Accuracy of regular wood cell structure model

Sjölund, Johanna; Karakoç, Alp; Freund, Jouni

doi:10.1016/j.mechmat.2014.06.003

Cited by 9 publications

(4 citation statements)

References 16 publications

(12 reference statements)

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“…Astley et al (1998) have modelled the elastic properties of softwood using irregular cells with shell elements and found good agreement with experimental values. Sjölund et al (2014) have studied the accuracy of the model with regular cell geometry, by comparing models with real and regular cell geometries. Those authors found that the error measure for geometric variation was small (between 5 and 13%).…”

Section: Introductionmentioning

confidence: 99%

Mechanistic study of microstructural deformation and stress in steam-exploded softwood

2017

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Steam explosion pretreatment results in the formation of microcracks in the cell walls of wood. In the present study, steam explosion experiments were performed and structural changes in Norway spruce were identified using scanning electron microscopy. The cellular structure of the softwood spruce was simulated using the finite element method, and the effects of pressure generated during the steam explosion pretreatment on the deformation of the cells were investigated. The simulated model included earlywood, latewood, and ray cells. The effects of bordered and cross-field pits on the stresses in the cell wall were studied as well. Many similarities were observed between the microcracks in the steam-exploded wood and the high-stress regions predicted by the model. The experimental and simulation results showed that the radial cell walls in the earlywood cells experienced major deformation. The presence of the pits created stress localization and facilitated the formation of microcracks in the cell walls.

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Section: Introductionmentioning

confidence: 99%

Mechanistic study of microstructural deformation and stress in steam-exploded softwood

2017

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“…In the literature, numerous analytical and computational approaches have been offered to the homogenization problems involving cellular materials (see, e.g., [11][12][13]). Due to advances in theory and hardware, computational homogenization methods have become more frequently used for material characterization.…”

Section: Methodsmentioning

confidence: 99%

Effects of Morphology and Topology on the Effective Stiffness of Chiral Cellular Materials in the Transverse Plane

Karakoç

Taciroğlu

2016

Advances in Materials Science and Engineering

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The present study investigates the influence of topology and morphology on the effective stiffness of chiral cellular materials in the transverse plane by means of a homogenization method. For this purpose, finite element models of representative volume elements for regular hexagonal and hexagonal-chiral configurations are used and simulations are conducted to quantify how cell topology—that is, chirality inside the cell—and cell wall slenderness affect the effective stiffness. Closed form solutions for regular hexagonal square and triangular RVEs provided in the literature are then taken as a basis for model validation. The results indicate that there are drastic differences between regular hexagonal and hexagonal-chiral configurations, which can be explained in terms of deformation mechanism transformations between bending and stretching. The investigations also reveal the positive impact of cell wall slenderness on stiffness due to volumetric increase in the cell wall material resisting the deformation.

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“…The second integrand at the right-hand side  vanishes in case of periodic boundary conditions. Hence, macro-scale stress can be expressed where i refers to the number of experiments [37,38]. Under the assumption of material orthotropy, for three-dimensional case is expressed as…”

Section: U Rmentioning

confidence: 99%