Orthotropic elastic–plastic–damage model of beech wood based on split Hopkinson pressure and tensile bar experiments

Šebek, František; Kubík, Petr; Tippner, Jan; Brabec, Martin

doi:10.1016/j.ijimpeng.2021.103975

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…Hong et al [31] describe a simplified non-linear orthotropic model of wood by reducing the number of parameters from 27 (for the general orthotropic bi-linear model) to six, with the experimental validation in compression [19], where E t is defined as a fixed small fraction (0.001) of the E. Using an E-P model, Milch et al [23] describe the mechanical properties of dried wood by experimental and numerical methods by doing compression tests parallel and perpendicular to the grain in different directions, a three-point bending test and double shear joints with FEM. Šebek et al [32] use an orthotropic non-linear model of beech wood based on split Hopkinson pressure and tensile bar experiments to reflect the anisotropic behaviour for tensile/compressive asymmetry. Tippner et al [24] describe an orthotropic E-P model for oak wood at two different MC levels applicable for FEM.…”

Section: Introductionmentioning

confidence: 99%

Elasto-plastic material model of green beech wood

Zlámal,

Mařík,

Vojáčková

et al. 2024

J Wood Sci

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Physically modelling the mechanical response of a tree by numerical simulation depends on having accurate data on the mechanical properties of green hardwood. Lacking such data, we developed and validated an orthotropic elasto-plastic (E–P) material model, based on the results of experiments performed on European beech (Fagus sylvatica L.) green wood, capable of including both the non-linearity and orthotropic properties of the material. We selected 655 clear samples with the special orthotropic structure of annual rings. All samples were prepared immediately after felling; their moisture content (MC) was 80% on average. The mechanical responses in normal directions and shear are represented by bi-linear stress–strain curves. The E–P model was validated by comparing the force–deflection response of three-point bending of green wood samples in a finite-element method (FEM) simulation (the average relative error was 4.6% for point-wise and 1.7% for integral-wise comparison). The output of this work was a consistent set of material constants for the E–P material model that is now available for the structural analysis of beech wood with MC above to fibre saturation point (FSP), especially green wood, subjected to relatively high loads (such that a plastic deformation appears) and that can very well predict a non-linear response above the proportional limits.

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Section: Introductionmentioning

confidence: 99%

Elasto-plastic material model of green beech wood

Zlámal,

Mařík,

Vojáčková

et al. 2024

J Wood Sci

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Linear woodcutting of European beech: experiments and computations

et al. 2022

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Hardwood species are becoming increasingly important with the growing need for a diversity of forests that have recently been facing global temperature changes or conifer pests. This further leads to the growth of its potential as a building material that may originate from sustainable production. As hardwoods need to be properly processed, the article deals with the disintegration of European beech. The influence of wood grain direction, uncut chip thickness and cutting speed on the cutting force magnitudes was experimentally investigated using the device with a rotating arm of approximately 4 m in diameter. Then, the disintegration process was modelled using the finite element method in Abaqus/Explicit. The developed material model consisting of orthotropic elasticity and plasticity with rate-independent and rate-dependent tensile–compressive failure asymmetry was implemented through the user subroutine, while the crack initiation and propagation were realized using the element deletion technique. The computationally predicted average values of cutting forces and chip shapes were, except for a few tests, in good agreement with the experiments. It means that the model may be used for further investigation, such as the influence of tool wear.

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A VFM-based identification method for the dynamic anisotropic plasticity of sheet metals

Yang

Nie

et al. 2022

International Journal of Mechanical Sciences

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Orthotropic elastic–plastic–damage model of beech wood based on split Hopkinson pressure and tensile bar experiments

Cited by 5 publications

References 30 publications

Elasto-plastic material model of green beech wood

Elasto-plastic material model of green beech wood

Linear woodcutting of European beech: experiments and computations

A VFM-based identification method for the dynamic anisotropic plasticity of sheet metals

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