Abstract
Crack-tip displacement fields have been computed based on digital image correlation for spruce (Picea abies [L.] Karst.) and birch (Betula pendula Roth.) wood, which were submitted to pure mode I loading in the RT-direction under both green and air-dried conditions. Moreover, crack propagation was modeled based on both linear elastic fracture mechanics (LEFM) and nonlinear fracture mechanics, relying on the fictitious crack model (FCM). The measured and modeled load versus the crack-mouth opening displacement (CMOD) curves and displacement fields were compared. In the case of spruce, the load-CMOD curves simulated by the FCM coincide well with the measured ones. On the contrary, measured near crack-tip displacement fields in both green and air-dried spruce are better comparable with the LEFM predictions than with the FCM predictions. In the case of green birch, the simulated FCM curve follows the measured curve quite well, but in air-dried birch the simulated FCM curve has a better fit than the LEFM-curve only before maximum load. In birch, the FCM predicts the displacement fields better than the LEFM. In both species, moisture content has a big effect on the softening behavior. In both spruce and birch, the FCM overestimates the displacements ahead of crack tip, whereas the LEFM model underestimates the displacements.
This work formed part of “E-Wood”, a project supported by the Multidisciplinary Institute of Digitalisation and Energy (http://mide.tkk.fi). The work was also supported by the Academy of Finland (decision number 1127759).
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Articles in the same Issue
- Masthead
- Masthead
- Review
- Novel cellulose-based composites based on nanofibrillated plant and bacterial cellulose: recent advances at the University of Aveiro – a review
- Original Articles
- Quantitative structural characterization of the lignins from the stem and pith of bamboo (Phyllostachys pubescens)
- Fractionation and characterization of lignin-carbohydrate complexes (LCCs) of Eucalyptus globulus in residues left after MWL isolation. Part II: Analyses of xylan-lignin fraction (X-L)
- Alkali consumption of aliphatic carboxylic acids during alkaline pulping of wood and nonwood feedstocks
- Improvement of kraft pulp bleaching by treatments with laccase, urea, and refining
- Development and evaluation of new curing agents derived from glycerol for formaldehyde-free soy-based adhesives in wood composites
- Formation of highly hydrophobic wood surfaces using silica nanoparticles modified with long-chain alkylsilane
- The fracture behavior of birch and spruce in the radial-tangential crack propagation direction at the scale of the growth ring
- Flatwise Young’s modulus and flatwise shear modulus of plywood measured by flexural vibration test
- A numerical and experimental study regarding the influence of some process parameters on the damage state in wood chips
- Treatment of wood with silica sols against attack by wood-decaying fungi and blue stain
- Mimicking of the strength loss in the Vasa: model experiments with iron-impregnated recent oak
- Improved heat insulation system (Mirrorpanel) for construction of wood buildings
- Meetings
- Meetings
Articles in the same Issue
- Masthead
- Masthead
- Review
- Novel cellulose-based composites based on nanofibrillated plant and bacterial cellulose: recent advances at the University of Aveiro – a review
- Original Articles
- Quantitative structural characterization of the lignins from the stem and pith of bamboo (Phyllostachys pubescens)
- Fractionation and characterization of lignin-carbohydrate complexes (LCCs) of Eucalyptus globulus in residues left after MWL isolation. Part II: Analyses of xylan-lignin fraction (X-L)
- Alkali consumption of aliphatic carboxylic acids during alkaline pulping of wood and nonwood feedstocks
- Improvement of kraft pulp bleaching by treatments with laccase, urea, and refining
- Development and evaluation of new curing agents derived from glycerol for formaldehyde-free soy-based adhesives in wood composites
- Formation of highly hydrophobic wood surfaces using silica nanoparticles modified with long-chain alkylsilane
- The fracture behavior of birch and spruce in the radial-tangential crack propagation direction at the scale of the growth ring
- Flatwise Young’s modulus and flatwise shear modulus of plywood measured by flexural vibration test
- A numerical and experimental study regarding the influence of some process parameters on the damage state in wood chips
- Treatment of wood with silica sols against attack by wood-decaying fungi and blue stain
- Mimicking of the strength loss in the Vasa: model experiments with iron-impregnated recent oak
- Improved heat insulation system (Mirrorpanel) for construction of wood buildings
- Meetings
- Meetings