A model for multiphase moisture and heat transport below and above the saturation point of deformable and swelling wood fibers-II : Hygro-mechanical response

• A non-linear elastic constitutive model for a swelling/shrinking orthotropic wood matrix is proposed. Themodel is thermodynamically consistent, derived based on the principles of continuum mechanics and thehybrid mixture theory. Moisture induced strains are introduced considering finite deformations by assuming amultiplicative split of the deformation gradient tensor into a swelling and an elastic part. Novel definitions ofthe Cauchy stress tensor and the moisture-dependent elastic material tangent matrix are obtained. The modelis coupled to a multi-phase transient mass and heat transport model developed in Part I of this work. Inthis part of the work 2-D and 3-D test examples are used to describe the ability of the model to simulatemoisture-induced distortions when drying wood within the hygroscopic and also from the over-hygroscopicmoisture ranges. Despite deriving the model considering wood, the obtained constitutive relations can besuitably adopted to other orthotropic porous materials displaying properties similar to that of wood.

Ämnesord

LANTBRUKSVETENSKAPER  -- Lantbruksvetenskap, skogsbruk och fiske -- Trävetenskap (hsv//swe)

AGRICULTURAL SCIENCES  -- Agriculture, Forestry and Fisheries -- Wood Science (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Byggproduktion (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Construction Management (hsv//eng)

Nyckelord

Moisture transport

Hygro-mechanical

Finite strains

Wood drying

Evolving orthotropy

Non-linear elastic

Byggteknik

Civil engineering

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