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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 1927.3-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 3: Determination of the growth rings width and latewood rate of wood Status: Valid
Basic dataStandard ID: GB/T 1927.3-2021 (GB/T1927.3-2021)Description (Translated English): Test methods for physical and mechanical properties of small clear wood specimens - Part 3: Determination of the growth rings width and latewood rate of wood Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: B68 Word Count Estimation: 6,681 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 1927.3-2021: Test methods for physical and mechanical properties of small clear wood specimens - Part 3: Determination of the growth rings width and latewood rate of wood---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 3: Determination of the growth rings width and latewood rate of wood ICS 79:040 CCSB68 National Standards of People's Republic of China Replacing GB/T 1930-2009 Test method for physical and mechanical properties of wood with small sample without defect Part 3: Growth Ring Width and Latewood Rate Determination 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 3 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 1930-2009 "Determination Method of Timber Annual Ring Width and Latewood Rate", compared with GB/T 1930-2009, except In addition to structural adjustments and editorial changes, the main technical changes are as follows: a) Changed "Annual Rings" to "Growth Rings" throughout the text; b) Added the terms and definitions of growth rings, growth ring width, latewood and latewood rate (see Chapter 3): 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, Suzhou Kunlun Lvjian Wood Structure Technology Co:, Ltd:, Zhejiang Shiyou Wood Industry Co:, Ltd:, Hongmu Fang Home Furnishing Technology (Huzhou) Co:, Ltd:, Beijing Forestry University, Guangdong Forestry Research Institute, Guizhou Minzu University, Qilu University of Technology, Northwest Agriculture and Forestry University, Nanjing Forestry University Science, Sichuan Forestry Research Institute: The main drafters of this document: Fei Benhua, An Xin, Huang Anmin, Yu Huaqiang, Zhao Rongjun, Zhao Youke, Li Xiaoling, Huang Rongfeng, Jin Zhi, Zhang Ran, Xu Jinmei, Xiang Eling, Huang Can, Ni Jun, Ni Yuezhong, Zhang Chao, Zhang Shuqin, Liu Rong, Chen Meiling, Chen Qi, Song Shasha, Xie Guijun, Li Wanju, Chen Lisheng, Tang Tong, Mi Bingbing, Lian Caiping, Luo Junji, Huang Zhonghua, Gao Yanling, Yang Na, Zhen Wei: The previous versions of this document and its superseded documents are as follows: --- First published in 1980 as GB 1930-1980, first revised in:1991, second revised in:2009; --- This is the third revision, adjusted to Part 3 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 "Wood 15 international standards for test methods such as "Determination of Density in Physical and Mechanical Tests" have been integrated and revised: Based on this, in order to be in line with international standards, this time The third revision was made to the national standard for test methods for physical and mechanical properties of wood in my country, and the 22 scattered test methods were integrated and adjusted to The sub-part document of GB/T 1927 adopts 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 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 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 3: Growth Ring Width and Latewood Rate Determination1 ScopeThis document describes the test equipment, test specimens, test procedures, calculation results and test records, etc: This document is applicable to the width of the growth ring with a clear growth ring boundary on the cross section of the wood sample without defects and the wood growth ring with a clear difference between the early and late wood: Determination of latewood percentage in long rounds: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 1788-2008 Terms of wood properties3 Terms and DefinitionsThe terms and definitions defined in LY/T 1788-2008 and the following terms and definitions apply to this document: 3:1 growth ring Tree cambium The concentric rings surrounding the pith as seen in cross-section of the tree trunk, formed during each growth cycle: Note: Some tropical trees grow year-round and thus do not have distinct growth rings, but may have growth rings: In temperate regions, the growth rings of trees are called annual rings: [Source: LY/T 1788-2008, 3:2:11] 3:2 growthringwidth The vertical distance between two adjacent wheel boundaries: 3:3 latewood Wood formed near the bark direction of a tree late in the growing season within a growth ring: [Source: LY/T 1788-2008, 3:2:15, with modifications] 3:4 latewood ratio The percentage of the width of the latewood on the cross-section of the wood to the width of the growth ring in which it is located: [Source: LY/T 1788-2008, 3:2:16, with modifications]4 PrinciplesMeasure the width, number and total latewood width of all whole growth rings of the sample, and determine the average width of growth rings and latewood ratio: ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 1927.3-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 1927.3-2021_English as soon 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