Finite-element-based prediction of moisture-induced crack patterns for cross sections of solid wood and glued laminated timber exposed to a realistic climate condition

Autengruber, Maximilian; Lukacevic, Markus; Gröstlinger, Christof; Füssl, Josef

doi:10.1016/j.conbuildmat.2020.121775

Cited by 24 publications

(28 citation statements)

References 32 publications

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“…B. [20] die Spannungsverteilung zufolge Holzfeuchtigkeit im Querschnitt ermittelt werden (Bild 5, mittig und rechts).…”

Section: Ingenieurmäßiger Ansatz Zur Ermittlung Von Feuchtegradientenunclassified

“…Das resultierende Holzfeuchtigkeitsfeld wird mit dem des Multi‐Fickschen Transportmodells an den kritischen Zeitpunkten aus [20] verglichen. Es ist zu erkennen, dass die Holzfeuchtigkeiten eine sehr gute Übereinstimmung zeigen, wobei das Feld aufgrund der verwendeten Minimums‐/Maximumsfunktion zu den Ecken hin etwas mehr abweicht.…”

Section: Ingenieurmäßiger Ansatz Zur Ermittlung Von Feuchtegradientenunclassified

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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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“…B. [20] die Spannungsverteilung zufolge Holzfeuchtigkeit im Querschnitt ermittelt werden (Bild 5, mittig und rechts).…”

Section: Ingenieurmäßiger Ansatz Zur Ermittlung Von Feuchtegradientenunclassified

Computergestützte Modellierung von Feuchtetransportprozessen in Holzwerkstoffen

et al. 2022

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“…A model for predicting the spatial MC below and above the fiber saturation point was presented in [1,3].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of moisture-induced stresses in wood cross-sections determined with a time-dependent, plastic material model during long-time exposure

Pech,

Autengruber,

Lukacevic

et al. 2023

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In recent years, the use of timber as a building material in larger construction applications such as multi-story buildings and bridges has increased. This requires a better understanding of the material to realize such constructions and design them more economically. However, accurate computational simulations of timber structures are challenging due to the complexity and inhomogeneity of this naturally grown material. It exhibits growth inhomogeneities such as knots and fiber deviations, orthotropic material behavior and moisture dependence of almost all physical parameters. Describing the creep response of wood under real climate conditions is particularly difficult. Changes in moisture content, plasticity and viscoelasticity affect moisture-induced stresses and potentially lead to cracks and structural damage. In this paper, we apply a material model that combines time and moisture-dependent behavior with multisurface plasticity to simulate cross-sections of different dimensions over a 14-month climate period. Our findings indicate that considering this long-term behavior has a minor impact on moisture-induced stresses during the drying period. However, during the wetting period, a purely linear elastic description of the material behavior of wood significantly overestimates tensile stresses within the cross-section, resulting in unrealistic predictions of wetting-induced fracture. Therefore, simulations during wetting periods require a sophisticated rheological model to properly reproduce the stress field.

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“…However, as a hygroscopic material, wood is sensitive to water, fungi, insects, etc., which restrains its wider applications [4,5]. The variation in moisture content causes wood to swell and shrink in various degrees, resulting in deformation and cracking [6,7]. Among the effects of these various defects, cracking is the most notable, as it is related to the mechanical performance and decay resistance of wood, raising safety concerns.…”

Section: Introductionmentioning

confidence: 99%

In Situ Construction of Thermotropic Shape Memory Polymer in Wood for Enhancing Its Dimensional Stability

et al. 2022

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The extension of wood to a wider field has been restrained significantly due to its dimensional instability that arises from variation in moisture content, which in turn brings about the risk of cracking, warping or distortion. This work proposed a novel strategy to stabilize wood by means of the in situ construction of a thermotropic shape memory polymer (SMP) inside wood. The cross-linked copolymer network (PMP) with good shape memory behavior was first investigated based on the reaction of methyl methacrylate (MMA) and polyethylene glycol diacrylate (PEGDA) in a water/ethanol solution; then, the PMP was constructed inside wood via vacuum-pressure impregnation and in situ polymerization. The weight gain, volume increment and morphology observations clearly revealed that the PMP was mainly present in wood cell lumens, cell walls and pits. The presence of PMP significantly enhanced the dimensional stability of and reduced the cracks in wood. The desirable shape recovery abilities of PMP under heating-cooling cycles were considered to be the main reasons for wood dimensional stabilization, because it could counteract the internal stress or retard the shrinkage of cell walls once water was evaporated from the wood. This study provided a novel and reliable approach for wood modification.

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Finite-element-based prediction of moisture-induced crack patterns for cross sections of solid wood and glued laminated timber exposed to a realistic climate condition

Cited by 24 publications

References 32 publications

Computergestützte Modellierung von Feuchtetransportprozessen in Holzwerkstoffen

Computergestützte Modellierung von Feuchtetransportprozessen in Holzwerkstoffen

Evaluation of moisture-induced stresses in wood cross-sections determined with a time-dependent, plastic material model during long-time exposure

In Situ Construction of Thermotropic Shape Memory Polymer in Wood for Enhancing Its Dimensional Stability

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