Short-term hygro-mechanical behaviour of lime wood (Tilia cordata) in principal anatomical directions

IF 2.2 3区农林科学 Q2 FORESTRY

Holzforschung Pub Date : 2024-02-12 DOI:10.1515/hf-2023-0029

Daniel Konopka, Benjamin Grohmann, Jens Gecks, Wolfram Scheiding, Michael Kaliske

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Abstract

The hygroscopic and moisture-dependent mechanical characteristics of small-leaved lime wood (Tilia cordata) were investigated experimentally. This study includes sorption, swelling and shrinkage experiments, as well as tension and compression tests in the three principal anatomical directions at four relative humidity levels. Four sample groups from trees of three different locations in Germany were used. The findings are comparable to those of earlier studies. The hygro-expansion anisotropy is relatively small. Young’s moduli at tension/compression decreased by about 52 %/64 % in radial, 19 %/48 % in tangential and 16 %/58 % in longitudinal direction for an increase of moisture content from 10 % (65 % RH) to 20 % (95 % RH). Tension strengths/compression yield stresses decreased by about 25 %/45 % in radial, 9 %/42 % in tangential, and 32 % (compression) in longitudinal direction, respectively. These parameters increased with an increasing density. Based on the mechanical tests, Young’s modulus, tension strength and compression yield stress were derived as density- and moisture-dependent material model parameters. Shear modulus and shear strength were estimated by a theoretical approach. The experimental and modelling study was accompanied by a literature survey on characteristics of lime wood relevant for hygro-mechanical material modelling.

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椴木（Tilia cordata）在主要解剖方向上的短期湿力学行为

实验研究了小叶椴木（Tilia cordata）的吸湿性和随湿度变化的机械特性。这项研究包括吸附、膨胀和收缩实验，以及在四个相对湿度水平下三个主要解剖方向的拉伸和压缩试验。使用了来自德国三个不同地点的四组树木样本。实验结果与之前的研究结果相当。湿胀各向异性相对较小。当含水量从 10%（相对湿度 65%）增加到 20%（相对湿度 95%）时，拉伸/压缩时的杨氏模量径向下降了约 52%/64%，切向下降了约 19%/48%，纵向下降了约 16%/58%。径向拉伸强度/压缩屈服应力分别降低了约 25%/45%，切向拉伸强度/压缩屈服应力分别降低了约 9%/42%，纵向拉伸强度/压缩屈服应力分别降低了约 32%。这些参数随着密度的增加而增加。根据机械测试结果，得出了杨氏模量、拉伸强度和压缩屈服应力作为密度和湿度相关的材料模型参数。剪切模量和剪切强度是通过理论方法估算的。在进行实验和建模研究的同时，还对与湿力学材料建模相关的椴木特性进行了文献调查。

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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来源期刊

Holzforschung 工程技术-材料科学：纸与木材

CiteScore

4.60

自引率

4.20%

发文量

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.