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Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 3808-2018: Verification of pendulum-type impact testing machines Status: Valid GB/T 3808: Historical versions
Basic dataStandard ID: GB/T 3808-2018 (GB/T3808-2018)Description (Translated English): Verification of pendulum-type 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: 38,395 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 3808-2018: Verification of pendulum-type 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.Verification of pendulum-type impact testing machines ICS 19.060; 77.040.10 N71 National Standards of People's Republic of China Replace GB/T 3808-2002 Inspection of pendulum impact tester (ISO 148-2.2008, Metalicmaterials-Charpypendulumimpacttest- Part 2. Verificationoftestmachines, MOD) Published on.2018-07-13 Implementation of.2019-02-01 State market supervision and administration China National Standardization Administration issued ContentForeword I Introduction III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 3.1 Terminology relating to testing machine 2 3.2 Terminology related to energy 2 3.3 Terminology related to the sample 3 4 symbols and abbreviations 3 5 testing machine 5 6 direct inspection 5 6.1 General requirements 5 6.2 Basic and/or installation 6 6.3 Rack 6 6.4 pendulum 7 6.5 Anvil and support 9 6.6 indicating device 9 7 Indirect inspection using standard specimens 10 7.1 Use of standard specimens 10 7.2 Energy absorption level 10 7.3 Requirements for standard specimens 10 7.4 Simple and straightforward inspection 10 7.5 Error and repeatability 11 8 inspection cycle 11 9 Inspection report 12 9.1 General requirements 12 9.2 Direct inspection 12 9.3 Indirect inspection 12 10 uncertainty 12 Appendix A (informative) Measurement uncertainty of test machine indirect test results 18 Appendix B (informative) Measurement uncertainty of direct test results of test machines 21 Appendix C (informative) Direct test method for detecting geometrical characteristics of test machines using angle gauges 26 Appendix D (informative) Arc and rectangular impact specimens 31 Reference 33ForewordThe 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 3808-2002 "Inspection of pendulum impact tester", compared with GB/T 3808-2002, the main technology The changes are as follows. --- Revised the terminology and definition of energy (see 3.2, 3.2 of.2002); --- Adjusted the terms and definitions related to the sample (see 3.3, 3.3, 3.4 of.2002); --- Modified symbols and abbreviations (see Chapter 4, Chapter 4 of the.2002 edition); --- Added Appendix A, Appendix B, Appendix C, Appendix D (see Appendix A, Appendix B, Appendix C, Appendix D). This standard uses the redrafting method to modify the use of ISO 148-2.2008 "Metal material Charpy pendulum impact test part 2. test Machine inspection. The technical differences between this standard and ISO 148-2.2008 and their reasons are as follows. --- Regarding the normative reference documents, this standard has been adjusted with technical differences 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; ● Replace ISO 148-3 with GB/T 18658 modified to international standards; --- Turn the note of 6.3.6 in ISO 148-2.2008 into a clause so that the required clause in the original note complies with GB/T 1.1- The provisions of.2009; --- Removed the numbering of 6.4.5.1, 6.4.5.2 and 6.4.5.3 in ISO 148-2.2008, and changed the note in the original 6.4.5.2 into a For the text, the original texts 6.4.5.1, 6.4.5.2 and the provisions of the notes are expressed in terms of the items, and the provisions of the original text 6.4.5.3 become the standard. Clause 6.4.5, in order to make the suspension paragraphs appearing in the original text and the provisions with the requirements in the note comply with the provisions of GB/T 1.1-2009, At the same time, the original numbers "6.4.5.1 and 6.4.5.2" quoted in 8.3 of this standard are modified to "6.4.5a" and 6.4.5b)"; --- Added the guidance for the following items in the B.2.3 Chinese formula (B.17) of ISO 148-2.2008; --- The "pendulum axis" described in footnote form in Figure 4 of ISO 148-2.2008 is indicated by the number 5 and the footnote form is used in the figure. The angle symbols "α" and "β" of the description are replaced by direct description of the symbols to comply with the national standards for technical drawings. For ease of use, the following editorial changes have been made to this standard. --- In line with the existing standard series, change the standard name to "Inspection of pendulum impact tester"; --- Removed the numbering of 8.3.1 and 8.3.2 of ISO 148-2.2008, and stated the provisions of the original texts 8.3.1 and 8.3.2 as listed. So that the suspension segment appearing in the original text meets the requirements of GB/T 1.1-2009; --- Added the informative Appendix D "Arc-type, rectangular impact specimens". There are technical differences between this standard and ISO 148-2.2008, and the terms involved in these differences have been passed in the margins of their outer margins. The vertical single line (|) is marked. 