Variation of Drying Strains between Tangential and Radial Directions in Asian White Birch

被引：16

作者：

Fu, Zongying ^{[1
]}

Zhao, Jingyao ^{[1
]}

Yang, Yeli ^{[1
]}

Cai, Yingchun ^{[1
]}

机构：

[1] Northeast Forestry Univ, Coll Mat Sci & Engn, Minist Educ, Key Lab Biobased Mat Sci & Technol, Harbin 150040, Peoples R China

来源：

FORESTS | 2016年 / 7卷 / 03期

基金：

中国国家自然科学基金;

关键词：

wood rheological behavior; drying stresses; drying strains; white birch disk; MECHANOSORPTIVE CREEP; MOISTURE-CONTENT; TIMBER LOGS; SHRINKAGE; WOOD; STRESS; BEHAVIOR; SPECIMENS; HEMLOCK; FIELD;

D O I：

10.3390/f7030059

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

In this study, wood disks of 30 mm in thickness cut from white birch (Betula platyphylla Suk) logs were dried at a constant temperature (40 degrees C). The drying strains including practical shrinkage strain, elastic strain, viscoelastic creep strain and mechano-sorptive creep were measured both tangentially and radially. The effects of moisture content and radial position on each strain were also discussed qualitatively. Overall, the difference of the practical shrinkage strain between the tangential and radial directions was proportional to the distance from the pith. The tangential elastic strain and viscoelastic creep strain were higher than these strains in a radial direction, and they all decreased with the decrease of moisture content. Additionally, there were opposite mechano-sorptive creep between tangential and radial directions.

引用

页数：8

共 20 条

[1]

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