木材气候疲劳的初步评价:一种物理和计算方法

IF 3.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
A. Califano , A. Zanola , I. Di Terlizzi , M. Baiesi , C. Bertolin
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引用次数: 2

摘要

木材是优良的有机吸湿材料。由于它非常容易处理,它一直用于许多应用,特别是作为人工制品和艺术品的建筑材料。然而,它是高度气候敏感的,因为当自然或人为的小气候波动发生时,它通过与周围环境交换水分而膨胀或缩小。木材的收缩/膨胀,如果长时间重复,可能会导致变形或损坏,从而导致灾难性的失败。因此,在这项工作中,对重复小气候载荷对木制样品的影响进行了初步研究。为了做到这一点,已经实施了完善的疲劳方法,很少简化考虑。案例研究是一片苏格兰松,被认为是储存在Ringebu木板教堂(挪威)内。通过适当的传递函数,从从网络平台下载的室外温度数据开始,重建Ringebu室内小气候。重建的室内温度时间序列包括三个时期:远过去(1948-1977)、近过去(1981-2010)和远未来(2071-2100)。在这三个时期获得的结果使人们有可能深入了解气候引起的木材疲劳,并初步评估气候变化的影响。已经观察到,连续的相似温度波动可以潜在地视为一个恒定振幅和恒定频率的疲劳样负载块。最后,通过引入一些简化的考虑,已经评估了模拟行为与利用成熟的基于热的方法得到的理论行为是一致的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preliminary evaluation of the climate-induced fatigue in wood: A physical and computational approach

Wood is the organic hygroscopic material for excellence. Due to its extremely easy handling, it has always been used in many applications, especially as building material for artefacts and works of art. However, it is highly climate-susceptible as it swells or shrinks by exchanging moisture with the surrounding environment when natural or artificial microclimatic fluctuations occur. The shrinkage/swelling of wood, if repeated over time, may cause the arising of deformations or damage that may lead to catastrophic failures. For this reason, in this work, a preliminary study about the effect that repeated microclimatic loads have on wooden samples is carried out. To do so, well-established fatigue approaches have been implemented, with few simplifying considerations. The case study is a slice of Scots pine which is assumed to be stored inside Ringebu stave church (Norway). Ringebu indoor microclimate is reconstructed, through a proper transfer function, starting from outdoor temperature data downloaded from web platforms. The reconstructed indoor temperature timeseries cover three periods: far past (1948–1977), recent past (1981–2010) and far future (2071–2100). The results obtained for the three periods made it possible to gain insights about the climate-induced fatigue of wood and to preliminary assess the impact of climate change. It has been observed that successive similar temperature fluctuations can be potentially treated as a block of constant amplitude and constant frequency fatigue-like load. Finally, introducing few simplifying considerations, it has been assessed that the simulated behavior is coherent with the theoretical one coming from exploiting well-established thermo-based methods.

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来源期刊
Forces in mechanics
Forces in mechanics Mechanics of Materials
CiteScore
3.50
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