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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 1927.9-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 9: Determination of bending strength Status: Valid
Basic dataStandard ID: GB/T 1927.9-2021 (GB/T1927.9-2021)Description (Translated English): Test methods for physical and mechanical properties of small clear wood specimens - Part 9: Determination of bending strength Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B68 Word Count Estimation: 8,847 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 1927.9-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 9: Determination of bending strength---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. Test methods for physical and mechanical properties of small clear wood specimens -- Part 9: Determination of bending strength ICS 79:040 CCSB68 National Standards of People's Republic of China Replacing GB/T 1936:1-2009 Test method for physical and mechanical properties of wood with small sample without defect Part 9: Determination of flexural strength (ISO 13061-3:2014, Physical and mechanical properties of wood- 2021-12-31 Released 2022-07-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration forewordThis document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted: This document is part 9 of GB/T 1927 "Test Methods for Physical and Mechanical Properties of Small Specimens of Wood without Defects": GB/T 1927 has been issued The following parts are distributed: --- Part 1: Collection of test materials; --- Part 2: Sampling methods and general requirements; --- Part 3: Determination of growth ring width and latewood rate; --- Part 4: Determination of moisture content; --- Part 5: Density determination; --- Part 6: Determination of dry shrinkage; --- Part 7: Determination of water absorption; --- Part 8: Determination of swelling properties; --- Part 9: Determination of flexural strength; --- Part 10: Determination of flexural modulus of elasticity; --- Part 12: Determination of transverse grain compressive strength; --- Part 17: Determination of impact toughness; --- Part 18: Determination of impact indentation; --- Part 19: Determination of hardness; --- Part 20: Determination of splitting resistance: This document replaces GB/T 1936:1-2009 "Test method for flexural strength of wood": Compared with GB/T 1936:1-2009, except for structural adjustment In addition to the adjustment and editorial changes, the main technical changes are as follows: a) terms and definitions are added (see Chapter 3); b) The schematic diagram of the bending strength test including the test equipment and sample requirements has been added (see Figure 1); c) Added requirements for moisture content of samples (see 6:2); d) Modified the moisture content range for the flexural strength conversion of air-dried wood samples (see 8:2, 7:2 of the:2009 edition); e) The calculation accuracy requirements for the mean and standard deviation of the flexural strength have been added (see 8:3); f) Added the test result record requirements (see 9:1), and changed the test report content requirements (see 9:2, Chapter 8 of the:2009 edition): This document is modified to adopt ISO 13061-3:2014 "Test methods for the physical and mechanical properties of wood with small specimens without defects - Part 3: Static bending Determination of ultimate bending strength: This document has the following structural adjustments compared to ISO 13061-3:2014: ---5:2 corresponds to 5:2 and 5:3 in ISO 13061-3:2014, 5:3 corresponds to 5:4 and 5:4 in ISO 13061-3:2014 5:5 in ISO 13061-3:2014; --- Added 9:1, 9:2 corresponding to Chapter 9 in ISO 13061-3:2014: The technical differences between this document and ISO 13061-3:2014 and their reasons are as follows: --- Regarding normative reference documents, this document has made adjustments with technical differences to adapt to the technical conditions of our country and the circumstances of the adjustment: The situation is reflected in Chapter 2 "Normative References", and the specific adjustments are as follows: ● Replace ISO 3129 with GB/T 1927:2-2021 which is modified to adopt international standard; ● Replace ISO 13061-1 with GB/T 1927:4 which is modified to adopt international standard; ● Replaced ISO 24294 with LY/T 1788: --- Changed the requirements for testing machines, testing devices, indenters, and measuring instruments in International Standards 5:1~5:4; --- Changed the sample size requirements in International Standard 6:1:2; --- Changed the adjustment requirements for moisture content of air-dried wood samples in International Standard 6:2:3; --- Changed the test procedure in Chapter 7 of the International Standard; --- Changed the accuracy requirements for the calculation results of flexural strength in International Standard 8:1; --- Changed the calculation requirements for flexural strength when the moisture content is 12% in International Standard 