从屈服应力角度阐释木材夹层压缩的机理

IF 2.2 3区 农林科学 Q2 FORESTRY Holzforschung Pub Date : 2023-06-16 DOI:10.1515/hf-2023-0002
Rongfeng Huang, S. Feng, Zhiqiang Gao, H. Liu
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引用次数: 0

摘要

摘要为了阐明木材夹层压缩的机理,本研究研究了木材压缩屈服应力对湿热条件下预热温度的响应(30–210 °C)和含水量(MC,0-100 %). 基于测量的木材中的MC和温度,开发了一个相关的函数模型来预测木材的屈服应力。A 1 % 木材MC或10的增加 温度升高°C导致木材屈服应力降低超过0.1 MPa。屈服应力的显著变化,超过0.8 当MC变化超过5 %. 用加热板预热木材会加速木材中的水分迁移,导致水分迁移的木材内部区域的屈服应力相对较低。这项研究表明,一些木材区域相对较低的屈服应力是夹层压缩的原因。当机械压缩时,无论机械力是切向还是径向施加,只有屈服应力较低的木材层被压缩,导致夹层压缩。
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Mechanism elucidation for wood sandwich compression from the perspective of yield stress
Abstract To elucidate the mechanism of wood sandwich compression, the response of wood compressing yield stress to hygrothermal conditions was investigated in this study with respect to preheating temperature (30–210 °C) and moisture content (MC, 0–100 %). An associated functional model was developed to predict wood yield stress based on the measured MC and temperature in wood. A 1 % increase in wood MC or a 10 °C increase of temperature led to a decrease in wood yield stress exceeding 0.1 MPa. Significant variations in yield stress, exceeding 0.8 MPa, were observed between high MC layer(s) and the remaining layer(s) along the wood thickness when there was an MC variation over 5 %. Preheating the wood with by heating platens accelerated water/moisture migration in wood, resulting in relatively low yield stress in the wood interior areas where water/moisture had migrated. This study demonstrated that the comparatively low yield stress of some wood areas was responsible for sandwich compression. When mechanically compressed, only the wood layer(s) with lower yield stress was compressed, leading to sandwich compression, regardless of whether the mechanical force was applied tangentially or radially.
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来源期刊
Holzforschung
Holzforschung 工程技术-材料科学:纸与木材
CiteScore
4.60
自引率
4.20%
发文量
83
审稿时长
3.3 months
期刊介绍: Holzforschung is an international scholarly journal that publishes cutting-edge research on the biology, chemistry, physics and technology of wood and wood components. High quality papers about biotechnology and tree genetics are also welcome. Rated year after year as one of the top scientific journals in the category of Pulp and Paper (ISI Journal Citation Index), Holzforschung represents innovative, high quality basic and applied research. The German title reflects the journal''s origins in a long scientific tradition, but all articles are published in English to stimulate and promote cooperation between experts all over the world. Ahead-of-print publishing ensures fastest possible knowledge transfer.
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