Bayesian inference as a tool for improving estimates of effective elastic parameters of wood

Šejnoha, Michal; Janda, Tomáš; Vorel, Jan; Kucíková, Lucie; Padevět, Pavel; Hrbek, Vladimír

doi:10.1016/j.compstruc.2019.03.006

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…• In case of the Mori-Tanaka method the properly chosen type and shape of the inclusion representing lumens plays a crucial role particularly when searching for effective moisture diffusivities. Such a statement has recently been supported by the results presented in [5,36].…”

Section: Numerical Examples and Resultssupporting

confidence: 55%

“…Both issues are being currently addressed and the results will be presented elsewhere. Some initiatives can be found in [11,5,36].…”

Section: Numerical Examples and Resultsmentioning

confidence: 99%

“…• Attention also deserves prediction of the microfibril angle from nanoindentation measurements recently discussed in [36] with attention to the estimation of experimental error with the help of Bayesian inference. Such an error can be significant and may have a considerable effect on the final prediction of the searched effective properties.…”

Section: Numerical Examples and Resultsmentioning

confidence: 99%

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Effective material properties of wood based on homogenization

Šejnoha¹,

Kucíková²,

Vorel³

et al. 2019

Int. J. CMEM

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This paper is concerned with the evaluation of effective material properties of wood. Since both mechanical loading and climatic changes play a crucial role in the prediction of wood response, we consider not only stiffness, but also non-mechanical properties driving the heat and moisture transport and thus indirectly addressing the swelling and shrinkage properties of wood. In this regard, classical micromechanical models as well as numerical simulations based on the Extended Finite Element Method are examined. A special attention is devoted to the influence of microstructural details of the porous phase. To that end, the X-ray computational micro-tomography is adopted when seeking for information beyond the volume fraction of phases that can be identified at various levels of a hierarchical arrangement of wood. A spruce wood is selected as one particular example to compare individual computational approaches.

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Section: Numerical Examples and Resultssupporting

confidence: 55%

“…Both issues are being currently addressed and the results will be presented elsewhere. Some initiatives can be found in [11,5,36].…”

Section: Numerical Examples and Resultsmentioning

confidence: 99%

Section: Numerical Examples and Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effective material properties of wood based on homogenization

Šejnoha¹,

Kucíková²,

Vorel³

et al. 2019

Int. J. CMEM

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show abstract

“…Such findings, apart from the reduction of moisture, can be supported by increasing volume fraction of crystalline cellulose at the expense of amorphous cellulose and hemicellulose degradation at high temperatures below 200 • C [1,9]. Thermal degradation of hemicellulose may, on the other hand, reduce the load shearing capacity of lignin-hemicellulose matrix [8] acting as a bonding agent in the fibrous like cell wall composite [3,4], which in turn increases its brittleness and reduces the overall strength.…”

Section: Introductionmentioning

confidence: 99%

“…Although heat treatment is often desirable to increase the wood dimensional stability and biological resistance, an exposition to high temperatures may cause a considerable loss of wood strength and ductility attributed merely to a permanent degradation of wood microstructure [1,2]. Considerable research activity addressing the wood response, both immediate and residual, when subjected to high temperatures is therefore unsurprising also considering a significant variability in material properties of wood, both mechanical [3,4] and physical [5].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Spruce Wood Extracted from GLT Beams Loaded by Fire

et al. 2021

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Heating wood to high temperature changes either temporarily or permanently its physical properties. This issue is addressed in the present contribution by examining the effect of high temperature on residual mechanical properties of spruce wood, grounding on the results of full-scale fire tests performed on GLT beams. Given these tests, a computational model was developed to provide through-thickness temperature profiles allowing for the estimation of a charring depth on the one hand and on the other hand assigning a particular temperature to each specimen used subsequently in small-scale tensile tests. The measured Young’s moduli and tensile strengths were accompanied by the results from three-point bending test carried out on two groups of beams exposed to fire of a variable duration and differing in the width of the cross-section, b=100 mm (Group 1) and b=160 mm (Group 2). As expected, increasing the fire duration and reducing the initial beam cross-section reduces the residual bending strength. A negative impact of high temperature on residual strength has also been observed from simple tensile tests, although limited to a very narrow layer adjacent to the charring front not even exceeding a typically adopted value of the zero-strength layer d0=7 mm. On the contrary, the impact on stiffness is relatively mild supporting the thermal recovery property of wood.

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