NDLI: Time dependence of Poisson’s effect in wood IV: influence of grain angle

Content Provider	Springer Nature Link
Author	Kawahara, Ken Ando, Kosei Taniguchi, Yusuke
Copyright Year	2015
Abstract	Off-axis tensile creep tests were conducted on woods taken from Japanese cypress and Kalopanax by changing the angle of load to the grain direction in the longitudinal–tangential (LT) plane. The dependence of the Poisson’s ratio and trend of the viscoelastic Poisson’s ratio on grain angle were investigated. The Poisson’s ratios were found to reach their extrema when the grain angle was around 30°. Moreover, the Poisson’s ratio in the LT plane was observed to be negative when the grain angle was in the range of 15°–45°. Comparing the experimental results with theoretical values obtained from the theory of orthotropic elasticity, it was revealed that, although the Poisson’s ratio reached an extremum in both cases, the specific values did not match, especially when the angle was between 15° and 45°. Furthermore, the temporal variation of the viscoelastic Poisson’s ratio was found to depend on the grain angle and the measurement plane. It also appeared to be affected by the Poisson’s ratio, showing an increasing tendency above a specific Poisson’s ratio (Japanese cypress: 0.196, Kalopanax: 0.102) and a decreasing tendency below it, regardless of the grain angle and measurement plane. Additionally, the increment in the viscoelastic Poisson’s ratio after 24 h of creep was observed to reach its extremum when the grain angle was around 30°. Finally, by improving the six-element Frandsen–Muszynski viscoelastic model, which simultaneously considers the longitudinal and transverse strains, an eight-element model was presented, and the trend of the viscoelastic Poisson’s ratio was well reproduced by this model.
Starting Page	372
Ending Page	383
Page Count	12
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	61
Issue Number	4
e-ISSN	16114663
Language	English
Publisher	Springer Japan
Publisher Date	2015-04-12
Publisher Place	Tokyo
Access Restriction	Subscribed
Subject Keyword	Poisson ratio Grain angle Shear effect Viscoelasticity Creep Wood Science & Technology Materials Science Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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Time dependence of Poisson’s effect in wood IV: influence of grain angle

Time dependence of Poisson’s effect in wood I: the lateral strain behavior

Time dependence of Poisson’s effect in wood II: volume change during uniaxial tensile creep

Time dependence of Poisson’s effect in wood III: asymmetry of three-dimensional viscoelastic compliance matrix of Japanese cypress

Determination of three-dimensional viscoelastic compliance in wood by tensile creep test

Time dependence of Poisson’s effect in wood III: asymmetry of three-dimensional viscoelastic compliance matrix of Japanese cypress

Influence of a wide range of moisture contents on the Poisson’s ratio of wood

Twist of wood studs: dependence on spiral grain gradient

Abrasive wear properties of compressed sugi wood

Time dependence of Poisson’s effect in wood IV: influence of grain angle

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