Three-dimensional orthotropic nonlinear transient moisture simulation for wood: analysis on the effect of scanning curves and nonlinearity

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ID: 115734
2020
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Abstract
This paper introduces, with the development of user-subroutines in the finite-element software Abaqus FEA®, a new practical analysis tool to simulate transient nonlinear moisture transport in wood. The tool is used to revisit the calibration of moisture simulations prior to the simulation of mechanical behaviour in bending subjected to climate change. Often, this calibration does not receive sufficient attention, since the properties and mechanical behaviour are strongly moisture dependent. The calibration of the moisture transport simulation is made with the average volumetric mass data experimentally obtained on a paired specimen of Norway spruce (Picea abies) with the dimensions $$30\times 15\times 640\, {\mathrm{mm}}^{3}$$ 30 × 15 × 640 mm 3 . The data, from a 90-day period, were measured under a constant temperature of 60 °C and systematic relative humidity cycles between 40 and 80%. A practical method based on analytical expressions was used to incorporate hysteresis and scanning behaviour at the boundary surface. The simulation tool makes the single-Fickian model and Neumann boundary condition readily available and the simulations more flexible to different uses. It also allows for a smoother description of inhomogeneity of material. The analysis from the calibration showed that scanning curves associated with hysteresis cannot be neglected in the simulation. The nonlinearity of the analysis indicated that a coherent set of moisture dependent diffusion and surface emission coefficient is necessary for the correct description of moisture gradients and mass transport.
Reference Key
florisson2020woodthree-dimensional Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Sara Florisson;Johan Vessby;Winston Mmari;Sigurdur Ormarsson;Sara Florisson;Johan Vessby;Winston Mmari;Sigurdur Ormarsson;
Journal wood science and technology
Year 2020
DOI
doi:10.1007/s00226-020-01210-4
URL
https://link.springer.com/article/10.1007/s00226-020-01210-4
Keywords
manufacturing ceramics Machines Tools Processes glass composites natural materials wood science & technology

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