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GB/T 1938-2009 English PDF

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GB/T 1938-2009: Method of testing in tensile strength parallel to grain of wood
Status: Obsolete

GB/T 1938: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 1938-2009English279 Add to Cart 3 days [Need to translate] Method of testing in tensile strength parallel to grain of wood Obsolete GB/T 1938-2009
GB/T 1938-1991English199 Add to Cart 2 days [Need to translate] Method of testing in tensile stength parallel to grain of wood Obsolete GB/T 1938-1991

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Basic data

Standard ID GB/T 1938-2009 (GB/T1938-2009)
Description (Translated English) Method of testing in tensile strength parallel to grain of wood
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard B60
Classification of International Standard 79.020
Word Count Estimation 6,630
Date of Issue 2009-02-23
Date of Implementation 2009-08-01
Older Standard (superseded by this standard) GB/T 1938-1991
Quoted Standard GB/T 1928-2009; GB/T 1929-2009; GB/T 1931-2009
Adopted Standard ISO 3345-1975, MOD
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 the tensile strength of the wood along the grain test equipment, test procedure, , specimens and test results are recorded the results of the calculation and reporting. This standard applies to a small sample of the wood along the grain unblemished tensile tests.

GB/T 1938-2009: Method of testing in tensile strength parallel to grain 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 tensile strength parallel to grain of wood ICS 79.020 B60 National Standards of People's Republic of China Replacing GB/T 1938-1991 Grain of wood tensile strength testing (ISO 3345. 1975, Wood-Determinationofultimatetensilestress paraleltograin, 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 3345. 1975 "grain of wood - Determination of ultimate tensile stress." This standard and ISO 3345. 1975 compared to the main technical differences are as follows. --- 4.1 modify the crosshead of the testing machine, chuck or any other fixture stroke of not less than 400mm (1975 edition Nian and 4.1); --- 4.2 Modify measurement tools vernier caliper or other measuring tools (1975 edition and 4.2); --- Modification 7.2 The tensile strength parallel to grain moisture content of 12%, shall be the formula (2) σ12 = σW [1 + 0.015 (W-12)] Calculation (1975 edition and 7.2). This standard replaces GB/T 1938-1991 "Test Method for Tensile Strength grain of wood." This standard compared with GB/T 1938-1991, the main technical changes as follows. --- 4.1 modify the crosshead of the testing machine, chuck or any other fixture stroke of not less than 400mm (1991 edition Nian and 4.1); --- 4.2 Modify measurement tools vernier caliper or other measuring tools (1991 edition and 4.2); --- 4.3 modify, wood moisture content determination equipment shall comply with GB/T 1931-2009 the provisions of Chapter 3 (1991 and Excerpts 4.3); --- Remove 6.3 "will fill the failure load into Appendix A (Supplement) records in the table" (1991 edition and 6.3); --- Edit "8 test results recording and reporting", test results are reported in accordance with Appendix A fill; the test report according to GB/T 1928-2009 7.4 Content guidelines for preparation (1991 edition and 8); Tension, prevent longitudinal twisting. 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 and shape, as shown in Figure 1. 5.3 sample preparation requirements and inspection, adjust the moisture content of the sample, shall conform to GB/T 1928-2009 Chapter 3 and Chapter 4 requirements. 5.4 Sample texture should be straight, tangential direction of the growth ring should be perpendicular to the active portion of the sample (refer to the middle section of 60mm) wide face. Sample Transition arc surface of the effective portion and the clamping portion between the two ends should be smooth and symmetrical with the center line of the sample. 5.5 soft wood samples should be narrow face holding portion, attached to 90mm × 14mm × 8mm hardwood clip pads, adhesive fixed Specimen. Hard wood sample may wood clip without cushion.

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