含水量对苏格兰松木心材和边材在撞击下行为的影响

IF 2.2 3区 农林科学 Q2 FORESTRY
Mojtaba Hassan Vand, Jan Tippner
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引用次数: 0

摘要

在不同的木材品种中,边材和心材的材料特性各不相同,甚至在同一棵树上也会表现出明显的差异。苏格兰松木(Pinus sylvestris L.)是一种在细木工和建筑施工用材生产中起着重要作用的树种,它的心材和边材之间也有明显的区别。为了研究含水率(MC)对松木边材和心材冲击行为的影响,我们测试了两种不同含水率的试样:含水率为 12% 的低含水率(LMC)组和含水率为 45% 的高含水率(HMC)组。在研究中,我们使用配备了高速相机和数字图像相关方法的冲击试验机,调查了试样在短时间冲击过程中的挠度、法向应变和力的发展情况,并计算了试样的冲击弯曲强度(IBS)。我们的结果表明,在最大挠度和法向应变方面,边材和心材在 LMC 值上的差异并不明显,因此没有区分的必要;然而,随着 MC 值的增加,这些差异变得更加明显,且不可忽略。我们还对心材和边材的 IBS 进行了评估,发现在 LMC 条件下,心材的冲击弯曲强度大于边材,因此心材更适合作为承受冲击载荷的材料。相反,在 HMC 条件下,心材和边材的抗冲击强度相同,这表明松树的绿色木材对树木中边材和心材的比例并不敏感。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of moisture content on the behaviour of Scots pine heartwood and sapwood under impact
The material properties of sapwood and heartwood vary within various wood species and even they can show significant differences within a single tree. Scots pine (Pinus sylvestris L.), a species that plays a crucial role in timber production for joinery and building construction applications, is among those that show a notable distinction between its heartwood and sapwood. To examine the influence of moisture content (MC) on the impact behaviour of the sapwood and heartwood of pine, we tested specimens with two distinct moisture levels: a low moisture content (LMC) group with 12% MC and a high moisture content (HMC) group with 45% MC. In our study, we investigated deflection, normal strain and force development of the specimens during the short period of an impact, and also calculated the impact bending strength (IBS) of samples, using an impact testing machine equipped with a high-speed camera and digital image correlation method. Our results indicate that the differences between sapwood and heartwood at LMC were insignificant in the case of maximum deflection and normal strain, thus there is no need for differentiation; however, these differences became more pronounced, and non-negligible, with an increase in MC. We also evaluated the IBS of both heartwood and sapwood and found that, at LMC, heartwood had greater impact bending strength than sapwood, making it a preferable choice as a material subjected to impact loadings. Conversely, at HMC, both heartwood and sapwood would be equally strong against impacts, indicating that pine green wood shows no sensitivity to the ratio of sapwood to heartwood in the tree.
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来源期刊
Journal of Wood Science
Journal of Wood Science 工程技术-材料科学:纸与木材
CiteScore
5.40
自引率
10.30%
发文量
57
审稿时长
6 months
期刊介绍: The Journal of Wood Science is the official journal of the Japan Wood Research Society. This journal provides an international forum for the exchange of knowledge and the discussion of current issues in wood and its utilization. The journal publishes original articles on basic and applied research dealing with the science, technology, and engineering of wood, wood components, wood and wood-based products, and wood constructions. Articles concerned with pulp and paper, fiber resources from non-woody plants, wood-inhabiting insects and fungi, wood biomass, and environmental and ecological issues in forest products are also included. In addition to original articles, the journal publishes review articles on selected topics concerning wood science and related fields. The editors welcome the submission of manuscripts from any country.
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