Chapter 1 of the.2002 edition); --- Updated the national standards cited in the list of normative references (see Chapter 2, Chapter 2 of the.2002 edition); ---Divided into four categories and renumbered, modified the definition of individual terms (see Chapter 3,.2002 edition) Chapter 3); The --- symbol has been increased from 3 to 36. Among them, the two symbols "b" and "BV" have been added to the standard, and eight abbreviations have been added. Will be able to The basic symbol of the quantity is changed from the original "A" to "K" (see Chapter 4, Chapter 4 of the.2002 edition); ---Adjusted the structure of Chapters 5 and 6 and rewritten the article number (see Chapters 5 and 6, Chapter 5 of the.2002 edition and Chapter 6); --- Added the informative Appendix A "The uncertainty of the calibration energy (KV) value of the Charpy impact standard sample" (see Appendix A); --- Added references. This standard uses the redrafting method to modify the international standard ISO 148-3.2008 "Metal material Charpy pendulum impact test" Part 3. Preparation and Characteristics of Charpy V-notch Specimens for Indirect Inspection of Pendulum Impact Tester. The technical differences between this standard and ISO 148-3.2008 and their reasons are as follows. --- Regarding the normative reference documents, this standard has made technical adjustments to adapt to the technical conditions of China, within the adjustment The content is reflected in Chapter 2, “Regulatory References”, and the specific adjustments are as follows. ● Replace ISO 148-1 with GB/T 229 modified to adopt international standards; ● Replaced ISO 148-2 with GB/T 3808 modified to international standards. --- Increased the scope of application. --- Delete the positive sign " " or minus " ―" before the deviation of the dimension deviation or the lower deviation of "0" in Table 2. --- Added two symbols "b" and "BV" to the header of Table 3, before the technical specification of the third column "Maximum allowable indication error" Added the sign "±". There are technical differences between this standard and ISO 148-3.2008, and the terms involved in these differences have been passed on the outer margins of the margins. The vertical single line (│) is marked. This standard also made the following editorial changes. --- In line with the existing standard series, the standard name was changed to "Charpy V-notch standard for indirect inspection of pendulum impact tester" Sample". Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying these patents. This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Testing Machine Standardization Technical Committee (SAC/TC122). This standard was drafted. Changchun Machinery Science Research Institute Co., Ltd., Xiamen Yuhua Testing Technology Co., Ltd., Guangzhou University, Wu Zhongsi Dimensional Material Testing Machine Co., Ltd. The main drafters of this standard. Wang Xuezhi, Guo Bing, Xu Zhonggen, Wang Shiwei. The previous versions of the standards replaced by this standard are. ---GB/T 18658-2002.

Introduction

The suitability of a pendulum impact tester for metal material acceptance testing is usually based on calibration and sizing of its dial Qualitative tests, such as the detection of the shape and span of the support sample anvil. Calibration of the dial is generally done by measuring the mass of the pendulum and Check the pendulum lift for the different readings on the dial. The outstanding advantage of this method of evaluating the impact tester is that only the measurement is traceable to The amount of national benchmarks. The authenticity of these traceability measurements reduces the need to arbitrate for the suitability of the impact tester for material acceptance testing. Essential. However, when testing samples of the same material, it is sometimes found that it is evaluated by the direct test described above and meets all dimensional requirements. The two test machines gave distinct impact values. The value measured by one test machine satisfies the technical requirements of the material, while the other The measured value does not meet the requirements, and this difference is commercially important. In order to avoid this difference, the buyer of certain materials will mention Additional requirements. all impact testing machines sold to them for material acceptance testing are subject to the standard test specimens provided by the buyer. Conduct an indirect test. Within the specified limit values, only the value measured by the test machine is the same as the value given by the standard sample. Can be received. GB/T 3808 draws on the successful experience of using standard samples, and proposes that in addition to direct inspection, standard samples should be used for indirect inspection. Inspection requirements. This standard is intended to specify the requirements, preparation and identification methods for standard specimens for indirect testing of pendulum impact testing machines. Pendulum impact tester for indirect inspection Charpy V-notch standard specimen

1 Scope

This standard specifies the technical requirements, preparation and inspection of standard specimens for indirect inspection of pendulum impact test machines in accordance with GB/T 3808. Method. The notched specimens described in this standard and their nominal dimensions are strictly inferior to those specified in GB/T 229. This standard is applicable to standard samples for indirect inspection of pendulum impact testers in accordance with GB/T 3808. Note 1. The expected energy levels of the samples are different, and their chemical composition and/or heat treatment are different. Note 2. This standard also describes a pendulum type standard impact tester for the verification of standard samples.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 229 Metallic material Charpy pendulum impact test method (GB/T 229-2007, ISO 148-1.2006, MOD) Inspection of GB/T 3808 pendulum impact tester (GB/T 3808-2018, ISO 148-2.2008, MOD)

