GB/T 1927.12-2021 English PDFUS$249.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 1927.12-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 12: Determination of strength in compression perpendicular to grain Status: Valid
Basic dataStandard ID: GB/T 1927.12-2021 (GB/T1927.12-2021)Description (Translated English): Test methods for physical and mechanical properties of small clear wood specimens - Part 12: Determination of strength in compression perpendicular to grain Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B68 Word Count Estimation: 12,165 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 1927.12-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 12: Determination of strength in compression perpendicular to grain---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 12: Determination of strength in compression perpendicular to grain ICS 79:040 CCSB68 National Standards of People's Republic of China Replacing GB/T 1939-2009 Test method for physical and mechanical properties of wood with small sample without defect Part 12: Determination of compressive strength of transverse grains tograin (ISO 13061-5:2020, 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 12 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 1939-2009 "Wood cross-grain compression test method", compared with GB/T 1939-2009, except for structural adjustment In addition to editorial changes, the main technical changes are as follows: a) Changed the principle (see Chapter 4, Chapter 3 of the:2009 edition); b) Added the test equipment "Pressure plate" (see 5:3); c) Added requirements for wood moisture content and density measurement equipment (see 5:5); d) Added green wood samples (see 6:1:4); e) The method of determining the proportional ultimate load has been changed (see 6:3:1, 5:2:4 of the:2009 edition); f) Added Figure 2, Figure 3 and Figure 4; g) Added the content of air-dry density measurement (see 6:2:2 and 7:2:2); h) Appendix A is changed to informative: This document is modified to adopt ISO 13061-5:2020 "Test methods for the physical and mechanical properties of wood with small defect-free specimens - Part 5: Cross-grain resistance Determination of Compressive Strength: Compared with ISO 13061-5:2020, this document has the following structural adjustments: a) 6:1 corresponds to Chapter 6 of ISO 13061-5:2020; b) 6:2 corresponds to Chapter 7 of ISO 13061-5:2020; c) 6:3 corresponds to Chapter 8 of ISO 13061-5:2020; d) Chapter 8 corresponds to Chapter 9 of ISO 13061-5:2020: The technical differences between this document and ISO 13061-5:2020 and their reasons are as follows: a) changed the source of terminology (see Chapter 3) to ensure professionalism and uniformity of terminology; b) Added the local compressive test of wood transverse grain (see Chapter 7), because this test method has been used in the historical versions of Chinese standards, and it has been applied value; c) Changed the principle (see Chapter 4), the national standard does not consider "the direction of the growth wheel is at an angle of 45°" to apply the load, because this direction less test applications; d) Figure 1, Figure 2 and Figure 4 are added to help understand the test equipment, samples and test operation steps; e) Added the test equipment "Pressure plate" (see 5:3), because the pressure plate is an accessory that must be used in the test; f) Changed the sample size requirements (see 6:1), because the specific sample size is specified to facilitate the test; g) The specific requirements for sample preparation for the determination of the moisture content of the sample are added (see 6:2:7), because it is beneficial to the implementation of the moisture content test; h) The method for determining the proportional limit load is added, that is, the point on the load-deformation diagram that deviates from the straight line is taken as the proportional limit load load (see 6:3:1), because this method is a traditional method for determining the proportional limit load and has application value; i) Changed the test loading speed range (see 6:2:4), the loading speed still meets the requirements of ISO 13061-5:2020, because it is related to the Historical versions remain consistent: The following editorial changes have been made to this document: a) 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 12: Horizontal Determination of grain compressive strength"; b) Added Appendix A (informative) "Record Table of Compression Test of Wood Horizontal Grain (Partial)": 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 was drafted by: International Bamboo and Rattan Center, Wood Industry Research Institute of China Academy of Forestry, Xiamen Minghongtang Arts & Crafts Co:, Ltd: Company, Dehua Bunny Decoration New Materials Co:, Ltd:, Suzhou Kunlun Lvjian Wood Structure Technology Co:, Ltd:, Zhejiang Shiyou Wood Industry Co:, Ltd: Company, Anhui Agricultural University, Northeast Forestry University, Suzhou David Wood Industry Co:, Ltd:, Shougang Environmental Industry Co:, Ltd:, China Forestry Society: The main drafters of this document: Jiang Zehui, Yu Huaqiang, Wang Chaohui, Wang Youhong, Xu Bin, Zhao Youke, Zhang Ran, An Xin, Liu Jing, Zhang Xunya, Wang Xiaoxia, Liu Yixing, Guo Minghui, Ye Diaoyou, Ni Jun, Huang Can, Ni Yueping, Yu Lichun: The previous versions of this document and its superseded documents are as follows: --- First published in 1980 as GB 1939-1980, first revised in:1991, second revised in:2009; --- This is the third revision, adjusted to Part 12 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, the International Organization for Standardization (ISO ) on ISO 3129:2012 "Sampling methods and "General Requirements" has been revised, and ISO 3130:1975 "Determination of moisture content by physical and mechanical tests of wood", ISO 3131:1975 "Wood physical and mechanical tests" 15 international standards for test methods such as "Determination of Density in Mechanical Tests" have been integrated and revised: Based on this, in order to be in line with international standards, this time The third revision of the national standard for test methods for physical and mechanical properties of wood, the integration of 22 scattered test methods into GB/T 1927 Part of the document, in revision to adopt the latest edition of the International Standard: 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 12: Determination of compressive strength of transverse grains1 ScopeThis document describes the determination of the transverse grain compressive proportional ultimate strength of wood, including the transverse grain full compressive proportional ultimate strength and the transverse grain local compressive strength: Principles of proportional ultimate strength, test equipment, samples, test procedures, result calculation and test records, etc: This document applies to the determination of the transverse grain compressive proportional ultimate strength of small unblemished wood samples: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) Note: There is no technical difference between the quoted content of GB/T 1927:2-2021 and the quoted content of ISO 3129:2012: GB/T 1927:4-2021 Test methods for physical and mechanical properties of wood with small samples without defects - Part 4: Determination of moisture content (ISO 13061-1:2014, MOD) Note: There is no technical difference between the quoted content of GB/T 1927:4-2021 and the quoted content of ISO 13061-1:2014: GB/T 1927:5-2021 Test methods for the physical and mechanical properties of wood with small unblemished samples - Part 5: Determination of density (ISO 13061-2: 2014, MOD) Note: There is no technical difference between the quoted content of GB/T 1927:5-2021 and the quoted content of ISO 13061-2:2014: LY/T 1788 Terms for wood properties3 Terms and DefinitionsTerms and definitions defined in LY/T 1788 apply to this document:4 PrinciplesLoad the entire surface or part of the surface of the specimen in the radial or chord direction, respectively, and determine the ratio from the load-deformation curve of the cross-grain compressive test: Example of ultimate load, calculate the ultimate strength of timber transverse compressive proportion:5 Test equipment5:1 Testing machine The accuracy of the measured load shall meet the requirements of 5:5 in GB/T 1927:2-2021, and shall have spherical sliding bearings: 5:2 Deformation measuring device Measure the deformation of the sample under loading 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