8:2; --- Changed the accuracy requirements for the calculation results of the mean value and standard deviation of the flexural strength in International Standard 8:3; --- Added 9:1 test result record; --- Delete the content of the method and coefficient used to adjust the sample density and results to 12% moisture content in the test report in Chapter 9 of the International Standard Require: The following editorial changes have been made to this document: --- In order to harmonize with the existing standards, the name of the standard is changed to "Test methods for physical and mechanical properties of wood with small samples without defects - Part 9: Resistance to Bending Strength Measurement"; --- Added Appendix A (Informative) Timber Flexural Strength Determination Record Table: Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by the State Forestry and Grassland Administration: This document is under the jurisdiction of the National Timber Standardization Technical Committee (SAC/TC41): This document is drafted by: Timber Industry Research Institute, Chinese Academy of Forestry, China Southwest Architecture Design and Research Institute Co:, Ltd:, Hal Binzhou University of Technology, Dehua Bunny Decoration New Materials Co:, Ltd:, Xiamen Minghongtang Arts & Crafts Co:, Ltd:, Jiusheng Flooring Co:, Ltd:, Forbidden City Museum, North China University of Technology, Central South University of Forestry and Technology: The main drafters of this document: Zhong Yong, Ren Haiqing, Wu Guofang, Ogaga, Niu Shuang, Xu Enguang, Zhu Zhaoyang, Li Xiazhen, Zhao Rongjun, Wang Chaohui, Wang Yurong, Gong Yingchun, Yin Yafang, Zhou Haibin, Jiang Jinghui, Zhang Ran, Wang Xueyu, Luo Xiangya, Sun Jingcheng, Xie Xuqin, Huang Can, Ye Jiahao: The previous versions of this document and its superseded documents are as follows: ---First published in 1980 as GB 1936-1980; --- When it was first revised in:1991, it was adjusted to Part 1 of GB 1936; ---Second revision in:2009; --- This is the third revision, adjusted to Part 9 of GB/T 1927:IntroductionThe standard of test methods for physical and mechanical properties of wood is used in wood scientific research, teaching, wood inspection, wood structure design, wood processing and production, etc: It is widely used and is an important basic standard in the wood industry: In 1980, my country issued the first edition of the test methods for physical and mechanical properties of wood: The domestic standard (GB/T 1927~GB/T 1943) was revised twice in:1991 and:2009 respectively: In recent years, with the development of wood science and technology The development of technology, ISO 3129:2012 "Sampling method for wood physical and mechanical testing of small samples of wood without defects" Law and General Requirements" was revised to ISO 3130:1975 "Determination of moisture content by physical and mechanical tests of wood", ISO 3131: In 1975, 15 international standards for test methods such as "Determination of Density in Physical and Mechanical Tests of Wood" were integrated and revised: Based on this, for the In line with the standard, this time, the third revision of the national standard for test methods for physical and mechanical properties of wood in my country will be carried out, and 22 test methods will be scattered: The integration is adjusted to the sub-part document of GB/T 1927, and the latest version of the international standard is adopted in the revision: GB/T 1927 aims to establish a test method for the physical and mechanical properties of small sample wood without flaws, and is intended to be composed of 21 parts: --- Part 1: Collection of test materials: The purpose is to describe the sample collection method for testing the physical and mechanical properties of wood with small samples without defects: --- Part 2: Sampling methods and general requirements: The purpose is to establish a suitable test for the physical and mechanical properties of small wood samples without defects: Specimen sawing, interception methods and general requirements to be observed when testing methods: --- Part 3: Determination of growth ring width and latewood rate: The purpose is to characterize the growth ring width and latewood rate of small samples of clear wood method of measurement: --- Part 4: Determination of moisture content: The purpose is to describe a method for the determination of the moisture content of small wood samples without defects: --- Part 5: Density determination: The purpose is to describe the density, air-dry density, absolute dry Methods for the determination of density and basic density: --- Part 6: Determination of dry shrinkage: The purpose is to describe the measurement of radial, chordwise and volume drying shrinkage of unblemished small sample wood: determined method: --- Part 7: Determination of water absorption: The purpose is to describe the determination method of 6h, 24h and the maximum water absorption of small sample wood