Viscoelastic behavior of softwood based on a multiscale computational homogenization

Bengtsson, Rhodel; Mousavi, Seyed Mahmoud; Afshar, R.; Gamstedt, E. Kristofer

doi:10.1016/j.mechmat.2023.104586

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…The creep compliance tended to increase logarithmically with time and then gradually plateaued. This trend was similar to previous reports on shear creep of wood (Hayashi et al 1993;Ando et al 2023;Bengtsson et al 2023).…”

Section: Transition Of Creep Strain and Creep Compliancesupporting

confidence: 92%

“…Although several studies (Holzer et al 1989;Navi and Stanzl-Tschegg 2009) have been conducted on the viscoelasticity of wood, few studies have been conducted on long-term shear loading (Norimoto et al 1965;Schniewind and Barrett 1972;Vermaas 1989;Hayashi et al 1993; Hong and Arima 1998;Ando et al 2005;Entwistle 2005;Vincent et al 2006 ; Fan and Enjily 2009;Ohashi et al 2009;Ogawa and Kobayashi 2020;Allemand et al 2021;Akter et al 2022;Ando et al 2023;Bengtsson et al 2023). Entwistle (2005) considered the changes in shear strain during wood creep in terms of the shear forces along the direction of microfibrils in the S2 layer, shear force between microfibrils and the hemicellulose, and adsorption/desorption of water molecules within the hemicellulose.…”

Section: Shear Creep Properties Of Woodmentioning

confidence: 99%

“…Most studies conducted to date on the shear creep of wood have been limited to measuring the creep strain or compliance trends and estimating the influence of microstructural factors, with no direct reference to its mechanics. Bengtsson et al (2023) used the Voigt-Kelvin model to study the mechanism of shear creep in three orthogonal sections of Norway spruce, but it can be pointed out that the model did not take a permanent strain into account. To overcome this limitation, in this study, the Burger model combining the Maxwell and Voight-Kelvin model units as well as modified mechanical models were used to analyze the shear creep mechanism of wood.…”

Section: Shear Creep Properties Of Woodmentioning

confidence: 99%

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Analysis of shear creep properties of wood via modified Burger models and the off-axis compression test method

Shimazaki,

Ando

2024

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In this study, the Burger model combining the Maxwell and Voight–Kelvin model units as well as modified mechanical models were employed to analyze the shear creep mechanism of wood. Off-axis compression tests were conducted on Japanese cypress specimens, and a mechanical analysis of the shear creep mechanism was performed. First, the measured creep compliance curves [JTL(t)] were fitted using the Burger model, which is a typical model that explains the creep behavior of wood. Furthermore, three modified Burger models with non-Newtonian dashpots were proposed to explain the measured data more accurately: model 1 — only the dashpot in the permanent strain unit is non-Newtonian; model 2 — both dashpots are non-Newtonian; and model 3 — only the dashpot in the delayed elastic strain unit is non-Newtonian. The results showed that the average values of the coefficients of determination of the Burger model and models 1, 2, and 3 were 0.940±0.061, 0.979±0.034, 0.978±0.024, and 0.889±0.132, respectively. The number of specimens that could be fitted with a tolerance error of 0.1% was 43 out of 50 with the Burger model, 45 with model 1, 25 with model 2, and 45 with model 3. However, the Burger model exhibited large discrepancies between the theoretical and measured values, model 2 could not be used to explain several specimens, and model 3 exhibited a delayed elastic strain behavior that was inconsistent with the definition. Therefore, we conclude that model 1 is the most appropriate for studying the shear creep behavior of wood.

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Section: Transition Of Creep Strain and Creep Compliancesupporting

confidence: 92%