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Terms relating to testing machines 3.1.1 Work test machine industrialmachine A pendulum impact tester for metal material testing in industrial, general laboratories or most research laboratories. Note. These test machines are not used to establish standard values. 3.1.2 Standard test machine referencemachine A pendulum impact tester for determining the energy absorption calibration value of each batch of standard samples. 3.2 Terms related to energy 3.2.1 Total absorbed energy totalabsorbedenergy KT The total absorbed energy required to break the specimen using a pendulum impact tester that has not corrected any energy loss. Note. This energy is equal to the difference between the potential energy of the pendulum at the initial position and the potential energy at the end of the first half-swing period after the pendulum swings. 3.2.2 Absorbing energy absorbedenergy The energy required to break the specimen using a pendulum impact tester that has been corrected for frictional energy loss. Note. The letter V or U is used to indicate the geometry of the gap, ie KV or KU. The number under the corner 2 or 8 is used to indicate the radius of the impact edge, such as KV2. 3.2.3 Standard absorbed energy referenceabsorbedenergy KR The calibration value of the absorbed energy given to the standard sample for the performance test of the pendulum impact tester. 3.3 Terms related to sample groups 3.3.1 Batch batch A certain number of standard samples having the same standard absorbed energy, manufactured under the same production conditions. 3.3.2 Group set A sample set randomly selected from a batch of samples. 3.3.2.1 Characteristic group characterizationset A sample set taken from a batch of samples and used to determine the standard energy of the batch of samples as specified in Chapter 6. 3.3.2.2 Standard group referenceset A sample set selected in accordance with Chapters 6 and 8 and used to inspect the pendulum impact tester. 3.4 Terminology related to the sample 3.4.1 Height height The distance between the face with the notch and the face opposite it. 3.4.2 Width width A dimension parallel to the notch and perpendicular to the height direction. 3.4.3 Length length The largest dimension perpendicular to the direction of the notch. 3.4.4 Standard sample referencetestpiece By comparing the absorption energy measured by the pendulum impact tester with the standard absorbed energy value indicated by the impact standard sample In comparison, an impact specimen for testing the suitability of a pendulum impact tester. 3.4.5 Certified standard sample certified referencetestpiece A certificate with a standard absorption energy value KR is given and an impact specimen containing the uncertainty of the probability measurement is specified. Note. The standard value of a certified standard sample is a value determined by an accredited national or international agency.

4 symbols and abbreviations

The symbols and abbreviations given in Table 1 apply to this document. Table 1 Symbols and abbreviations and their meanings and units Symbol and Abbreviations Unit meaning BV J Indication error of pendulum type standard impact tester determined by indirect test b J pendulum type standard impact tester indication repeatability CRM - Certified Reference Material GUM - Guide to Measurement Uncertainty ISO - International Organization for Standardization KJ absorbs energy KT J total absorbed energy Standard absorption energy of the KR J Charpy standard sample set KV J Absorbed energy measured by V-notch specimen according to GB/T 229 test method KVchar J Absorbed energy (KV) value of a batch of Charpy V-notch standard specimens (standard materials) measured in batch characterization experiments KVPB J Calibration first energy (KV) value of the first (PB) standard sample Standard absorption energy (KV) value of the KVR J Charpy V-notch standard sample set Calibration absorbed energy (KV) value of KVSB J batch (SB) standard sample k - contains factor Nhom - number of samples used for homogeneity assessment trials nPB - Number of first (PB) samples taken in comparison with the first batch (SB) and the first batch (PB) nSB - Number of sub-batch (SB) samples taken from the comparison between the first batch (SB) and the first batch (PB) nV - Number of standard samples for indirect test of pendulum impact tester PB - first batch p - number of laboratories or test machines participating in the laboratory comparison REMCO - Standard Substance Committee of the International Organization for Standardization (ISO ) RM - Reference material SB - sub-batch sP J Standard deviation of mean absorbed energy (KV) values obtained from p laboratories sPB J Standard deviation of test results obtained by comparing nPB first batch samples with nSB sub-batch samples sRM J Standard deviation of absorbed energy (KV) values obtained from nhom samples for standard sample batch homogeneity evaluation Uchar J Standard uncertainty of the absorbed energy value (KVchar) of the Charpy V-notch standard sample batch measured by characterization experiment Uchar, PB J Standard uncertainty of the absorbed energy value (KVchar) of the first batch (PB) standard sample batch measured by characterization experiment Uchar, SB J Standard uncertainty of the absorbed energy value (KVchar) of the sub-batch (SB) standard sample batch measured by the characterization experiment Standard uncertainty for the evaluation of homogeneity of uhom J standard samples Standard uncertainty for long-term stability evaluation of ults J standard specimens uRM J Standard test for indirect test calibration of the standard uncertainty of absorbed energy values URM J contains extended uncertainty of the nominal absorbed energy value of a standard sample with a probability of approximately 95% Standard uncertainty for short-term stability evaluation of usts J standard specimens Table 1 (continued) Symbol and Abbreviations Unit meaning uXPB J XPB standard uncertainty uXSB J XSB standard uncertainty XPB J Average of absorbed energy measured by sub-batch and nPB samples from the first batch of comparative tests The average value of the absorbed energy measured by XSB J through the nB batches of the first batch and the first batch of comparative tests. δKVhom J The error portion of the absorbed energy measurement produced by the batch heterogeneity δKVlts J Error portion of the absorbed energy measurement due to long-term stability δKVsts J Error portion of the absorbed energy measurement due to short-term stability Νchar - the degree of freedom corresponding to uchar Νhom - the degree of freedom corresponding to uhom νRM - the degree of freedom corresponding to uRM

