Effect of Minimum Suppression and Maximum Release Years on Compression Parallel to Grain Strength and Specific Gravity for Small-sized Yellow-poplar (Liriodendron tulipifera L.) Specimens

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dc.contributor.authorMettanurak, Thammaraten
dc.contributor.committeechairZink-Sharp, Audrey G.en
dc.contributor.committeecochairLoferski, Joseph R.en
dc.contributor.committeememberZedaker, Shepard M.en
dc.contributor.committeememberCopenheaver, Carolyn A.en
dc.contributor.departmentWood Science and Forest Productsen
dc.date.accessioned2014-03-14T20:44:20Zen
dc.date.adate2008-09-23en
dc.date.available2014-03-14T20:44:20Zen
dc.date.issued2008-04-04en
dc.date.rdate2011-01-03en
dc.date.sdate2008-08-27en
dc.description.abstractSeveral researchers have concluded that there is little or no relationship between specific gravity and ring width or growth rate in yellow-poplar (Liriodendron tulipifera L.). Because most mechanical properties of wood are also closely related to specific gravity, it would thus be of interest to learn how minimum suppression and maximum release years' evidence that can be extracted from radial growth patterns based on a modified radial growth averaging (RGA) technique's influence the compression parallel to grain strength and specific gravity of wood. This study is designed to evaluate the effects of growth suppression and release on ultimate crushing stress and specific gravity for small-sized yellow-poplar specimens. Additionally, the relationship between specific gravity and ultimate crushing stress is investigated. Twenty-three yellow-poplar cores were examined for their growth ring widths. Minimum suppression and maximum release years were identified based on the modified RGA criteria method. From each increment core, three 1 Ã 1 Ã 4 mm specimens from both minimum suppression and maximum release years were tested for their ultimate crushing stresses using a micro-mechanical test system. The specific gravity of each specimen was also recorded. These data were analyzed using a paired samples t test and a simple linear regression. The results indicate that the mean ultimate crushing stress and specific gravity of maximum release years were significantly higher than that of minimum suppression years. Furthermore, the ultimate crushing stress was linearly related to the specific gravity of the specimens.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-08272008-150214en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08272008-150214/en
dc.identifier.urihttp://hdl.handle.net/10919/34804en
dc.publisherVirginia Techen
dc.relation.haspartThesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectring widthen
dc.subjecttree ringsen
dc.subjectsuppression yearsen
dc.subjectultimate crushing strengthen
dc.subjectcompression parallel to grainen
dc.subjectLiriodendron tulipifera L.en
dc.subjectincrement coreen
dc.subjectyellow-poplaren
dc.subjectrelease yearsen
dc.subjectwood specific gravityen
dc.subjectradial growth averaging techniqueen
dc.titleEffect of Minimum Suppression and Maximum Release Years on Compression Parallel to Grain Strength and Specific Gravity for Small-sized Yellow-poplar (Liriodendron tulipifera L.) Specimensen
dc.typeThesisen
thesis.degree.disciplineWood Science and Forest Productsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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