Swelling and shrinking behaviour of bamboo and its application on a hygro-mechanical model

IF 3.1 2区 农林科学 Q1 FORESTRY
Leo Maia do Amaral, Luisa Molari, Holmer Savastano Jr.
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Abstract

Bamboo exposed to variations in humidity is prone to cracking, which can reduce its usability. As a natural material, bamboo’s hygroscopicity causes dimensional changes, influenced by the gradient distribution of fibres throughout the wall thickness. This study evaluated the dimensional changes resulting from variations in moisture content. Hygroscopic coefficients were extracted and applied in a finite element model to assess the circumferential stresses generated during sorption and desorption processes. Conditioning tests showed that open ring samples tend to close during sorption and open during desorption, due to the predominant swelling and shrinking behaviour of the fibre cells. The developed finite element model successfully replicated the aperture behaviour and dimensional changes in the thickness of open ring bamboo samples. The optimized parameters were subsequently used to predict the stresses under varying humidity conditions in closed-ring samples The circumferential stresses ranged from 9.8 MPa to -12.5 MPa from the inner to the outer layer in the saturated condition, and from − 7.1 MPa to 11.4 MPa in the dried condition. The values achieved reflect stresses that can lead to cracks and the failure of bamboo, thereby demonstrating the model’s ability to predict the hygroscopic behaviour of the material.

Abstract Image

竹的胀缩特性及其在水力学模型上的应用
竹子暴露在湿度变化中容易开裂,从而降低其可用性。作为一种天然材料,竹子的吸湿性引起尺寸变化,受纤维在整个壁厚上的梯度分布的影响。本研究评估了因含水量变化而引起的尺寸变化。提取吸湿系数并将其应用于有限元模型中,以评估吸附和解吸过程中产生的周向应力。调节试验表明,由于纤维细胞的主要膨胀和收缩行为,开环样品在吸附过程中趋于关闭,在解吸过程中趋于打开。所建立的有限元模型成功地模拟了开环竹样品的孔径行为和厚度的尺寸变化。利用优化后的参数对不同湿度条件下封闭环样品的应力进行了预测。在饱和条件下,环向应力从内层到外层的范围为9.8 ~ -12.5 MPa,在干燥条件下,环向应力范围为−7.1 ~ 11.4 MPa。所获得的数值反映了可能导致竹子开裂和破坏的应力,从而证明了该模型预测材料吸湿性行为的能力。
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来源期刊
Wood Science and Technology
Wood Science and Technology 工程技术-材料科学:纸与木材
CiteScore
5.90
自引率
5.90%
发文量
75
审稿时长
3 months
期刊介绍: Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.
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