Effects of systematic variation of wood adherend bending stiffness on fracture properties: Part 1. Influence of grain angle
-
Edoardo Nicoli
and
Charles E. Frazier
Abstract
When wood beams are bonded to form double cantilever beam (DCB) specimens, the resulting fracture properties are often quite scattered. Random variations of properties of wood are usually considered as the reason for the data scatter, but there are also morphological aspects that can possibly be accounted for. The present paper focuses on these morphological aspects and, in particular, an analytical model has been developed for evaluating how the orientation and stiffness of the layers of beams of constant cross section influences the stiffness variation of the beam along its length. Wood in DCBs is a common example of a material with oriented layers resulting from the alternating earlywood (EW) and latewood (LW). Part of the paper is dedicated to Douglas fir (Pseudotsuga menziesii), where the variability of equivalent elastic stiffness is found to be on the order of ±6–8% in bonded DCBs, depending on grain orientation. Other representative cases of bonded wood beams are also presented, where the stiffness variability is on the order of ±15–20%. Part 2 of this paper will evaluate how these levels of elastic stiffness variations influence the measured critical strain energy release rate, 
.
©2012 by Walter de Gruyter Berlin Boston
Articles in the same Issue
- Masthead
- Masthead
- Original Papers
- Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 1. Syntheses and characterizations
- Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 2. Action in soda pulping conditions on softwood and phenolic β-O-4 lignin models
- Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 3. Delignification of softwood and action on a phenolic β-O-4 lignin model in kraft pulping conditions
- Analysis of fibre deformation processes in high-consistency refining based on Raman microscopy and X-ray diffraction
- Distribution of wood polymers within the cell wall of transgenic aspen imaged by Raman microscopy
- Chemical improvement of surfaces. Part 2: Permanent hydrophobization of wood by covalently bonded fluoroorganyl substituents
- Testing of the superhydrophobicity of a zinc oxide nanorod array coating on wood surface prepared by hydrothermal treatment
- Properties of molding plates made with albizia wood particles impregnated with alcohol-soluble PF resins prepared from phenol-liquefied lignins
- Within-ring movement of free water in dehydrating Norway spruce sapwood visualized by neutron radiography
- Influence of hygromechanical history on the longitudinal mechanosorptive creep of wood
- Effects of systematic variation of wood adherend bending stiffness on fracture properties: Part 1. Influence of grain angle
- Effects of systematic variation of wood adherend bending stiffness on fracture properties. Part 2. Revisiting traditional DCB analysis methods
- Determination of adhesive energy at the wood cell-wall/UF interface by nanoindentation (NI)
- Short Notes
- Distribution of extracts including 4,8-dihydroxy-5-methoxy-2-naphthaldehyde in Diospyros kaki analyzed by gas chromatography-mass spectrometry and time-of-flight secondary ion mass spectrometry
- Southern pine impregnated with silicate solution containing cellulose nanofibrils
- Meetings
- Meetings
Articles in the same Issue
- Masthead
- Masthead
- Original Papers
- Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 1. Syntheses and characterizations
- Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 2. Action in soda pulping conditions on softwood and phenolic β-O-4 lignin models
- Anthraquinone polymer catalysts for alkaline delignification of lignocellulosic matter. Part 3. Delignification of softwood and action on a phenolic β-O-4 lignin model in kraft pulping conditions
- Analysis of fibre deformation processes in high-consistency refining based on Raman microscopy and X-ray diffraction
- Distribution of wood polymers within the cell wall of transgenic aspen imaged by Raman microscopy
- Chemical improvement of surfaces. Part 2: Permanent hydrophobization of wood by covalently bonded fluoroorganyl substituents
- Testing of the superhydrophobicity of a zinc oxide nanorod array coating on wood surface prepared by hydrothermal treatment
- Properties of molding plates made with albizia wood particles impregnated with alcohol-soluble PF resins prepared from phenol-liquefied lignins
- Within-ring movement of free water in dehydrating Norway spruce sapwood visualized by neutron radiography
- Influence of hygromechanical history on the longitudinal mechanosorptive creep of wood
- Effects of systematic variation of wood adherend bending stiffness on fracture properties: Part 1. Influence of grain angle
- Effects of systematic variation of wood adherend bending stiffness on fracture properties. Part 2. Revisiting traditional DCB analysis methods
- Determination of adhesive energy at the wood cell-wall/UF interface by nanoindentation (NI)
- Short Notes
- Distribution of extracts including 4,8-dihydroxy-5-methoxy-2-naphthaldehyde in Diospyros kaki analyzed by gas chromatography-mass spectrometry and time-of-flight secondary ion mass spectrometry
- Southern pine impregnated with silicate solution containing cellulose nanofibrils
- Meetings
- Meetings
