Microfracture in wood monitored by confocal laser scanning microscopy

Dill-Langer, Gerhard; Lutze, Steffen; Aicher, Simon

doi:10.1007/s00226-002-0151-7

Cited by 34 publications

(26 citation statements)

References 9 publications

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“…After crack initiation a perfect brittle damage evolution is assumed, meaning that the transferable traction stresses drop almost immediately to zero (displacement from crack initiation to stress free crack surfaces is set to 10´5 µm). Numerical simulations confirmed that the chosen values are able to reproduce the known two main fracture mechanisms for spruce in the RT -plane, which are fiber debonding for the thick-walled latewood cell loaded in T -direction and cell wall rupture for the thin-walled earlywood cells under a load in R-direction [7,10].…”

Section: Cell Wallsupporting

confidence: 69%

Failure mechanisms of clear wood identified at wood cell level by an approach based on the extended finite element method

Lukacevic

Füssl

Lampert

2015

Engineering Fracture Mechanics

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Section: Cell Wallsupporting

confidence: 69%

Failure mechanisms of clear wood identified at wood cell level by an approach based on the extended finite element method

Lukacevic

Füssl

Lampert

2015

Engineering Fracture Mechanics

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“…Scanning electron microscopy of fracture surfaces has shown that the bridging behind the crack tip is a toughening mechanism in wood fracture which contributes to its nonlinear behavior . The alternation of earlywood and latewood fibers which have different microstructure, dimensions and stiffness can play an important role on the pattern of crack propagation (Boatright and Garrett 1983;Job and Navi 1996;Dill-Langer et al 2002).…”

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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“…(44). An alternative to direct observation of checks is to propagate radial cracks in the transverse plane [30]. The goal would be to monitor energy release rate during crack propagation and potentially resolve the toughness as a function of position and changes in toughness between earlyand latewood zones.…”

Section: Finite Fracture Mechanics For Internal Checkingmentioning

confidence: 99%

Polar shear-lag analysis of a composite of concentric cylinders with longitudinal cracks: Application to internal checking in wood

Nairn

2010

Composites Part A: Applied Science and Manufacturing

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Composites of concentric cylinders can fail by microcracks that span the thickness and length of one cylinder but arrest at the boundary to adjacent cylinders. This failure mode was analyzed by developing a new polar shear-lag analysis for stresses in a cross section of a concentric-cylinder composite. The analysis can accurately calculate stresses in each cylinder in the presence of microcracks. These stresses were used to calculate the energy release rate for formation of a new microcrack as a tool for predicting the microcracking process due to any source of applied or residual stresses. The target problem was to model internal checking in certain species of trees. In a tree, the alternating regions of early-and latewood that form the growth rings are the concentric cylinders. Internal checking is microcracking in the earlywood layers. The shear-lag analysis was used to predict the propensity of growth rings to form internal checks.

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Microfracture in wood monitored by confocal laser scanning microscopy

Cited by 34 publications

References 9 publications

Failure mechanisms of clear wood identified at wood cell level by an approach based on the extended finite element method

Failure mechanisms of clear wood identified at wood cell level by an approach based on the extended finite element method

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

Polar shear-lag analysis of a composite of concentric cylinders with longitudinal cracks: Application to internal checking in wood

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