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., Wuzhong Siwei Material Testing Machine Co., Ltd., Jinhua Gold Test Machine Co., Ltd., Jinan Times Test Instrument Co., Ltd., Xiamen Huajian Testing Technology Co., Ltd., Weihai Test Machine Manufacturing Co., Ltd. Nankehui Test Equipment Co., Ltd., Hangzhou Bearing Test Research Center Co., Ltd., Zhejiang Jingdun Auto Parts Manufacturing Co., Ltd., Steel Research General Institute. The main drafters of this standard. Chen Hongcheng, Wang Shiwei, Jia Lizhen, Chen Yingkun, Wan Feng, Yu Cuirong, Shi Weidong, Li Xinglin, Hong Jinkun, Wang Chunhua. The previous versions of the standards replaced by this standard are. ---GB/T 3808-1983, GB/T 3808-1995, GB/T 3808-2002.IntroductionThe 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. Inspection of pendulum impact tester1 ScopeThis standard specifies the inspection method for the components of the pendulum impact tester. This standard applies to impacts with 2mm or 8mm The blade is subjected to a pendulum impact tester (hereinafter referred to as a test machine) for pendulum impact test according to the test method specified in GB/T 229. This standard can be applied to similar testing machines of other energies and different structures. The test machine used in the general laboratory or research laboratory engaged in the detection of metal materials in the industry is in accordance with the provisions of this standard. Testing Machine. Some of the more demanding testing machines are called standard impact testing machines. GB/T 18658 specifies the relevant standard punch The technical requirements for testing the test machine. This standard describes two methods of inspection. a) Direct test method. The nature of the method is a static test method, that is, by measuring the key components of the test machine to ensure that it is full The requirements of this standard. The inspection and calibration instruments used should demonstrate traceability to national benchmarks. When the test machine is installed, repaired or When the test method gives an unqualified result, it shall be inspected by direct test method; b) Indirect test method. The nature of the method belongs to the dynamic test method, that is, the test sample is used to check the points on the scale of the indicator device. Indication. For test machines that do not meet the requirements of this standard, both direct test and indirect test methods shall be used to test and fill The requirements of Chapters 6 and 7. GB/T 18658 specifies the technical requirements for standard specimens. The indirect test method specified in this standard considers the total energy absorbed by the sample during the fracture process. The total absorbed energy includes. ---The energy required to break the sample itself; --- The pendulum swings from the initial position to the energy loss inside the test machine when the first half cycle is completed. Note. Internal energy loss is due to. --- Air resistance, the friction of the pendulum shaft bearing and the friction caused by the friction of the pointer. These energy losses can be determined by direct test (see 6.4.5); --- The damage caused by the impact of the foundation, the vibration of the frame and the pendulum, there is no proper measurement method and measuring instrument for determining these energy losses.2 Normative referencesThe 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) GB/T 18658 pendulum impact tester for indirect inspection with Charpy V-notch standard specimen (GB/T 18658-2018, ISO 148-3.2008, MOD)3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Terms relating to testing machines 3.1.1 Anvil anvil The portion of the test machine that is used to properly position the sample relative to the impact blade and the sample holder and support the sample under impact. 3.1.2 Base base The portion of the test machine frame below the horizontal support surface of the sample holder. 3.1.3 Strike center centerofpercussion a point on the pendulum, the effect of striking the specimen at that point and the total mass of the pendulum if concentrated at that point The effects of the strike are the same (see Figure 4). Note. When the single pendulum strikes through the strike center along the horizontal line, the pendulum axis does not produce a horizontal reaction force. 3.1.4 Blow point centerofstrike Place a specimen or equivalent gauge with a height of half the standard height (ie 5 mm) on the specimen holder, and punch the pendulum in the free suspension position. The point on the blade that is in contact with the upper level of the specimen or gauge (see Figure 4). 3.1.5 Work test machine industrialmachine Testing machines for metal materials testing in industrial, general laboratories or most research laboratories. Note 1. These test machines are not used to establish standard values. Note 2. The working test machine is tested using the method specified in this standard. 3.1.6 Standard test machine referencemachine A testing machine for determining the energy absorption calibration value of each batch of standard samples. 3.1.7 Impact blade striker The portion of the pendulum that contacts the specimen (see Figure 2). Note. The impact blade of the actual contact sample can have a 2mm radius (2mm impact edge) or a 8mm radius (8mm impact edge). 3.1.8 Sample holder testpiecesupports The part of the test machine used to position the specimen correctly with respect to the pendulum strike center, the impact edge and the anvil (see Figures 2 and 3). 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 test machine that has not been corrected for 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 (see 6.3). 3.2.2 Initial potential energy initialpotentialenergy Potential energy KP The difference between the potential energy of the initial position before the pendulum is released and the potential energy of the pendulum at the impact position measured by the direct test method. Note. See 6.4.2. 