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GB/T 1927.13-2022: Test methods for physical and mechanical properties of small clear wood specimens - Part 13: Determination of the modulus of elasticity in compression perpendicular to grain
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Test methods for physical and mechanical properties of small clear wood specimens - Part 13: Determination of the modulus of elasticity in compression perpendicular to grain
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GB/T 1927.13-2022
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Basic data | Standard ID | GB/T 1927.13-2022 (GB/T1927.13-2022) | | Description (Translated English) | Test methods for physical and mechanical properties of small clear wood specimens - Part 13: Determination of the modulus of elasticity in compression perpendicular to grain | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B68 | | Word Count Estimation | 9,984 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 1927.13-2022: Test methods for physical and mechanical properties of small clear wood specimens - Part 13: Determination of the modulus of elasticity in compression perpendicular to grain
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Test methods for physical and mechanical properties of small clear wood specimens - Part 13.Determination of the modulus of elasticity in compression perpendicular to grain
ICS 79.040
CCSB68
National Standards of People's Republic of China
Replacing GB/T 1943-2009
Test method for physical and mechanical properties of wood with small sample without defect
Part 13.Determination of compressive elastic modulus of transverse grains
Published on 2022-07-11
2023-02-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
foreword
This 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 13 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 11.Determination of compressive strength along grain;
--- Part 12.Determination of transverse grain compressive strength;
--- Part 13.Determination of compressive elastic modulus of transverse grains;
--- Part 14.Determination of tensile strength along grain;
--- Part 15.Determination of transverse grain tensile strength;
--- Part 16.Determination of shear strength along grain;
--- Part 17.Determination of impact toughness;
--- Part 18.Determination of impact indentation;
--- Part 19.Determination of hardness;
--- Part 20.Determination of splitting resistance;
--- Part 21.Determination of nail holding force.
This document replaces GB/T 1943-2009 "Determination of compressive elastic modulus of wood transverse grain", compared with GB/T 1943-2009, except
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
--- Added "Terms and Definitions" (see Chapter 3);
--- Changed the provisions for measuring the gauge length of deformation (see 5.2, 4.2 of the.2009 edition);
--- Changed the provisions of the sample size (see 6.2, 5.2 of the.2009 edition);
--- Added wood in green state or air-dried state (see 6.5);
--- Increase the provisions for the measurement of sample density (see 7.1);
--- Changed the provisions for measuring the position of the deformation gauge length of the sample, from 20mm from both ends to more than 10mm (see 7.2,.2009
version 6.2);
--- Changed the provisions on loading and unloading, and changed it to six times of loading and unloading, and took the average value of the deformation measured in the last three tests as the calculation
Deformation mean (see 7.4 and 7.5, 6.3 and 6.4 of the.2009 edition);
--- Changed the water content adjustment range and expression method (see 8.2, 7.2 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. Timber Industry Research Institute, Chinese Academy of Forestry, International Bamboo and Rattan Center, Suzhou Kunlun Green Building Wood Structure Technology
Co., Ltd., Dehua Bunny Decoration New Materials Co., Ltd., Xiamen Minghongtang Arts & Crafts Co., Ltd., Zhejiang Shiyou Wood Industry Co., Ltd.
Company, Sichuan Forestry Research Institute, China Architecture Southwest Design and Research Institute Co., Ltd., Beijing University of Civil Engineering and Architecture.
The main drafters of this document. Wang Chaohui, Fei Benhua, Yu Huaqiang, Ren Haiqing, Huang Zhonghua, Wang Xiaoxia, Xing Xinting, Ou Jiajia, Zhang Guowei,
Lu Yangbo, Tian Zhaopeng, Jiang Jinghui, An Xin, Gong Yingchun, Ni Jun, Shen Jianping, Huang Can, Ni Yueping, Zhang Dezhi.
The previous versions of this document and its superseded documents are as follows.
--- First published in 1980 as GB 1943-1980, first revised in.1991, second revised in.2009;
--- This is the third revision, adjusted to Part 13 of GB/T 1927.
Introduction
The 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 method standards 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 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 13.Determination of compressive elastic modulus of transverse grains
1 Scope
This document describes the test principle, equipment, specimens, test procedures, result calculation and test report for determining the transverse grain compressive elastic modulus of wood.
Announcement and so on.
This document is applicable to the determination of the compressive elastic modulus of all transverse grains of wood in the green state or in the air-dried state without any defects.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations
For documents, only the dated version 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 the physical and mechanical properties of wood with small unblemished samples - Part 2.Sampling methods and general rules
GB/T 1927.4 Test methods for physical and mechanical properties of wood with small samples without flaws - Part 4.Determination of moisture content
GB/T 1927.5 Test methods for the physical and mechanical properties of wood with small samples without defects - Part 5.Density determination
LY/T 1788 Terms for wood properties
3 Terms and Definitions
Terms and definitions defined in LY/T 1788 apply to this document.
4 Principles
When the transverse grain of wood is compressed, the compressive elastic modulus of the transverse grain of wood is determined by the ratio of stress to strain within the proportional limit stress.
5 Test equipment
5.1 The testing machine should be calibrated regularly in accordance with the standard procedures of the national metrology department. The error of the displayed value of the testing machine should not exceed ±1%, and it should have at least
A spherical sliding platen (or support).
5.2 The gauge length of the strain gauge for measuring the strain of the specimen shall not be less than 5mm, and the dispersion of the sensitivity coefficient shall be less than ±1%, or other gauge length deformation indications shall be
For devices with an error within ±1%.
5.3 Test measuring tool, the measurement size should be accurate to 0.1mm.
5.4 The test equipment specified in GB/T 1927.4 shall be used for the determination of moisture content.
6 samples
6.1 The sawing of the test material and the interception of the sample shall be carried out according to the provisions of GB/T 1927.2.
6.2 The sample is a cuboid, each side is square or rectangle, and the size of the sample is shown in Figure 1.Height (h) × width (b) × thickness (t), where the height
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