Modelling the viscoelastic mechanosorptive behaviour of Norway spruce under long-term compression perpendicular to the grain
Modelling the viscoelastic mechanosorptive behaviour of Norway spruce under long-term compression perpendicular to the grain
复制标题
模拟挪威云杉在垂直于纹理的长期压缩下的粘弹性机械吸附行为
DOI：
10.1515/hf-2018-0218
复制
发表时间：
2019
期刊：
影响因子：
2.4
通讯作者：
K. Malo
中科院分区：
文献类型：
--
作者：
Francesco Mirko Massaro;K. Malo
摘要在长期荷载作用下，湿度变化会引起木构件的尺寸变化和蠕变效应。许多木制品，如交错层合板(CLT)以及木材工程中使用的许多常见结构细节，都容易受到含水率(MC)变化和蠕变效应的影响。本文讨论了木材材料有限元模拟中的长期效应，并考虑了木材中的粘弹性和力学吸附效应。通过松弛试验和蠕变试验对模型进行了标定。本文给出了挪威云杉(Picea Abies)伐木层(GL30c)在水分控制下进行的长期垂直压缩试验(松弛和蠕变)的结果。材料模型考虑了载荷和湿度变化的影响。为便于实际比较，在数值分析中指定了每个椎板的髓芯位置。最后，将数值计算结果与实验结果进行了比较，结果表明数值计算结果与实验结果具有较好的一致性。
Abstract The effects of variation in humidity coupled with long-term loading give rise to dimensional changes and creep effects in wooden elements. Many wooden products such as cross-laminated timber (CLT) plates as well as many common structural details used in timber engineering are vulnerable to variations in moisture content (MC) as well as to creep effects. This paper addresses the long-term effects in the material modelling of timber by the finite element method (FEM), also considering the viscoelastic and mechanosorptive effects in wood. The model was calibrated using both relaxation tests and creep tests. The results from both long-term compression perpendicular- to-grain tests (relaxation and creep) performed on glulam (GL30c) from Norway spruce (Picea abies) with moisture control are presented in this paper. The material model considers the effect of loading and moisture changes. For realistic comparison, the pith location of each lamella was specified in the numerical analyses. Ultimately, a comparison between the numerical results and the experimental results has been provided, exhibiting an overall good estimation of timber response.