Wood Material Science & Engineering最新文献_第10页

Experimental investigations on the bearing properties of bamboo scrimber joints by a bolted bamboo-steel-bamboo connection 竹-钢-竹螺栓连接竹材连接节点承载性能试验研究

IF 2.2 3区农林科学

Wood Material Science & Engineering Pub Date : 2023-04-03 DOI: 10.1080/17480272.2023.2193816

Q. Cao, Yang Wei, Yu Lin, Mingmin Ding, Kai-dong Zheng

{"title":"Experimental investigations on the bearing properties of bamboo scrimber joints by a bolted bamboo-steel-bamboo connection","authors":"Q. Cao, Yang Wei, Yu Lin, Mingmin Ding, Kai-dong Zheng","doi":"10.1080/17480272.2023.2193816","DOIUrl":"https://doi.org/10.1080/17480272.2023.2193816","url":null,"abstract":"ABSTRACT In this study, a total of forty-two joint specimens were designed to explore the properties of the bolted bamboo-steel-bamboo connection under axial tension. Key design parameters were selected as variables, including the bolt end distance, diameter, and number. Failure modes and mechanical properties were analyzed from the aspects of both bolts and joints. Finally, modified from calculation formula for the bearing capacity of bolted joints in wood structures, the design method for the tested bamboo scrimber connection joint was proposed for the bearing capacity while considering the influence of bolt diameter and bolt number. According to the experimental results, the joint failure was mainly controlled by the bamboo scrimber bearing capacity and bolt bending. Within the design scope, the influence of bolt end distance on the bearing capacity of the joint can be ignored. The bearing capacity of the joint increases with the increase of the bolt diameter. For single-row bolt connection, the bearing capacity of the joint increases with the increase of the number of bolts. The modified formula of single-bolt bearing capacity in the Chinese design codes and multi-bolt bearing capacity in the European code for design of wood structures are in best agreement with the test results.","PeriodicalId":48567,"journal":{"name":"Wood Material Science & Engineering","volume":"18 1","pages":"1790 - 1808"},"PeriodicalIF":2.2,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49089726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Impregnation of Norway spruce with low melting-point binary fatty acid as a phase-change material 用低熔点二元脂肪酸作为相变材料浸渍挪威云杉

IF 2.2 3区农林科学

Wood Material Science & Engineering Pub Date : 2023-03-15 DOI: 10.1080/17480272.2023.2186266

J. Grzybek, Z. Paschová, P. Meffert, A. Petutschnigg, T. Schnabel

{"title":"Impregnation of Norway spruce with low melting-point binary fatty acid as a phase-change material","authors":"J. Grzybek, Z. Paschová, P. Meffert, A. Petutschnigg, T. Schnabel","doi":"10.1080/17480272.2023.2186266","DOIUrl":"https://doi.org/10.1080/17480272.2023.2186266","url":null,"abstract":"Abstract\u0000 Norway spruce was impregnated with a eutectic mixture of capric acid and stearic acid. The binary fatty acid was used as a bio-based phase-change material (PCM) for further applications with wood as a latent heat-storage material in building components. For this purpose, different concentrations of impregnation were evaluated. The weight-percentage gain of 124% was the highest for the pure fatty acid mixture, and the PCM-impregnated wood increased density from 470 kg/m³ (untreated wood) to 1045 kg/m³. Compressive strength and hardness were significantly elevated with higher content of fatty acids in the wood. Microscopy analysis confirmed the presence of the PCM within the wood cells. The treated wood also exhibited a larger time delay during heating and cooling due to the temperature shift in the phase transition. Depending on the concentration of the fatty acid in the wood, the latent heat during melting ranged from 50 to 125 J/g in the temperature from about 24°C to 30°C. These results suggest that the use of the capric acid and stearic acid mixture has a great potential to increase the heat-storage capacity of wood and reduce energy consumption for heating and cooling indoor spaces.","PeriodicalId":48567,"journal":{"name":"Wood Material Science & Engineering","volume":"18 1","pages":"1755 - 1764"},"PeriodicalIF":2.2,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42898951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effect of hot-pressing and hydrothermal parameters on recycled wood particles and particleboards 热压和水热参数对再生木颗粒和刨花板的影响

IF 2.2 3区农林科学

Wood Material Science & Engineering Pub Date : 2023-03-15 DOI: 10.1080/17480272.2023.2186262

Lidong Shi, Chuanshuang Hu, Weiwei Zhang, Xiuyi Lin

引用次数: 0

Acoustic properties of glued laminated bamboo and spruce-pine-fir 竹-云杉-松木胶合层合板的声学特性

