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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 1927.20-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 20: Determination of cleavage strength Status: Valid
Basic dataStandard ID: GB/T 1927.20-2021 (GB/T1927.20-2021)Description (Translated English): Test methods for physical and mechanical properties of small clear wood specimens - Part 20: Determination of cleavage strength Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B68 Word Count Estimation: 7,765 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 1927.20-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 20: Determination of cleavage 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 20: Determination of cleavage strength ICS 79:040 CCSB68 National Standards of People's Republic of China Replacing GB/T 1942-2009 Test method for physical and mechanical properties of wood with small sample without defect Part 20: Determination of splitting resistance Published on 2021-12-31 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 20 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 1942-2009 "Test method for split resistance of wood": Compared with GB/T 1942-2009, except for structural adjustment and In addition to editorial changes, the main technical changes are as follows: a) terms and definitions are added (see Chapter 3); b) The requirements for measuring tools have been changed (see 5:1, 4:2 of the:2009 edition); c) Changed the requirements of the test machine (see 5:2, 4:1 of the:2009 edition), and added the test device diagram (see Figure 1); d) Changed the failure load accuracy requirements (see 7:2, 6:2 of the:2009 edition); e) The accuracy requirements of the calculation results have been changed (see Chapter 7 of 8:1,:2009 edition); f) Added requirements for processing test results (see 8:2); g) Changed Appendix A to be informative (see Appendix A, Appendix A of the:2009 edition): 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: Nanjing Forestry University, Anhui Agricultural University, International Bamboo and Rattan Center, State Forestry and Grassland Administration for wood-based panels and their products Quality Inspection and Testing Center (Nanjing), Xiamen Minghongtang Arts & Crafts Co:, Ltd:, Zhejiang Shiyou Wood Co:, Ltd:, Heilongjiang Academy of Forestry, Anhui University of Technology, Northeast Forestry University: The main drafters of this document: Zhang Yaoli, Wang Chuangui, Liang Xingyu, Jiang Zehui, Fei Benhua, Wang Xuan, Wang Youhong, Zhang Hua, Zhang Hao, Huang Can, Dou Qingqing, Liu Zhenbo, Kuai Bingbin, Ding Li: The previous versions of this document and its superseded documents are as follows: --- First published in 1980 as GB 1942-1980, first revised in:1991, second revised in:2009; --- This is the third revision, adjusted to Part 20 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 methods for wood physical and mechanical tests of small samples of wood without defects and "General Requirements" has been revised, ISO 3130:1975 "Determination of moisture content by physical and mechanical tests of wood", ISO 3131:1975 15 international standards for test methods such as "Determination of Density in Physical and Mechanical Tests of Wood" have been integrated and revised: Based on this, in order to comply with international standards 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 is carried out, and 22 scattered test methods are integrated: Adjusted to the sub-part document of GB/T 1927, and adopted the latest version of the international standard 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 determination: --- 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 rate of small sample wood without defect: --- 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 20: Determination of splitting resistance1 ScopeThis document describes the principles, equipment, specimens, test procedures, calculation of results, and recording of test results for the determination of the split resistance of small unblemished wood samples: and report: This document applies to the determination of the splitting resistance of small wood samples without defects: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 LY/T 1788 Terms for wood properties3 Terms and DefinitionsTerms and definitions defined in LY/T 1788 apply to this document:4 PrinciplesSimulate the force state of an axe splitting wood, apply a tensile force at one end of the sample perpendicular to the direction of the wood grain, so that the sample is split along the grain to measure the wood: The split resistance of the material:5 Equipment5:1 Vernier caliper, the division value is 0:02mm: 5:2 million energy testing machine, select the appropriate load range according to the characteristics of the material, and the measurement accuracy is 1% of the load value: For the test device see figure 1: ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 1927.20-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 1927.20-2021_English as soon as possible, and keep you informed of the progress. 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