5 standard testing machine

5.1 Performance 5.1.1 General requirements The performance of a standard test machine used to determine the standard energy of a standard test shall be in accordance with GB/T 3808, except for the following modified terms. Various requirements. 5.1.2 Geometric characteristics The geometrical characteristics of each part of the standard test machine are shown in Table 2, Figure 1 and Figure 2; the following geometric characteristics shall comply with the provisions of this article. a) the anvil fillet radius should be 1 0.10 0 mm; b) The span of the anvil should be 40 0.10 0 mm; c) The impact edge of the pendulum shall be within ±0.25 mm of the symmetry plane of the anvil. Table 2 Geometric characteristics The dimension number a in the figure means the dimensional tolerance unit 1 sample length 55.00 0*-0.30 mm 2 Half length of the specimen 27.5 ± 0.2* mm 3 sample height 10.00 ± 0.06 mm 4 sample width 10.00 ±0.07* mm 5 The cross-sectional height of the notch is 8.00 ± 0.06 mm 6 Notch angle 45.0 ±1.0* degrees (°) 7 Notch bottom radius of curvature 0.250 ±0.025 mm Table 2 (continued) The dimension number a in the figure means the dimensional tolerance unit 8 The angle between adjacent faces is 90.00 ± 0.15* degrees (°) 9 The angle between the symmetry plane of the notch and the longitudinal axis is 90 ± 2 degrees (°) 10 Anvil fillet radius 1.00 0.10* 0 mm 11 Anvil slope angle 11 ± 1.0 degrees (°) 12 Span span 40.00 0.10* 0 mm 13 Distance of the pendulum impact blade to the symmetry plane of the anvil - ±0.25* mm 14 Impact edge angle 30 ± 1 degree (°) 15A 2mm impact edge radius of curvature 2.00 0.20* 0 mm 15B 8mm impact edge radius of curvature 8.00 ± 0.05 mm 15C 8mm impact blade shoulder angle radius 0.25 ± 0.05 mm 15D 8mm impact edge blade width 4.00 ± 0.05 mm Note 1. The tolerances with an asterisk (*) are tighter than those in GB/T 229 or GB/T 3808. Note 2. Small-sized specimens may be used, but the tolerances should be changed proportionally. Note 3. See Figure 1 and Figure 2. a See Figure 1. 5.1.3 Energy The energy of the standard test machine (nominal initial potential energy) should be no less than 300J. 5.1.4 Hardness The portion where the impact blade and the anvil contact the specimen and exert or withstand the impact force (see Figure 1) shall have a Rockwell hardness of not less than 56 HRC. 5.1.5 Vibration Ensure that the standard test machine is not subject to external vibrations caused by other nearby equipment such as hammers, punches or moving vehicles. Note. The small container filled with water can be used to detect such vibrations. If the water surface does not fluctuate, it means that the above requirements have been met. begging. If the standard machine firmly fixed to the ground has excessive vibration, it indicates that a separate foundation and/or vibration isolators are required. 5.1.6 Energy indicating device The lowest resolution of the energy indicating device should be 1/400 of the nominal energy. 5.2 Inspection of standard testing machine The standard test machine shall be directly inspected in accordance with the additional requirements of GB/T 3808 and 5.1. Indirect inspection of standard test machines should be performed using certified standard samples. The repeatability and error should be in accordance with Table 3. All instruments used for inspection and inspection of standard test machines shall be calibrated and shall be capable of demonstrating the legal The bit is traceable. The organization conducting the inspection shall maintain a calibration record of all inspection, measurement and testing equipment. The date and details of all inspections and repairs for each standard test machine shall be documented and shall be the owner of the test machine save. Table 3 The repeatability and indication error of the standard test machine are in joules. Absorb energy Reproducibility Maximum allowable indication error BV < 40 ≤3 ±2 ≥40 ≤7.5% KVR ±5% KVR The indication repeatability b is the standard deviation of the KVnV values measured on at least 10 standard samples. The indication error BV is calculated as follows. BV=KV-KVR In the formula. KV= KV1V KV2V KV3V KVnV nV (nV≥10) 5.3 Use of standard test machine 5.3.1 The operation method of the standard test ......
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