Hygro-mechanical long-term behaviour of spruce, pine and lime wood: parameter identification and model validation

IF 3.1 2区 农林科学 Q1 FORESTRY Wood Science and Technology Pub Date : 2024-09-11 DOI:10.1007/s00226-024-01577-8
Josef Stöcklein, Gerald Grajcarek, Daniel Konopka, Michael Kaliske
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Abstract

Lime wood, spruce and pine are investigated with regard to its hygro-mechanical long-term behaviour. Experiments are conducted for an identification of model parameters and for model validation. Swelling and shrinkage coefficients, dry density, sorption characteristics and parameters for visco-elasticity, visco-plasticity and mechano-sorption are determined for the main material directions. Supplemented by literature values, a complete set of parameters for long-term hygro-mechanical modelling of wood species is found. Constrained swelling and shrinkage are analysed and the origin of the stress development is investigated. It is demonstrated, that creep phenomena lead to significant stress reduction by relaxation, in case of moisture changes especially due to mechano-sorption. The influence of different model parts is investigated. A numerical parameter study shows the influence of several material parameters on the stress evolution. Experimental material investigations such as those presented here are essential for the application of numerical simulation methods for the prediction of material behaviour and for the assessment of deformations, stresses and damage potential of climatically loaded timber structures.

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云杉、松木和椴木的水文机械长期行为:参数识别和模型验证
研究了石灰木、云杉和松木的长期湿力学特性。为确定模型参数和验证模型进行了实验。确定了主要材料方向的膨胀和收缩系数、干密度、吸附特性以及粘弹性、粘塑性和机械吸附参数。在文献值的补充下,找到了一套完整的木材长期湿力学模型参数。对受约束的膨胀和收缩进行了分析,并研究了应力发展的起源。结果表明,在湿度变化的情况下,尤其是在机械吸附的情况下,蠕变现象会通过松弛导致应力的显著降低。研究了不同模型部件的影响。数值参数研究显示了几个材料参数对应力演变的影响。对于应用数值模拟方法预测材料行为以及评估气候荷载木结构的变形、应力和潜在损坏情况而言,本文介绍的材料实验研究是必不可少的。
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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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