IF 2.2 3区农林科学

Wood Material Science & Engineering Pub Date : 2023-03-13 DOI: 10.1080/17480272.2023.2187318

Y. Kong, Jie Wen, Anxu Huang, Lejun Zhou, Yan Xiao

{"title":"Acoustic properties of glued laminated bamboo and spruce-pine-fir","authors":"Y. Kong, Jie Wen, Anxu Huang, Lejun Zhou, Yan Xiao","doi":"10.1080/17480272.2023.2187318","DOIUrl":"https://doi.org/10.1080/17480272.2023.2187318","url":null,"abstract":"Abstract Noise pollution has become a worldwide issue, which has a negative effect on human health. The sound reduction index and absorption coefficient of glued laminated bamboo (glubam) and spruce-pine-fir (SPF) were firstly measured in this study by using the impedance tube method. The effect of moisture content on the acoustic performance of these materials was also investigated. Experimental results revealed that for thick-strip glubam and SPF, the higher moisture content, the higher sound reduction index but lower sound absorption coefficient. However, moisture content does not have an obvious effect on acoustic properties of thin-strip glubam. By comparing with other materials, it can be found that glubam and SPF have relatively high normal-incidence transmission loss but low absorption coefficient and noise reduction coefficient. Glubam shows the similar but even better acoustic insulation performance than SPF, which confirms the possibility of using glubam as an alternative of wood materials. Moreover, a finite element model was built up to simulate the measurement of sound transmission loss in an impedance tube. Some parametric studies were then conducted using the finite element model to prove the effectiveness of increasing thickness, using composites and double-layer panels on improving the soundproof performance of materials.","PeriodicalId":48567,"journal":{"name":"Wood Material Science & Engineering","volume":"18 1","pages":"1765 - 1779"},"PeriodicalIF":2.2,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46649263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of visible knots on relative visual attractiveness of furniture fronts made of pine wood (Pinus sylvestris L.) 可见结对松木家具正面相对视觉吸引力的影响(Pinus sylvestris L.)

IF 2.2 3区农林科学

Wood Material Science & Engineering Pub Date : 2023-03-09 DOI: 10.1080/17480272.2023.2186263

K. Śmietańska, J. Górski

{"title":"Impact of visible knots on relative visual attractiveness of furniture fronts made of pine wood (Pinus sylvestris L.)","authors":"K. Śmietańska, J. Górski","doi":"10.1080/17480272.2023.2186263","DOIUrl":"https://doi.org/10.1080/17480272.2023.2186263","url":null,"abstract":"ABSTRACT The main goal of this paper was to check if either the number or the composition (the arrangement or placement) of knots visible on the furniture fronts could be effective predictors of their relative visual attractiveness. Five different groups of human experts (73 people total) filled out a special online questionnaire, which contained 99 furniture front photos. The experts were asked to rate the relative attractiveness of the fronts using the 5-point Likert scale. It was found that an increase in the number of knots in the range of 0–4 significantly reduced the relative attractiveness of the front, but a further increase (from 4 to 8) made no statistically significant difference. Furthermore, the opinions of all expert groups turned out to be very similar, regardless of their professionalism in the field of interior or furniture design. No other (than the number of knots) predictors of the attractiveness of the fronts (such as the arrangement or placement of visual knots) could be found. The effectiveness of the number of knots as the only predictor of the visual attractiveness of cabinet doors (made of pine wood) was 61% or 87%, depending on the form of classification.","PeriodicalId":48567,"journal":{"name":"Wood Material Science & Engineering","volume":"18 1","pages":"1749 - 1754"},"PeriodicalIF":2.2,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49223446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Increasing efficiency of an industrial robot when machining timber beams – introduction of a parametric solving model to determine optimised stacks 提高工业机器人在加工木梁时的效率——引入参数求解模型来确定优化堆栈

IF 2.2 3区农林科学

Wood Material Science & Engineering Pub Date : 2023-03-08 DOI: 10.1080/17480272.2023.2183897

