Coupled Experiments and Simulations of Microstructural Damage in Wood

Landis, Eric N.; Vasić, Svetlana; Davids, William G.; Parrod, Perrine

doi:10.1177/001448502321548210

Cited by 16 publications

(22 citation statements)

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“…Lattice fracture model has been applied for investigating the mechanism of fracture in concrete and sandstone for several years (VanMier 1996;Schlangen and Garboczi 1997;Prado and VanMier 2003). Using this approach, Landis et al (2002) developed a two-dimensional lattice model to study the mode I fracture of a notched wood specimen Davids et al 2003). The results of their model, which simulated the wood fracture at growth ring level (each wood bundle was represented by a lattice element), showed the convenience of morphological based models for investigating wood fracture and predicting the force-displacement curves and crack propagation paths.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical approach to wood fracture by three-dimensional mixed lattice-continuum model at fiber level

Sedighi-Gilani

Navi

2007

Wood Sci Technol

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To investigate the fracture behavior of wood, the porosity and heterogeneities of its microstructure should be taken into account. Considering these features of wood microstructure in a continuum-based model is still a difficult problem and the lattice model might be an alternative. In the developed mixed lattice-continuum model, the probable crack propagation volume was modeled by defining a three-dimensional lattice of different beam elements and the other regions were considered as continuum medium. Different beam elements of lattice represented the earlywood fibers, latewood fibers, ray cells and bonding medium between the fibers. The proposed model was used to investigate the mechanism of mode I fracture in a small notched wood specimen in RL orientation. The resulting pre-peak and softening curve and also the crack opening trajectory in both cross-section and longitudinal-section in model were in good agreement with the experimental observations. This model shows the importance of considering the three-dimensional and distributed propagation of microcracks and main cracks in fracture stability. It was also shown that in mode I fracture, RL orientation, the main crack propagates in the earlywood ring.

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Section: Introductionmentioning

confidence: 99%

Micromechanical approach to wood fracture by three-dimensional mixed lattice-continuum model at fiber level

Sedighi-Gilani

Navi

2007

Wood Sci Technol

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“…The thought behind the approach is that statistical variations and disorder can be explicitly represented in a way that resembles the actual material. The approach was applied to wood materials (Landis et al 2002;Davids et al 2003;Fournier et al 2007) assigned depending on whether the elements are representing earlywood or latewood, and on their orientation (radial or longitudinal). Disorder is introduced through statistical variations in element properties and with geometric perturbations from regular lattice geometry.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Acoustic emission measurements and lattice simulations of microfracture events in spruce

2010

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A statistical lattice model was developed to investigate the energy associated with damage and failure of wood. The model incorporates several important morphological aspects of wood such as grain direction, early wood percentage and grain geometry. The model was developed to investigate progressive damage under enforced boundary displacements and has been adapted to predict fracture energy related phenomena. In this particular study, notched specimens were loaded in uniaxial tension while monitored by a passive acoustic emission (AE) measurement system. The energy associated with the mechanical damage was measured by the AE instruments and compared with the energy released by ruptured elements in the lattice model. Cumulative energy release was tracked as a function of specimen load and deformation in both model and experiment. A ratio was established between the cumulative AE energy released at the first drop in load and the cumulative fracture energy released when the model load-deformation relationship becomes significantly nonlinear. An additional ratio was established between the total fracture energy measured prior to 50% of peak strain and the total fracture energy measured prior to peak strain. The magnitudes of these energy release ratios vary owing to a change in failure modes between the short model and the larger specimens; however, the shape of the AE energy release curve up to failure coincides well with that predicted by the model simulations.

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“…Mode I fracture experiments were performed on small softwood samples in the RT orientation, and initiation and propagation of cracks was observed by confocal laser scanning microscopy. A three-dimensional (3D) mixed lattice-continuum fracture model, based on lattice fracture models of Van Mier (1996) for concrete and sandstone and Landis et al (2002), considers the porosity of wood and heterogeneities at the fibre level. Numerical and experimental results are compared, and the stress-displacement curves and crack opening displacements show good agreement.…”

Section: Fracture At Cellular Levelmentioning

confidence: 99%

Fracture behaviour of wood and its composites. A review COST Action E35 2004–2008: Wood machining – micromechanics and fracture

Stanzl-Tschegg

Navi

2008

HFSG

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Fracturing of wood and its composites is a process influenced by many parameters, on the one hand coming from the structure and properties of wood itself, and on the other from influences from outside, such as loading mode, velocity of deformation, moisture, temperature, etc. Both types of parameters may be investigated experimentally at different levels of magnification, which allows a better understanding of the mechanisms of fracturing. Fracture mechanical methods serve to quantify the fracture process of wood and wood composites with different deformation and fracturing features. Since wood machining is mainly dominated by the fracture properties of wood, knowledge of the different relevant mechanisms is essential. Parameters that influence the fracture process, such as wood density, orientation, loading mode, strain rate and moisture are discussed in the light of results obtained during recent years. Based on this, refined modelling of the different processes becomes possible.

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Coupled Experiments and Simulations of Microstructural Damage in Wood

Cited by 16 publications

References 0 publications

Micromechanical approach to wood fracture by three-dimensional mixed lattice-continuum model at fiber level

Micromechanical approach to wood fracture by three-dimensional mixed lattice-continuum model at fiber level

Acoustic emission measurements and lattice simulations of microfracture events in spruce

Fracture behaviour of wood and its composites. A review COST Action E35 2004–2008: Wood machining – micromechanics and fracture

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