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Effect of Green Density Values on Pinus radiata Stiffness Estimation using a Stress-wave Technique

Wielinga, Benjamin; Raymond, Carolyn; James, Ryde; Matheson, A. Colin

Description

Use of acoustic tools for assessing stiffness of green wood in standing trees relies on the assumption of a constant value for wood density. This study examined the variability in the green density of the outerwood (outer 5 rings) of 13-year-old Pinus radiata D.Don trees and determined the error introduced by using a constant value. Assuming a constant green density introduced a small (~3%) error in the calculated modulus of elasticity (i.e. density 'as measured' x acoustic velocity2). Acoustic...[Show more]

dc.contributor.authorWielinga, Benjamin
dc.contributor.authorRaymond, Carolyn
dc.contributor.authorJames, Ryde
dc.contributor.authorMatheson, A. Colin
dc.date.accessioned2015-12-07T22:38:40Z
dc.identifier.issn0048-0134
dc.identifier.urihttp://hdl.handle.net/1885/23529
dc.description.abstractUse of acoustic tools for assessing stiffness of green wood in standing trees relies on the assumption of a constant value for wood density. This study examined the variability in the green density of the outerwood (outer 5 rings) of 13-year-old Pinus radiata D.Don trees and determined the error introduced by using a constant value. Assuming a constant green density introduced a small (~3%) error in the calculated modulus of elasticity (i.e. density 'as measured' x acoustic velocity2). Acoustic velocity was the dominant term in the equation. Green density of the fresh core samples showed little variation (coefficient of variation = 2.8%) and was more strongly determined by the sample's moisture saturation than the amount of wood material (basic density). Modulus of elasticity was inversely related to diameter at 1.3 m (R2 = 0.20). Basic density and fresh moisture content were inversely related (R2 = 0.82). Basic density and fresh moisture content both influenced the acoustic velocity (R2 ~ 0.07), but their effects were weak and opposite. The effect on the acoustic velocity of fresh moisture content at a level between 110% and 230% was less than found previously at lower fresh moisture contents.
dc.publisherScion
dc.sourceNew Zealand Journal of Forestry Science
dc.subjectKeywords: Basic density; Dynamic modulus of elasticity; Moisture content; Pinus radiata; Standing tree acoustic tools; Acoustic wave velocity; Acoustic wave velocity measurement; Acoustics; Elastic moduli; Elasticity; Moisture; Moisture determination; Stiffness; Fo Basic density; Dynamic modulus of elasticity; Moisture content; Pinus radiata; Standing tree acoustic tools
dc.titleEffect of Green Density Values on Pinus radiata Stiffness Estimation using a Stress-wave Technique
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume39
dc.date.issued2009
local.identifier.absfor070508 - Tree Nutrition and Physiology
local.identifier.ariespublicationu4474437xPUB27
local.type.statusPublished Version
local.contributor.affiliationWielinga, Benjamin, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationRaymond, Carolyn, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationJames, Ryde, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationMatheson, A. Colin, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage71
local.bibliographicCitation.lastpage79
dc.date.updated2016-02-24T11:09:36Z
local.identifier.scopusID2-s2.0-67650902375
CollectionsANU Research Publications

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