A three-dimensional numerical analysis of moisture flow in wood and of the wood’s hygro-mechanical and visco-elastic behaviour

Florisson, Sara; Vessby, Johan; Ormarsson, Sigurdur

doi:10.1007/s00226-021-01291-9

Cited by 11 publications

(4 citation statements)

References 30 publications

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“…Clay and wood are the most popular materials that motivated these works, due to the difficulty in avoiding mechanical defaults during drying. Nowadays, 3D modeling has become quite common [29,23].…”

Section: Timementioning

confidence: 99%

State-of-the-art in the mechanistic modeling of the drying of solids: A review of 40 years of progress and perspectives

et al. 2023

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This review paper was written on the occasion of the 40 th anniversary of the Drying Technology Journal. Interestingly, most of the progress made in the domain of drying modeling and simulation has occurred over the last 40 years. Indeed, 40 years ago, the comprehensive formulation of coupled heat and mass transfer in porous media was available, however its potential use for computational simulation was only in its nascent stage. This is therefore an ideal time span in which to take a full historical context, to present the state-of-the-art and to give insights into its future trajectory. All aspects are deliberately presented in a pedagogical manner with many illustrations to make the text accessible to young scientists. However, for the benefit of experts, detailed formulations are provided in the annexes. The main points addressed in this work include:• The description of the comprehensive macroscopic formulation,• An historical perspective of the progress made in computational simulation,• The contribution of modeling in parameter characterization,• The mechanical aspects of drying: strain and stress induced by drying, including the case of large deformations,• The impact of non-local equilibrium,• The promising domain of the digital twin in parameter tuning and control/command.

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Section: Timementioning

confidence: 99%

State-of-the-art in the mechanistic modeling of the drying of solids: A review of 40 years of progress and perspectives

et al. 2023

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“…Both material parameters were assumed to be dependent on oven-dry density, 0 , moisture content, w , and temperature, T (Avramidis and Siau 1987;Sehlstedt-Persson 2001;Yeo et al 2008). The coefficients D w , D T , s w and s T were determined on the basis of experimental data previously collected by Florisson et al (2021) for different types of pine spp. from for example Avramidis and Siau (1987), Rosenkilde (2002) and Yeo et al (2008).…”

Section: Materials Parametersmentioning

confidence: 99%

Macroscopic X-ray computed tomography aided numerical modelling of moisture flow in sawn timber

et al. 2022

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Mathematical models are essential for the development of schedules for the air-circulation drying of timber in Swedish sawmills, but earlier models have been shown to be conservative leading to longer drying times than necessary. In the current study, macroscopic (macro) X-ray computed tomography (CT) has been used in both the development and validation of a finite element (FE) model, to enable the macro-CT aided FE modelling of the nonlinear transient moisture flow in wood. The model uses more advanced theory than has previously been used in Swedish sawmills, by incorporating a surface emission coefficient to simulate the surface resistance to moisture flow. A single piece of Norway spruce [Picea abies (L.) Karst.] timber was subjected to that part of a traditional kiln-drying schedule, which is associated with diffusion-driven moisture transport. The incorporation of macro-CT data into the FE model resulted in a more realistic representation of the board’s geometry, the initial moisture state, and the definition of material parameters. It also led to a better simulation of flow speed and moisture gradient, especially the asymmetric MC development within the cross section throughout the drying process.

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“…Their production is part of a growing trend in the construction industry [1][2][3][4][5]. The eco-friendly properties of wood as a building material and its structural properties have made CLT a promising material for sustainable buildings [6,7]. This happens because the wood for CLT is renewable and has a considerably lower carbon footprint than concrete [6,8].…”

Section: Introductionmentioning

confidence: 99%

Evaluating Laboratory Measurements for Sound Insulation of Cross-Laminated Timber (CLT) Floors: Configurations in Lightweight Buildings

2022

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Cross-laminated timber (CLT) floors with supplementary layers or floating floors comprise a common solution in new multistory timber structures. However, bare CLT components provide poor sound insulation, especially in low frequencies during structure-borne sound propagation. Thus, floor configurations in wooden buildings deploy more layers for improved acoustic behavior. Twelve contemporary CLT floors were analyzed after laboratory measurements of airborne sound reduction and impact sound transmission utilizing the following indicators: Rw, Rw, 100, Rw, 50, Ln,w, Ln,w,100, and Ln,w,50 (per ISO 10140, ISO 717). An increase in sound insulation was achieved thanks to added total mass and thickness, testing layers of the following: elastic mat for vibration isolation, wool insulation, gypsum boards, plywood, concrete screed, and wooden parquet floor. The results indicate that multilayered CLT floors can provide improvements of up to 22 dB for airborne sound and 32 dB for impact sound indicators compared with the bare CLT slab. Floating floor configurations with dry floor solutions (concrete screed) and wooden parquet floors stand out as the optimal cases. The parquet floor provides a 1–2 dB improvement only for impact sound indicators in floating floor setups (or higher in three cases).

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A three-dimensional numerical analysis of moisture flow in wood and of the wood’s hygro-mechanical and visco-elastic behaviour

Cited by 11 publications

References 30 publications

State-of-the-art in the mechanistic modeling of the drying of solids: A review of 40 years of progress and perspectives

State-of-the-art in the mechanistic modeling of the drying of solids: A review of 40 years of progress and perspectives

Macroscopic X-ray computed tomography aided numerical modelling of moisture flow in sawn timber

Evaluating Laboratory Measurements for Sound Insulation of Cross-Laminated Timber (CLT) Floors: Configurations in Lightweight Buildings

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