Utjecaj sadržaja vode u drvu na strukturnu cjelovitost drva pri dinamičkim opterećenjima

IF 0.7 4区 农林科学 Q4 MATERIALS SCIENCE, PAPER & WOOD Drvna Industrija Pub Date : 2023-06-20 DOI:10.5552/drvind.2023.0067
Lukas Emmerich, Christian Brischke
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Abstract

The majority of mechanical wood properties are negatively affected by wood moisture within the hygroscopic range, disregarding the stress relaxation of wood at very low moisture contents (MC). In contrast, the structural integrity and thus the brittleness of wood appears to be positively affected by moisture. This study aimed at examining the effect of wood MC on the structural integrity of wood between the oven-dry state and MC well above cell wall saturation (CWS), i.e., at approx. 100 %. For both softwood (Picea abies) and hardwoods (Fagus sylvatica and Quercus robur), the structural integrity was assessed on the basis of the Resistance to Impact Milling (RIM) originating from High-Energy Multiple Impact (HEMI) tests. RIM increased with increasing MC in the hygroscopic range, which might be explained by stress relaxation and ‘gluing effects’ inside the cell wall polymer structure, resulting from a growing network of hydrogen bonds on cell wall level. Increasing MC above CWS caused a slight decrease of RIM in the selected hardwood species, whereas no significant change in RIM was observed when MC varied in the range from CWS to approx. 100 % for the softwood species Norway spruce.
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树木含水量对动态荷载下树木结构完整性的影响
在吸湿范围内,木材的大多数机械性能都受到木材水分的负面影响,而忽略了木材在极低含水率(MC)下的应力松弛。相反,木材的结构完整性和脆性似乎受到水分的积极影响。本研究旨在研究木材MC对木材结构完整性的影响,在烘干状态和远高于细胞壁饱和(CWS)的MC之间,即大约。100%。对于软木(Picea abies)和硬木(Fagus sylvatica和Quercus robur),基于高能多次冲击(HEMI)测试产生的抗冲击铣削(RIM)来评估结构完整性。在吸湿范围内,RIM随着MC的增加而增加,这可能是细胞壁聚合物结构内部的应力松弛和“胶合效应”造成的,这是由于细胞壁水平上氢键网络的增长造成的。在CWS以上增加MC会导致所选阔叶树的RIM略有下降,而在CWS至约范围内,MC变化不显著。软木种挪威云杉的比例为100%。
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来源期刊
Drvna Industrija
Drvna Industrija MATERIALS SCIENCE, PAPER & WOOD-
CiteScore
1.80
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: "Drvna industrija" ("Wood Industry") journal publishes original scientific and review papers, short notes, professional papers, conference papers, reports, professional information, bibliographical and survey articles and general notes relating to the forestry exploitation, biology, chemistry, physics and technology of wood, pulp and paper and wood components, including production, management and marketing aspects in the woodworking industry.
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