Effects of humidity on shear behavior of bamboo

Askarinejad, Sina; Kotowski, Peter; Shalchy, Faezeh; Rahbar, Nima

doi:10.1016/j.taml.2015.11.007

Cited by 71 publications

(22 citation statements)

References 33 publications

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“…For hundreds years [7], bamboo has enjoyed a vast and varied range of applications thanks to its structure that is functionally graded and naturally optimised to obtain a 'smart' variation in properties across its stem [8]. As shown in Figure 1, such variation is accomplished by the presence of non-uniformly distributed longitudinal fibres, with higher density at the outer wall [7]. This makes the outer surface stronger than the inner surface and results in a remarkable performance concerning stiffness and strength properties.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 Bamboo hierarchical structure. A composition of optical, SEM and AFM images from [7,10,15,16] As far as the mechanical properties are concerned, contrasting behaviour can be found within a bamboo culm. Indeed, individual bamboo's fibres may reach a strength of up to ~900MPa, whilst the matrix can only resist stresses 12 times lower (~50MPa).…”

Section: Introductionmentioning

confidence: 99%

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Multiscale analysis of bamboo deformation mechanisms following NaOH treatment using X-ray and correlative microscopy

et al. 2018

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Alkaline solutions are often employed for the treatment of bamboo in order to alter its natural elastic behaviour. In this work we study the effect of alkaline solutions on the elastic properties of bamboo. Using state of the art experimental techniques allowed shedding light on the deformation mechanisms occurring in the bamboo main constituents, i.e. fibres and matrix (parenchyma cells). Enhancement of fibre stiffness was experienced when up to 20% NaOH solution was employed, while for higher concentration a decay was observed. This effect was imputed to the modification of adhesion between fibrils induced by disruption of ligand elements (e.g. lignin). Modification of the matrix toughness was also experienced, that indicated an improved resistance to cracking when the concentration of NaOH is 25%, while reduction of toughness was revealed for lower concentrations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiscale analysis of bamboo deformation mechanisms following NaOH treatment using X-ray and correlative microscopy

et al. 2018

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“…Bamboo woods are used to fabricate structural elements and also as an alternative to steel in reinforced concrete [2]. specifying the mechanical performance of full-sized bamboo structural members, when subjected to extreme heat loads, is a difficult task because of the high cost and complexity of the material and high cost testing methods, for example thermomechanical testing of bamboo sample is required to determine its mechanical characteristics at high temperature, which is usually assesses the safety of structural members exposed to fire, it can be noticed that the chemical composition and properties are changed during such these tests due to temperature and other environmental effects which is finally affect the mechanical properties of the bamboo wood composites [3].…”

Section: Bamboo Woodmentioning

confidence: 99%

Effects of Chemical and Physical Changes Caused by Temperature and Grain Size on Mechanical Behavior of Composite Materials (Case-Study, Bamboo Wood)

Almutairi¹,

Tjprc²

2018

IJCPT

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This paper studying and analyze the effects of changing the chemical and physical properties on the mechanical behavior of composite parts composing such materials especially composites woods like bamboo wood. Any chemical or physical change of the elements composing any composite material will lead to a change in its mechanical properties and so a new application of such materials will be created. The modulus of indentation (E IT ), the elastic index (η IT ), also the Hardness index (Martens index) (H M ) and the creep factor of indentation (C IT ) are evaluated due to the change in chemical or physical values.

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“…The investigation about shrinkage of bamboo is not well documented in the literature. Even though finite element method (FEM) has been widely applied in the investigation of macro-structural behavior of bamboo culms [ 29 , 30 , 31 , 32 , 33 , 34 , 35 ], its use to analyze crack growth emanating from climatic variations in such material remains unavailable to this date. Few studies have used the heat transfer analysis in FEM to analyze the effect of change in MC given the similarity which prevails between heat transfer and moisture transfer [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Underlying Effect of Thermal Modification on Shrinkage Behavior of Bamboo Culm by Experimental and Numerical Methods

et al. 2021

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This study probes into the root cause of split in thermally modified bamboo culm by investigating the underlying effect of thermal contraction with respect to its orthotropic nature by experimental and numerical methods while concurrently monitoring the chemical variation of its structure by Fourier transformed infrared spectroscopy (FTIR). In first part of this study, a non-linear increase in dimensional and weight changes of small clear bamboo specimens were observed with increasing temperature. The dimensional changes in the radial and tangential directions significantly exceeded that in the longitudinal direction. From FTIR results, shrinkage effect between 150 °C to 200 °C was associated with weight loss engendered by reduction in weakly bound water and increase in desorption of water content while alteration of its mechanical properties was attributed to changes in cellulose, hemicellulose, and lignin. From results of finite element method (FEM), the graded variation in thermal expansion coefficient, which showed the formation of a narrowed region of strain concentration corresponding to longitudinal crack propagation, was associated with the inducement of internal forces, namely tensile and compressive forces, at specific regions along the culm length. The results of this study can be useful to achieve optimized durability in modified bamboo for construction.

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Effects of humidity on shear behavior of bamboo

Cited by 71 publications

References 33 publications

Multiscale analysis of bamboo deformation mechanisms following NaOH treatment using X-ray and correlative microscopy

Multiscale analysis of bamboo deformation mechanisms following NaOH treatment using X-ray and correlative microscopy

Effects of Chemical and Physical Changes Caused by Temperature and Grain Size on Mechanical Behavior of Composite Materials (Case-Study, Bamboo Wood)

Investigating the Underlying Effect of Thermal Modification on Shrinkage Behavior of Bamboo Culm by Experimental and Numerical Methods

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