3.2.3 Absorbing energy absorbedenergy The energy required to break the specimen using a test machine that has been corrected for frictional energy loss. Note. The letters V and U are used to indicate the geometry of the gap, such as KV or KU. The number under the corner 2 or 8 is used to indicate the radius of the impact blade. Such as KV2. 3.2.4 Calculating energy calculatedenergy Kcalc The value of the energy calculated from the angle, length and force values measured by the direct test method. 3.2.5 Initial potential energy nominal value nominalinitialpotentialenergy Energy nominal nominalenergy KN The energy value given by the test machine manufacturer. 3.2.6 Absorption energy indication indicatedabsorbedenergy KS The test machine indicates the energy value indicated by the device. The indication value may be that the friction energy loss of the measured absorption energy value K is required to be repaired. A positive value can also be a value that does not need to be corrected. 3.2.7 Standard absorbed energy referenceabsorbedenergy KR The calibration value of the absorbed energy given to the standard sample for testing the performance of the test machine. 3.3 Terminology related to the sample 3.3.1 Height height The distance between the face with the notch and the face opposite it. 3.3.2 Width width A dimension parallel to the notch and perpendicular to the height direction. 3.3.3 Length length The largest dimension perpendicular to the direction of the notch. 3.3.4 Standard sample referencetestpiece By comparing the measured value of the absorbed energy measured by the testing machine with the standard absorbed energy value indicated by the impacted standard sample, for testing Suitable for impact test specimens. Note. Standard samples are prepared in accordance with the requirements of GB/T 18658.4 symbols and abbreviationsThe symbols and abbreviations given in Table 1 apply to this document. Table 1 The meanings and units of symbols and abbreviations Symbol/abbreviation a unit meaning BV J The indication error of the test machine measured by indirect inspection b J test machine indication repeatability The force of the pendulum measured by FN at a distance l2 Fg N The force of the pendulum due to gravity Gm/s2 gravity acceleration GUM - Guide to Measurement Uncertainty Hm pendulum drop height H1 m pendulum rise height ISO - International Organization for Standardization KV J Absorbed energy of V-notch specimens measured in accordance with GB/T 229 KVR J Standard Absorbed Energy (KV) value of standard specimens used in indirect testing KVV J The average value of the quasi-absorption energy (KV) of the standard sample used in the indirect test KN J Initial potential energy value (energy nominal value) KP J initial potential energy (potential energy) Standard absorption energy of the KR J Charpy standard sample set KJ Absorbed energy (expressed as KV2, KV8, KU2, KU8 to determine the specific notch geometry) And impact blade radius) KT J total absorbed energy KS J absorption energy indication Kcalc J calculated energy value K1 or β1 J or degree (°) When the sample is not placed on the support and is operated normally, the absorbed energy or angle indicated by the test machine K2 or β2 J or degree (°) When the sample is not placed on the support, the indicating device is not reset and the operation is normal, the absorption indicated by the test machine Energy or angle K3 or β3 J or degree (°) When the sample is not placed on the support, the indicating device is not reset and the normal operation is performed, the eleventh half cycle is oscillated. Absorbed energy or rising angle indicated by the test machine Distance of the lm pendulum axis to the center of the sample (the hit point) (pendulum length) L1 m distance from the axis of the pendulum axis to the strike center L2 m distance from the axis of the pendulum axis to the point of action of the force F MN·m moment, equal to the product of F×l2 nV - number of standard samples for indirect testing of test machines p J Absorption energy loss due to pointer friction P' J Absorbed energy loss due to pendulum bearing friction and air resistance Correction of energy loss when pβ J rise angle is β r J test machine measuring device resolution dial resolution RM - Standard sample (standard material) Table 1 (continued) Symbol/abbreviation a unit meaning sV J standard deviation of absorbed energy values obtained on nV standard samples SJ scale dial indexing error Ts pendulum swing period T s pendulum swings 100 times total time Maximum value of Tmax s T Minimum value of Tmin s T u(KVV) J KVV standard uncertainty u(BV) J test machine indication error (BV) introduced standard uncertainty u(F) J The measured standard uncertainty introduced by pendulum force (F) u(Fstd) J standard error of force sensor u(r) J standard uncertainty introduced by resolution uRM J Standard uncertainty of standard sample standard values for indirect inspection Standard uncertainty of uV J indirect test results α degree (°) angle of the pendulum β degree (°) angle of the pendulum νB - the degree of freedom corresponding to u(BV) νV - the degree of freedom corresponding to uV νRM - the degree of freedom corresponding to uRM a See Figure 4.5 testing machineThe test machine consists of the following parts (see Figures 1 to 3). a) foundation or installation device; b) the frame---supports the structure of the pendulum, excluding the foundation; c) pendulum, including the hammer; d) anvil and suppor......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 3808-2018_English be delivered?Answer: Upon your order, we will start to translate GB/T 3808-2018_English as soon as possible, and keep you informed of the progress. 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