The variation of tangential rheological properties caused by shrinkage anisotropy and moisture content gradient in white birch disks

Fu, Zhihao; Zhao, Jun; Huan, Siqi; Xiao-min, Sun; Cai, Yingchun

doi:10.1515/hf-2014-0089

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…The uneven distribution of wood moisture will produce moisture gradient stress, which forms an additional source of drying stresses in wood. Therefore, the shrinkage anisotropy stress and moisture gradient stress, are the two principal catalysts of drying stresses in wood [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Review on Wood Deformation and Cracking during Moisture Loss

Chen

Zhang

et al. 2023

Polymers

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Wood, being a natural hygroscopic material, the interaction between wood and moisture plays a crucial role in wood processing and utilization. Moisture affects the physical and mechanical properties of wood, and is also one of the main external factors that cause wood deformation and cracking. Drying shrinkage is a common phenomenon during the processing and utilization of wood induced by moisture loss. Drying stress is the main cause of wood deformation and cracking. The shrinkage differential between tangential and radial direction and moisture content gradient of wood are two reasons induced the generation of drying stresses. In this review, the existing states of moisture in wood and the interaction between water molecules and wood components were systematically summarized. The current research progress and deficiencies in three aspects including the factors resulted in deformation and cracking in wood caused by moisture loss, the correlation between wood mechanical properties and moisture, as well as the development of deformation and cracking in wood under moisture loss were discussed. This review aims to facilitate further research on the deformation and cracking of wood under moisture loss by providing valuable insights and assistance, ultimately reducing the occurrence of wood deformation and cracking. And thus, it will enhance the overall utilization of wood resources, making wood better serve human life.

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Section: Introductionmentioning

confidence: 99%

Review on Wood Deformation and Cracking during Moisture Loss

Chen

Zhang

et al. 2023

Polymers

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“…Fu et al compared the development and distribution of the drying strain of Betula platyphylla Suk. under the sole effect of the shrinkage anisotropy and the joint effect of shrinkage anisotropy and moisture gradient [50]. The results indicate that when there was an MC gradient and the MC was lower than 26%, the actual shrinkage strain became lower, the viscoelastic creep strain was more easily recovered and diverted and the mechano-sorptive creep strain was significantly reduced, while cracks and delamination became worse.…”

Section: The Generation and Development Mechanism Of Wood Drying Stressmentioning

confidence: 94%

Drying Stress and Strain of Wood: A Review

Yin

Liu

2021

Applied Sciences

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Wood drying stress causes various drying defects, which result from the wood microstructure and the transfer of heat and mass during the drying. It is the fundamental way to solve the problem of defects to clarify the law and mechanism of wood stress and strain development during drying. In this paper, based on the defects of wood drying, the theory and experimental testing methods of drying stress and strain were summarized. Meanwhile, artificial neural networks (ANN) and their application in the wood drying field were also investigated. The traditional prong and slicing methods were used practically in the research and industry of wood drying, but the stress changes in-process cannot be trapped. The technologies of image analysis and near-infrared spectroscopy provide a new opportunity for the detection of drying stress and strain. Hence, future interest should be attached to the combination of the theory of heat and mass transfer and their coupling during drying with the theory of microscopic cell wall mechanics and macroscopic drying. A more complete image acquisition and analysis system should be developed to realize the real-time monitoring of drying strain and cracking, practically. A more feasible and reasonable prediction model of wood drying stress and strain should be established to achieve the accuracy of the prediction.

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“…MC i and MC t were determined from initial weight and oven-dry weight which was gotten by placing specimens in a DHG-9070A drying oven (Shanghai Scientific Instruments Yiheng Co., Ltd., Shanghai, China) at a temperature of 103 ± 2°C until a constant weight. The drying strains, which included shrinkage strain and mechano-sorptive creep, were determined by image analysis method (Fu et al 2015, Fu et al 2016a, it is a noncontact method based on the distance between two dots. A digital camera (1628 × 1236 resolution) was fixed to a tripod, and kept 200 mm from the wood disc under evaluation.…”

Section: Determination Of MC and Drying Strainsmentioning

confidence: 99%

Effects of saturated vapor pre-steaming on drying strain in Asian White Birch: Experimentation and modelling

Avramidis

Zhao

et al. 2019

Maderas, Cienc. tecnol.

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The effect of low pressure saturated vapor pre-steaming on restrained shrinkage strain, mechanosorptive creep and the distribution of moisture content was investigated during conventional drying of wood discs. Mechano-sorptive creep was furthermore modelled by artificial neural network theory with five inputs, i.e., pre-steaming and drying temperatures, wood moisture content, relative humidity and distance from the pith. Results revealed that, pre-steaming partly reduced the variation of moisture content distribution along radial direction, increased restrained shrinkage strain in heartwood and decreased in sapwood and slightly decreased the mechano-sorptive creep. The neural network model provided reasonable prediction results, namely, the coefficient of determination for training, validation and test sets greater than 0,95.

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The variation of tangential rheological properties caused by shrinkage anisotropy and moisture content gradient in white birch disks

Cited by 11 publications

References 16 publications

Review on Wood Deformation and Cracking during Moisture Loss

Review on Wood Deformation and Cracking during Moisture Loss

Drying Stress and Strain of Wood: A Review

Effects of saturated vapor pre-steaming on drying strain in Asian White Birch: Experimentation and modelling

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