通过改良伯格模型和离轴压缩试验方法分析木材的剪切蠕变特性

IF 3.1 2区 农林科学 Q1 FORESTRY Wood Science and Technology Pub Date : 2024-07-24 DOI:10.1007/s00226-024-01578-7
Kanon Shimazaki, Kosei Ando
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引用次数: 0

摘要

本研究采用了结合麦克斯韦和 Voigt-Kelvin 模型单元的流变 Burger 模型以及改进的力学模型来分析木材的剪切蠕变机制。对日本桧柏(Chamaecyparis obtusa)试样进行了离轴压缩试验,并对剪切蠕变机制进行了力学分析。首先,测量到的蠕变顺应性曲线[JTL(t)]使用伯格模型进行拟合,该模型是用于解释木材蠕变行为的典型模型。此外,为了更准确地解释测量数据,还提出了三个具有非牛顿冲点的改进伯格模型:模型 1--只有永久应变单元中的冲点是非牛顿的;模型 2--两个冲点都是非牛顿的;模型 3--只有延迟弹性应变单元中的冲点是非牛顿的。模型 1 的判定系数平均值最高。在容许误差为 0.1% 的 50 个试样中,采用伯格模型拟合的试样数量为 43 个,采用模型 1 的试样数量为 45 个,采用模型 2 的试样数量为 25 个,采用模型 3 的试样数量为 45 个。伯格模型的理论值与测量值之间存在较大差异,模型 2 无法解释几个试样,模型 3 显示出与定义不一致的延迟弹性应变行为。因此,我们认为模型 1 最适合用于研究木材的剪切蠕变行为。
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Analysis of shear creep properties of wood via modified Burger models and off-axis compression test method

In this study, the rheological Burger model combining Maxwell and Voigt–Kelvin model units as well as modified mechanical models were employed to analyze the shear creep mechanism of wood. Off-axis compression tests were conducted on Japanese Hinoki cypress specimens (Chamaecyparis obtusa), and a mechanical analysis of the shear creep mechanism was performed. First, the measured creep compliance curves [JTL(t)] were fitted using this Burger model, which is a typical model used to explain the creep behavior of wood. Furthermore, three modified Burger models with non-Newtonian dashpots were proposed to explain the measured data more accurately: model 1—only the dashpot in the permanent strain unit is non-Newtonian; model 2—both dashpots are non-Newtonian; and model 3—only the dashpot in the delayed elastic strain unit is non-Newtonian. The mean value of the coefficient of determination was highest for model 1. The number of specimens that could be fitted with a tolerance error of 0.1% was 43 out of 50 with the Burger model, 45 with model 1, 25 with model 2, and 45 with model 3. The Burger model exhibited large discrepancies between the theoretical and measured values, model 2 could not be used to explain several specimens, and model 3 exhibited a delayed elastic strain behavior that was inconsistent with the definition. Therefore, we conclude that model 1 is the most appropriate for studying the shear creep behavior of wood.

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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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