without defects: --- Part 8: Determination of swelling: The purpose is to describe the measurement of radial, chordwise and volumetric swell of unblemished small wood samples: determined method: --- Part 9: Determination of flexural strength: The purpose is to describe a method for the determination of the flexural strength of small wood samples without defects: --- Part 10: Determination of flexural modulus of elasticity: The purpose is to describe a method for the determination of the flexural modulus of elasticity of small wood samples without defects: --- Part 11: Determination of compressive strength along grain: The purpose is to describe a method for the determination of the compressive strength along the grain of small wood samples without defects: --- Part 12: Determination of transverse grain compressive strength: The purpose is to describe the transverse grain compressive proportional ultimate strength of small unblemished wood samples, including Methods for the determination of the total compressive proportional ultimate strength of the horizontal grain and the partial compressive proportional ultimate strength of the horizontal grain: --- Part 13: Determination of compressive elastic modulus of transverse grains: The purpose is to describe the measurement of the transverse-grain compressive elastic modulus of unblemished small samples of wood: determined method: --- Part 14: Determination of tensile strength along grain: The purpose is to describe a method for the determination of the along-grain tensile strength of unblemished small samples of wood: --- Part 15: Determination of transverse grain tensile strength: The purpose is to describe a method for the determination of the transverse grain tensile strength of small wood samples without defects: --- Part 16: Determination of shear strength along grain: The purpose is to describe a method for the determination of the shear strength along the grain of small wood samples without defects: --- Part 17: Determination of impact toughness: The purpose is to describe a method for the determination of the chordwise impact toughness of small unblemished wood samples: --- Part 18: Determination of impact indentation: The purpose is to describe a method for the determination of the impact indentation resistance of unblemished small samples of wood: --- Part 19: Determination of hardness: The purpose is to describe a method for the determination of radial, chord, and longitudinal hardness of small, unblemished wood samples: --- Part 20: Determination of splitting resistance: The purpose is to describe the method for the determination of the splitting resistance on the radial and chord surfaces of small wood samples without defects: --- Part 21: Determination of nail holding force: The purpose is to describe a method for the determination of the nail-holding force of small samples of wood without defects: Test method for physical and mechanical properties of wood with small sample without defect Part 9: Determination of flexural strength1 ScopeThis document describes the principles, test equipment, test specimens, test procedures, calculation of results, and tests for the determination of the flexural strength of wood in small unblemished specimens: Results recording and reporting: This document applies to the determination of the flexural strength of unblemished small specimens of wood:2 Normative referencesThe contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document: GB/T 1927:2-2021 Test methods for physical and mechanical properties of wood with small unblemished samples - Part 2: Sampling methods and general requirements (ISO 3129:2019, MOD) GB/T 1927:4 Test methods for physical and mechanical properties of wood with small flawless specimens - Part 4: Determination of moisture content (GB/T 1927:4- 2021, ISO 13061-1:2014, MOD) LY/T 1788 Terms for wood properties3 Terms and DefinitionsTerms and definitions defined in LY/T 1788 apply to this document:4 PrinciplesThe specimen is loaded at a uniform speed to failure at the center of the test span, and the flexural strength of the wood is obtained from the maximum load in the test:5 Test equipment5:1 For the testing machine, the measured load should be accurate to 1%: 5:2 In the test device, the radius of curvature of the end of the support and the indenter should be 30mm, and the test span should be 240mm, as shown in Figure 1: 5:3 Vernier calipers or other dimension measuring tools should be accurate to 0:1mm: 5:4 The wood moisture content measurement equipment shall comply with the provisions of GB/T 1927:4:6 samples6:1 General requirements 6:1:1 The sample preparation shall comply with the provisions of GB/T 1927:2-2021: ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 1927.9-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 1927.9-2021_English as soon as possible, and keep you informed of the progress. 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