Finite-element-based moisture transport model for wood including free water above the fiber saturation point

Autengruber, Maximilian; Lukacevic, Markus; Füssl, Josef

doi:10.1016/j.ijheatmasstransfer.2020.120228

Cited by 44 publications

(53 citation statements)

References 46 publications

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“…In [9] wird das Multi‐Ficksche Modell erstmals mit dem Transport des freien Wassers oberhalb des FSP kombiniert. Damit existiert nun ein einheitliches Modell, welches alle Phasen des Wassers in Holz unabhängig voneinander beschreiben kann.…”

Section: Einführungunclassified

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Computergestützte Modellierung von Feuchtetransportprozessen in Holzwerkstoffen

et al. 2022

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Dieser Beitrag präsentiert computergestützte Modellierungskonzepte zur Vorhersage von Feuchteverläufen und zugehörigen Spannungsfeldern sowie zur numerischen Bestimmung potenzieller Risstiefen von Holzbauteilen. Die vorgestellten Konzepte werden anhand experimenteller Versuchsprogramme validiert und die damit einhergehenden Herausforderungen diskutiert. Ausgewählte Ergebnisse zeigen letztendlich die Möglichkeiten und auch die Relevanz solcher Methoden für den Ingenieurholzbau auf.

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Section: Einführungunclassified

“…Zur Validierung des Modells werden Experimente und Simulationen aus der Literatur im nächsten Abschnitt vorgestellt. Die Werte der Materialparameter und die beschreibenden Gleichungen sind in [9] angegeben.…”

Section: Finite‐elemente‐basiertes Simulationskonzeptunclassified

Computergestützte Modellierung von Feuchtetransportprozessen in Holzwerkstoffen

et al. 2022

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“…When the wood moisture is below the saturation point (U < Us), diffusion of water vapor in the lumens and bound water in the cell walls takes place. These two phases are not necessarily in local equilibrium and can be coupled via the sorption rate [54]. In this interval, the stored water has a decisive influence on the physical-mechanical characteristics of the wood [34,52].…”

Section: Measurement Of Moisture Contentmentioning

confidence: 99%

Prediction of Maritime Pine Boards Modulus of Elasticity by Means of Sonic Testing on Green Timber

Concu

2021

Applied Sciences

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Timber buildings are experiencing a rapid diffusion due to their good performance and their sustainability; however, some steps of structural timber production process, such as drying, are energy-intensive and environmentally impactful, and many wood species are also affected by low yield. Therefore, it would be important to determine the quality of the green material, that is, in wet condition, before undergoing the most impactful and expensive production steps. This paper describes a research aimed at quantifying the variation of the dynamic modulus of elasticity MoEdyn, which is commonly used for structural timber mechanical grading, from wet to dry condition in Sardinian maritime pine boards to be used for the production of laminated timber, and to examine the relationship between wet and dry MoEdyn. The MoEdyn was determined from measurements of the velocity of sonic waves propagating through the boards. The results show that the dry MoEdyn can be estimated starting from boards sonic testing in the wet condition, so providing a basis for implementing Sardinian maritime pine pre-grading in order to obtain the reduction of manufacturing costs, the abatement of environmental impact, and the increase of structural grade yield.

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“…Consequently, hygro-mechanical modeling is becoming increasingly important. Numerous hygro-mechanical modeling studies are conducted for wood-based materials [9][10][11][12] and for polymeric materials [13][14][15], but there is very little research on predicting the time-dependent hygro-mechanical behaviours of WPC. There is particularly little research that attempts to accurately predict the three-dimensional anisotropic responses of WPC subjected to water absorption.…”

Section: Introductionmentioning

confidence: 99%

A Novel Space-Time Finite Element Algorithm to Investigate the Hygro-Mechanical Behaviours of Wood Fiber-Polymer Composites

Charupeng¹,

Kunthong²

2022

MMEP

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Moisture-induced swelling, or hygroexpansion, has been known to greatly deteriorate the durability of wood fiber-polymer composites (WPC). It is generally very expensive to perform experiments to completely obtain the diffusion kinetics as the process occurs in a very extended period of time. For the first time, we have developed a space-time finite element algorithm that employs time discontinuous Galerkin (TDG) method for time-dependent 3D hygro-mechanical behaviours of WPC. The formulation of matrix equations in spatial and temporal domains are explained in detail. A block Gauss-Seidel iterative method is used in the predictor/multi-corrector multi-pass algorithm, which efficiently yields unconditionally stable and high-order accurate solutions. The model is validated by comparing the predicted time-dependent hygroexpansion with that obtained in a previous experimental study. The quantitative analysis ensures the reliability of model, based on a Fickian diffusion process. With our adaptive time-stepping scheme that bases on the embedded solution from the multi-pass iterations, the model efficiently progresses the kinetics with relatively large time steps. A runtime of a few hours compared to about three months of actual laboratory experimentation confirms the novelty and robustness of our model.

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Finite-element-based moisture transport model for wood including free water above the fiber saturation point

Cited by 44 publications

References 46 publications

Computergestützte Modellierung von Feuchtetransportprozessen in Holzwerkstoffen

Computergestützte Modellierung von Feuchtetransportprozessen in Holzwerkstoffen

Prediction of Maritime Pine Boards Modulus of Elasticity by Means of Sonic Testing on Green Timber

A Novel Space-Time Finite Element Algorithm to Investigate the Hygro-Mechanical Behaviours of Wood Fiber-Polymer Composites

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