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GB/T 1940-2009 English PDF

US$279.00 · In stock
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GB/T 1940-2009: Method of testing in toughness of wood
Status: Obsolete

GB/T 1940: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 1940-2009English279 Add to Cart 3 days [Need to translate] Method of testing in toughness of wood Obsolete GB/T 1940-2009
GB/T 1940-1991English199 Add to Cart 2 days [Need to translate] Method of testing in toughness of wood Obsolete GB/T 1940-1991

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Basic data

Standard ID GB/T 1940-2009 (GB/T1940-2009)
Description (Translated English) Method of testing in toughness of wood
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard B60
Classification of International Standard 79.020
Word Count Estimation 6,644
Date of Issue 2009-02-23
Date of Implementation 2009-08-01
Older Standard (superseded by this standard) GB/T 1940-1991
Quoted Standard GB/T 1928-2009; GB/T 1929-2009; GB/T 1931-2009
Regulation (derived from) National Standard Approval Announcement 2009 No.3 (Total No.143)
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the determination of wood toughness test equipment, test procedure, , specimens and test results are recorded the results of the calculation and reporting. This standard applies to the use of pendulum impact testing machine measuring timber unblemished small sample of impact toughness.

GB/T 1940-2009: Method of testing in toughness 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.
Method of testing in toughness of wood ICS 79.020 B60 National Standards of People's Republic of China Replacing GB/T 1940-1991 Impact toughness test method for wood (ISO 3348. 1975, Wood- Determinationofimpactbendingstrength, MOD) Posted 2009-02-23 2009-08-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This revised standard adopts the International Standard ISO 3348. 1975 "Wood impact bending strength determination." This standard and ISO 3348. 1975 compared to the main technical content differences are as follows. --- 4.2 Modify measurement tools vernier caliper or other measuring tools (1975 edition and 4.2); 7.2 --- modified, impact toughness test of the water content was 12%, (2) A12 = AW shall formula [1 + 0.02 (W-12)] calculated (1975 edition and 7.2). This standard replaces GB/T 1940-1991 "Test Method for Wood impact toughness." This standard compared with GB/T 1940-1991, the main changes are as follows. --- Chapter 2 increase in GB/T 1931-2009 "Method for determination of moisture content of wood" (1991 edition and Chapter 2). --- 4.2 Modify measurement tools vernier caliper or other measuring tools (1991 edition and 4.2). --- Add "4.3 Wood moisture content determination equipment shall comply with GB/T 1931-2009 the provisions of Chapter 3," (1991 and Excerpts 4.3). --- 6.1 modify, only tangential impact toughness test. In the center of the length of the sample were measured height, width (tangential or radial ulnar Inch), accurate to 0.1mm. If necessary, increase the radial load test (1991 edition and 6.1). --- Remove 6.2 "will fill the energy absorbed by the specimen in Appendix A (Supplement) records in the table" (1991 edition and 6.2). --- Add "6.3 test specimen, immediately at the near destruction of the sample, the interception of a block about 20mm long, with reference to GB/T GB/T 1931-2009 Method for determination of moisture content of wood (ISO 3130. 1975, Wood-Determinationofmoisture contentforphysicalandmechanicaltests, MOD) Principle 3 The impact load is applied to the center of the sample, the sample bending damage, to determine the impact toughness of wood.

4 Test Equipment

4.1 Charpy impact test machine, accuracy, should be consistent with GB/T 1928-2009 Chapter 6 requirements. Specimen bearing and pendulum punch ends Curvature radius of 15mm, the distance between the two seats is 240mm, seat height should be greater than 20mm. 4.2 Measurement tools vernier caliper or other measuring tools, measurements should be accurate to 0.1mm. 4.3 Wood moisture content determination equipment shall comply with GB/T 1931-2009 the provisions of Chapter 3.

5 Sample

5.1 test material sawing and test specimens shall comply with GB/T 1929-2009 the provisions of Chapter 3. 5.2 Sample size is 300mm × 20mm × 20mm, a length along the grain direction; adjust the sample preparation requirements and inspection, the sample moisture content Whole, should conform to GB/T 1928-2009 Chapter 3 and Chapter 4 requirements.

6 Test procedure

6.1 only tangential impact toughness test. In the center of the length of the sample were measured height, width (tangential or radial dimension), to the nearest 0.1mm. If desired, the test can be increased radially. 6.2 symmetrically placed on the sample holder tester, pendulum impact testing machine so that the surface of the sample length to diameter of the center should be a thrust, a sample Accurate to absorb energy 1J. 6.3 test specimen, immediately at the near destruction of the sample, the interception of a block about 20mm long, with reference to GB/T 1931 measurement sample containing Water rates.

7 Results Calculation

The aqueous sample was 7.1 W when the impact toughness, shall be calculated by formula (1), to the nearest 1kJ/m2.

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