纤维素纤维交联对不同尺度木材机械行为的影响

IF 3.1 2区 农林科学 Q1 FORESTRY Wood Science and Technology Pub Date : 2024-07-26 DOI:10.1007/s00226-024-01569-8
Nhat-Tung Phan, François Auslender, Joseph Gril, Rostand Moutou Pitti
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引用次数: 0

摘要

预测结构参数对木材弹性的影响对工程应用非常有用,但由于多种尺度的复杂交错,了解哪些特征需要考虑是非常重要的。这项工作的目的是研究纤维素纤维的波浪状和相互连接对木材刚度的影响,微观力学模型通常会忽略这一观察到的特征。为此,我们开发了一个估算木材宏观行为的多尺度模型。该模型整合了三种不同尺度的木材结构:细胞壁、细胞组织和生长环。它依靠数值和分析均质化程序,通过在每个尺度上定义一个周期性代表体积元素来确定它们的有效行为。通过使用这种多尺度模型,可以看出纤维的振荡和相互连接对宏观层面(环尺度)的某些模量(如宏观剪切模量)有显著影响,而对其他模量则可以忽略不计。此外,虽然纤维交联对细胞壁层面弹性行为的某些成分有相当大的影响,但在宏观层面却失去了其重要性,尤其是对低密度木材而言。这种趋势可以用相邻细胞壁中纤维的反对称倾斜来解释。另一方面,对于密度较大的木材,相邻细胞壁之间的相互作用不那么主要,或者对于软化木材,纤维振荡的影响仍然很重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Effects of cellulose fibril cross-linking on the mechanical behavior of wood at different scales

Predicting the influence of structural parameters on wood elasticity is useful for engineering application, however due to the complex imbrication of several scales it is important to know which features need to be taken into account. The aim of this work is to investigate the influence on wood stiffness of waviness and interconnection of cellulosic fibrils, an observed feature usually overlooked in micromechanical models. For that, a multi-scale model estimating the macroscopic behavior of wood is developed. This model integrates three different scales of wood structure: that of the cell wall, that of the cellular tissue and that of the growth ring. It relies on both numerical and analytical homogenization procedures to determine their effective behavior by defining at each scale a periodic representative volume element. Using this multi-scale model, it is shown that the influence of the oscillations and interconnections of the fibrils is significant for certain moduli at the macroscopic level (ring scale), such as the macroscopic shear moduli, while it can be neglected for others. Furthermore, although the effect of fibril crosslinks is quite strong for certain components of elastic behavior at the cell wall level, it loses its importance at the macroscopic level, especially for low-density wood. This trend can be explained by the anti-symmetric tilt of fibrils in adjacent cell walls. On the other hand, for denser woods where the interactions between adjacent cell walls are less dominant, or in the case of softened wood, the effect of fibril oscillations remains important.

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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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