Experimental study of the mechanical behaviour of thin slices of maturating green poplar wood using cyclic tensile tests

Pot, Guillaume; Coutand, Catherine; Cam, Jean‐Benoît Le; Toussaint, Evelyne

doi:10.1007/s00226-012-0477-8

Cited by 4 publications

(5 citation statements)

References 18 publications

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“…In this study, it is assumed that all cells have the same viscoelastic properties once they are matured. This approximation is consistent with the results of Pot et al (2013a). In addition, negligible differences were found by Pot et al (2013b) between the viscoelastic behaviour of OW and that of TW.…”

Section: Mechanical Propertiessupporting

confidence: 91%

A model to simulate the gravitropic response and internal stresses in trees, considering the progressive maturation of wood

Pot¹,

Coutand²,

Toussaint³

et al. 2014

Trees

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purpose, the curvature during righting movement, the geometry and the mass distribution of a two-year-old poplar tree were measured. The identified MS are higher than expected, which shows the underestimation of MS by usual measurements. By using the same mechanical parameters and MS as an input, the model gives satisfying results in terms of shape modelling for different trees up to 32 days after tree tilting. The model is able to simulate the latency phase observed in the tree righting movement, and the internal stress profile in the trunk is realistic (low compressive value in the central part of the trunk and zero stress in newly-formed cells). The next development of the model will aim to simulate the end of the gravitropic phase in relation with the regulation of MS by the tree. M. Saudreau participated to the optimization procedure for the identification of the parameters of the model.

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Section: Mechanical Propertiessupporting

confidence: 91%

A model to simulate the gravitropic response and internal stresses in trees, considering the progressive maturation of wood

Pot¹,

Coutand²,

Toussaint³

et al. 2014

Trees

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“…This stress profile can explain the difference in sign for the autonomous curvature of the slats. In a previous study [23], it was showed that infradensity increases until a distance of about 1.5 mm from the cambium; thus the cells are not fully matured until at least this distance, which corresponds to the thickness of the samples used in this study. This is consistent with the explanation proposed here to interpret the different directions of autonomous curvature.…”

Section: Resultsmentioning

confidence: 87%

“…E 0 mainly increases with wood-cell age for OW samples, but no clear evolution for TW samples appears. However, the measurement of the elastic modulus was not the objective of this study, and it can be measured by other means [22,23]. Except for E 0 , the variations in viscoelastic parameters with respect to wood-cell age appear very similar between OW and TW samples.…”

Section: Creep Tests Resultsmentioning

confidence: 96%

Experimental study of the viscoelastic properties of green poplar wood during maturation

et al. 2013

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During the radial growth of trees, internal stresses are created because of wood-cell maturation. Biomechanical models can compute these stresses, but they are currently limited by a lack of knowledge about the viscoelastic behavior of green wood. The aim of the present paper is to study the viscoelastic behavior of green wood and to obtain measurements of viscoelastic parameters. In order to accomplish this, the effect of internal maturation stresses on the studied samples was first eliminated by studying viscoelastic phenomena. Creep tests were then performed on small slats of wood using a cantilever bending test. It is shown that green wood viscoelastic behavior can be modeled with Burgers' model. The corresponding parameters are estimated with respect to the wood-cells age. No significant difference between tension wood and normal wood is revealed, but it appears that green wood tends to lose its viscoelastic behavior with maturation

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“…As reported by Thibaut et al (2001), the tendency of the material to deform in response to physico-chemical changes can result in stress of high magnitude only if the cell wall is already sufficiently stiff. To the best of our knowledge, information on the stiffening kinetics of wood cell wall layers is currently lacking and the only measurements available are at the tissue scale (Grozdits and Ifju, 1969;Pot et al, 2013a;2013b).…”

Section: Introductionmentioning

confidence: 99%

Mechanical characterisation of the developing cell wall layers of tension wood fibres by Atomic Force Microscopy

Capron

Ramonda²,

Laurans³

et al. 2022

Peer Community Journal

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Trees generate mechanical stresses at periphery of stem and branches to improve their strength and to control the orientation of their axes. This key factor in the biomechanical design of trees, named "maturation stress", occurs in wood fibres during cellular maturation when their secondary cell wall thickens. In this study, the spatial and temporal stiffening kinetics of the different cell wall layers were recorded during fibre maturation on a sample of poplar tension wood using atomic force microscopy. The thickening of the different layers was also recorded. The stiffening of the CML, S 1 and S 2 -layers was initially synchronous with the thickening of the S 2 -layer and continued a little after the S 2 -layer reached its final thickness as the G-layer began to develop. In contrast, the global stiffness of the G-layer, which initially increased with its thickening, was close to stable long before it reached its final maximum thickness. A limited radial gradient of stiffness was observed in the G-layer, but it decreased sharply on the lumen side, where the new sub-layers are deposited during cell wall thickening. Although very similar at the ultrastructural and biochemical levels, the stiffening kinetics of the poplar G-layer appears to be very different from that described in maturing bast fibres.

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Experimental study of the mechanical behaviour of thin slices of maturating green poplar wood using cyclic tensile tests

Cited by 4 publications

References 18 publications

A model to simulate the gravitropic response and internal stresses in trees, considering the progressive maturation of wood

A model to simulate the gravitropic response and internal stresses in trees, considering the progressive maturation of wood

Experimental study of the viscoelastic properties of green poplar wood during maturation

Mechanical characterisation of the developing cell wall layers of tension wood fibres by Atomic Force Microscopy

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