Prediction of moisture-induced cracks in wooden cross sections using finite element simulations

Brandstätter, Florian; Autengruber, Maximilian; Lukacevic, Markus; Füssl, Josef

doi:10.1007/s00226-023-01469-3

Cited by 5 publications

(2 citation statements)

References 46 publications

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“…In conclusion, it can be stated that crack predictions based on linear elastic simulations are conservative, but under dry conditions, they offer valuable insights for engineering comprehension [4]. Conversely, in cases of wetting conditions, it is essential to consider time-dependent and moisture-dependent material effects to attain realistic stress levels.…”

Section: Discussionmentioning

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

Preprint

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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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Section: Discussionmentioning

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

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…In conclusion, it can be stated that crack predictions based on models not accounting for viscoelasticity and mechanosorption are conservative, but under dry conditions, they offer valuable insights for engineering comprehension [34]. Conversely, in cases of wetting conditions, it is essential to consider time-dependent and moisture-dependent material effects to attain realistic stress levels.…”

mentioning

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. 2024

Buildings

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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, neglecting the time- and moisture-dependent material behavior of wood leads to a significant overestimation of 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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Numerical simulation of CLT moisture uptake and dry-out following water infiltration through end-grain surfaces

Brandstätter,

Kalbe,

Autengruber

et al. 2023

Journal of Building Engineering

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Prediction of moisture-induced cracks in wooden cross sections using finite element simulations

Cited by 5 publications

References 46 publications

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

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

Evaluation of Moisture-Induced Stresses in Wood Cross-Sections Determined with a Time-Dependent, Plastic Material Model during Long-Time Exposure

Numerical simulation of CLT moisture uptake and dry-out following water infiltration through end-grain surfaces

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