GB/T 15777-2017 in English

VALID

Method for determination of the modulus of elasticity in compression parallel to grain of wood

Issued on:2017-11-01
Implemented on:2018-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $110.00
$107.00

Standard No:	GB/T 15777-2017
Document status:	VALID
Title in English:	Method for determination of the modulus of elasticity in compression parallel to grain of wood
Title in Chinese:	木材顺纹抗压弹性模量测定方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2017-11-01
Implemented on:	2018-05-01
Superseding:	GB/T 15777-1995 Method for determination of the modulus of elasticity in compressive parallel to grain of wood
ICS Classification:	79.020-Wood technology processes
Professional Classification:	GB-National Standard
Related Keywords:	systematic determination method new test method data recording new method content determination wood introduction gb/t
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《GB/T 15777-2017木材顺纹抗压弹性模量测定方法》由TC41（全国木材标准化技术委员会）归口，TC41SC1（全国木材标准化技术委员会基础标准分会）执行，主管部门为国家林业和草原局。

Introduction

GB/T 15777—2017 Standard Overview

Standard Version	Release Year	Main Updates	Scope of Application
GB/T 15777—2017	2017	- Added the accuracy requirements for the load and deformation measurement device of the testing machine- Added a method for measuring deformation by pasting strain gauges- Expanded the deformation gauge range- Specified loading rate and moisture content adjustment formula correction	Applicable to the determination of the compressive elastic modulus along the grain of small defect-free wood specimens
GB/T 15777—1995	1995	- Initial release	Same as above

Background of standard update and analysis of technological evolution

With the development of the wood industry, higher requirements are placed on the accuracy and efficiency of material performance testing. The original standard GB/T 15777-1995 exposed the following problems during use:

The accuracy requirements of the measuring equipment are not clear enough
The impact of the loading rate on the test results is not specified
Lack of a systematic determination method for the moisture content of the specimen and the width of the annual ring

In response to these problems, the 2017 version of the standard was comprehensively revised, and the main improvements include:

Increase the load accuracy requirement of the testing machine to ±1%
Add a new method for measuring deformation by sticking strain gauges
Expand the deformation gauge range to 10mm~40mm
Specify the loading rate to 0.50mm/min, and allow a fluctuation of ±25%

Standard implementation suggestions and precautions

To ensure the effective implementation of the standard, it is recommended to take the following measures:

Equipment calibration: Regularly perform metrological verification on the testing machine and measuring device
Staff training: Strengthen the understanding and operation specifications of the new test method
Data recording: Strictly record the experimental results in the table format provided in Appendix A

Notes:

During the loading process, the speed is strictly controlled to be 0.50mm/min, and the error does not exceed ±25%
Before each loading, the sample status must be checked to ensure that there is no damage
The moisture content determination must be completed within 24 hours after the test

More samples: NB/T 47013.2-2015 GB 18306-2015 QC/T 942-2021

Sample only — not a preview of GB/T 15777-2017