Critical role of reducing interfacial friction in compressive creep characterisation of pinewood

IF 3.1 2区 农林科学 Q1 FORESTRY
Hong Luo, Zhijie Xie, Lijun Li, Kai Liao, Shuai Ma, Yingfeng Zuo
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引用次数: 0

Abstract

Compressive creep tests (CCTs) are widely used in viscoelastic characterisation of wood. However, the prevalent use of dry friction conditions in wood CCTs often introduces considerable uncertainties into the acquired creep data. To address this critical issue, this study proposes a simple yet more accurate CCT-based strategy for viscoelastic characterisation of wood. In this strategy, oil-lubricated conditions are first designed to reduce interfacial friction in CCTs, followed by optimally fitting of the obtained creep data using multi-element (generalised) viscoelastic models. To validate this strategy, comparative CCTs of typical pinewood samples under both oil-lubricated and dry-friction conditions are conducted, and numerical simulations of the CCTs are further performed. The results indicate that: (i) the axial deformation of pinewood in dry-friction CCTs can be significantly underestimated (by up to 28.45%), leading to unrealistic creep data and viscoelastic parameters. (ii) Viscoelastic parameters calibrated from lubricated CCTs can achieve the desired creep prediction accuracy (97.09%), demonstrating a 19.28% improvement over those from unlubricated CCTs. The findings of this study highlight the critical role of reducing interfacial friction in CCTs of the pinewood, with broader implications for the accurate characterisation and prediction of the creep behavior in various woods and timber structures.

减少界面摩擦在松木压缩蠕变特性中的关键作用
压缩蠕变试验(CCTs)广泛应用于木材的粘弹性表征。然而,在木材cct中普遍使用的干摩擦条件通常会给获得的蠕变数据带来相当大的不确定性。为了解决这一关键问题,本研究提出了一种简单但更准确的基于cct的木材粘弹性表征策略。在该策略中,首先设计油润滑条件以减少cct中的界面摩擦,然后使用多元素(广义)粘弹性模型对获得的蠕变数据进行优化拟合。为了验证这一策略,进行了典型松木样品在油润滑和干摩擦条件下的cct对比,并进一步进行了cct的数值模拟。结果表明:(1)松木在干摩擦cct中的轴向变形可能被严重低估(高达28.45%),导致蠕变数据和粘弹性参数不真实。(ii)润滑后的cct标定的粘弹性参数可以达到预期的蠕变预测精度(97.09%),比未润滑的cct提高19.28%。这项研究的结果强调了减少松木cct界面摩擦的关键作用,对各种木材和木结构的蠕变行为的准确表征和预测具有更广泛的意义。
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
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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