Anisotropic elastic properties of common ash (Fraxinus excelsior L.)
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Sebastian Clauß
Abstract
Hardwoods in principle show a similar orthotropic behavior as softwoods; however, the ratios of the mechanical parameters between the three anatomical directions and their magnitudes are different and depend strongly on the individual microstructure of the species. The aim of the current study was to characterize the 3-D elastic behavior of common ash (Fraxinus excelsior L.) by tensile, compression, and shear tests in the three anatomical directions and stepwise in between, by means of a universal testing machine in combination with a digital image correlation technique. Young’s moduli, shear moduli, and Poisson’s ratios have been determined for the different load directions. From studies on the radial-tangential plane of other wood species, it is known that the elastic moduli in the principal directions and the off-axis elastic moduli vary in a nonlinear correlation, depending on density gradients between earlywood and latewood. This angular dependency has been experimentally and theoretically proven for ash. Furthermore, the dependency of mechanical parameters on the fiber-load angle has been experimentally determined. The measurements for principal and off-axis load directions provide a sound basis for modeling of hardwood structures.
Acknowledgments
The authors thank Mr. Thomas Schnider for his accurate preparation of the specimens and Dr. Stefan Hering for his support with the tensor trasformation algorithms.
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©2014 by De Gruyter
Articles in the same Issue
- Frontmatter
- Original Articles
- Influence of cellulose supramolecular structure on strength properties of chemical pulp
- Morphological, mechanical, and optical properties of cypress papers
- Determination of ion exchange constants for pairs of metal ions to lignocellulosic materials by column chromatography
- Combustion behavior of oak wood (Quercus mongolica L.) modified by 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU)
- Synthesis and antifungal activity of camphoric acid-based acylhydrazone compounds
- Lignification of ray parenchyma cells in the xylem of Pinus densiflora. Part I: Microscopic investigation by POM, UV microscopy, and TOF-SIMS
- Lignification of ray parenchyma cells in the xylem of Pinus densiflora. Part II: Microchemical analysis by laser microdissection and thioacidolysis
- Distribution of lignin in vascular bundles of coconut wood (Cocos nucifera) by cellular UV-spectroscopy and relationship between lignification and tensile strength in single vascular bundles
- Compression properties of vascular boundles and parenchyma of rattan (Plectocomia assamica Griff)
- Properties of wood-plastic composites (WPCs) reinforced with extracted and delignified wood flour
- Anisotropic elastic properties of common ash (Fraxinus excelsior L.)
- Destructive and non-destructive evaluation of seven hardwoods and analysis of data correlation
- Experimental validation of green wood peeling assisted by IR heating – some considerations of the analytical system design
- The influence of felling season and log-soaking temperature on the wetting and phenol formaldehyde adhesive bonding characteristics of birch veneer
- Comparative evaluation of various lignin determination methods on hemicellulose-rich fractions of spruce and birch obtained by pressurized hot-water extraction (PHWE) and subsequent ultrafiltration (UF)
- Conversion between basic density and apparent density at any moisture content in Eucalyptus grandis
- Postpeak residual capacity of nailed connections of a shear wall
- Obituary
- Memorial on Horst H. Nimz (1930–2013)
Articles in the same Issue
- Frontmatter
- Original Articles
- Influence of cellulose supramolecular structure on strength properties of chemical pulp
- Morphological, mechanical, and optical properties of cypress papers
- Determination of ion exchange constants for pairs of metal ions to lignocellulosic materials by column chromatography
- Combustion behavior of oak wood (Quercus mongolica L.) modified by 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU)
- Synthesis and antifungal activity of camphoric acid-based acylhydrazone compounds
- Lignification of ray parenchyma cells in the xylem of Pinus densiflora. Part I: Microscopic investigation by POM, UV microscopy, and TOF-SIMS
- Lignification of ray parenchyma cells in the xylem of Pinus densiflora. Part II: Microchemical analysis by laser microdissection and thioacidolysis
- Distribution of lignin in vascular bundles of coconut wood (Cocos nucifera) by cellular UV-spectroscopy and relationship between lignification and tensile strength in single vascular bundles
- Compression properties of vascular boundles and parenchyma of rattan (Plectocomia assamica Griff)
- Properties of wood-plastic composites (WPCs) reinforced with extracted and delignified wood flour
- Anisotropic elastic properties of common ash (Fraxinus excelsior L.)
- Destructive and non-destructive evaluation of seven hardwoods and analysis of data correlation
- Experimental validation of green wood peeling assisted by IR heating – some considerations of the analytical system design
- The influence of felling season and log-soaking temperature on the wetting and phenol formaldehyde adhesive bonding characteristics of birch veneer
- Comparative evaluation of various lignin determination methods on hemicellulose-rich fractions of spruce and birch obtained by pressurized hot-water extraction (PHWE) and subsequent ultrafiltration (UF)
- Conversion between basic density and apparent density at any moisture content in Eucalyptus grandis
- Postpeak residual capacity of nailed connections of a shear wall
- Obituary
- Memorial on Horst H. Nimz (1930–2013)