Marc Pantscharowitsch, Jakob Witzeneder, B. Kromoser

{"title":"Increasing efficiency of an industrial robot when machining timber beams – introduction of a parametric solving model to determine optimised stacks","authors":"Marc Pantscharowitsch, Jakob Witzeneder, B. Kromoser","doi":"10.1080/17480272.2023.2183897","DOIUrl":"https://doi.org/10.1080/17480272.2023.2183897","url":null,"abstract":"ABSTRACT The aim of this study was to increase the economic efficiency of industrial robots (IR) when subtractive machining timber beams. The most compact possible stack configuration, consisting of three different workpiece geometries, was calculated and machined. When compared to machining individual workpieces, a reduction of the process time is strived for. The workspace of the IR should be fully utilised by an optimised spatial stack configuration (number, location and spacing of workpieces). The stacks were calculated using a parameterised evolutionary solver model in Rhinoceros, Grasshopper, Galapagos and Opossum software. Machining trials were performed to obtain process time data for the IR and as a reference for a benchmark joinery machine (JM). By applying the newly introduced optimisation model, the process time per workpiece, when machining stacks instead of individual specimens, was reduced by 16%. This result was primarily achieved by shifting the share of non-machining time to machining time. When compared to individual machining with a JM, the process time of the IR is still higher. This fact can be outweighed by advantages of IRs such as cost, availability and flexibility, showing that the overall economic efficiency of IRs does in fact hold potential for prefabrication in the timber construction sector.","PeriodicalId":48567,"journal":{"name":"Wood Material Science & Engineering","volume":"18 1","pages":"1724 - 1740"},"PeriodicalIF":2.2,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45607463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of laminate configuration on the mechanical properties of model glued-laminated timber composed of single and mixed tropical fast-growing tree species 层压板结构对热带速生树种单一和混合胶合层压板力学性能的影响

IF 2.2 3区农林科学

Wood Material Science & Engineering Pub Date : 2023-03-06 DOI: 10.1080/17480272.2023.2175254

A. Ngadianto, F. Ishiguri, I. Nezu, D. Irawati, J. Ohshima, S. Yokota

{"title":"The effect of laminate configuration on the mechanical properties of model glued-laminated timber composed of single and mixed tropical fast-growing tree species","authors":"A. Ngadianto, F. Ishiguri, I. Nezu, D. Irawati, J. Ohshima, S. Yokota","doi":"10.1080/17480272.2023.2175254","DOIUrl":"https://doi.org/10.1080/17480272.2023.2175254","url":null,"abstract":"ABSTRACT The effects of laminate configuration on mechanical properties were investigated for model glued-laminated timber (GLT) composed of single and mixed fast-growing tree species (Acacia mangium Willd., Maesopsis eminii Engl., and Melia azedarach L.), which were grown in community forests in Indonesia. The simulation of lamina yield was decreased in graded GLT compared with that in GLT with randomly designed, while the mean values of simulated dynamic Young’s modulus (DMOE) in graded GLT were higher than those of GLT with randomly designed in each species. Graded GLT with mixed species should be produced to effectively utilize wood resources from fast-growing tree species. All mechanical properties showed higher values in single-species GLT especially for graded GLT, compared with solid lumber, suggesting that laminate configuration was effective for increasing mechanical properties. However, the factors that increase mechanical properties in single-species GLT differed among species. These factors can be evaluated by load-deflection curves. In GLT composed of single and mixed species produced with the same DMOE, almost all other mechanical properties were similar among laminate configurations. It is concluded that laminate configurations with different species and grades are useful for efficiently producing GLT with higher mechanical properties from multiple fast-growing tree species.","PeriodicalId":48567,"journal":{"name":"Wood Material Science & Engineering","volume":"18 1","pages":"1676 - 1684"},"PeriodicalIF":2.2,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43646723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-scale investigation of the mechanical properties of Loblolly pine wood at elevated temperature 火炬松木材高温力学性能的多尺度研究

IF 2.2 3区农林科学

Wood Material Science & Engineering Pub Date : 2023-03-04 DOI: 10.1080/17480272.2022.2053203

Xinzhou Wang, Ya-qin Huang, Chenglong Lv, Junfeng Wang, Siqun Wang, Yan Yao

{"title":"Multi-scale investigation of the mechanical properties of Loblolly pine wood at elevated temperature","authors":"Xinzhou Wang, Ya-qin Huang, Chenglong Lv, Junfeng Wang, Siqun Wang, Yan Yao","doi":"10.1080/17480272.2022.2053203","DOIUrl":"https://doi.org/10.1080/17480272.2022.2053203","url":null,"abstract":"ABSTRACT The micromechanics of wood cell walls and the bending properties of wood were investigated by using nanoindentation and macromechanical test machine at elevated temperature, respectively. The microstructure of wood at the temperatures ranged from 20 to 160°C was also observed by optical microscope and scanning electron microscope. Results indicated that the increased temperature accompanying with the moisture release affected the mechanical behavior of wood on both cell-wall level and macroscale. The cell wall’s elastic modulus (E r) and hardness (H) decreased as temperature increased to 80°C due to the softening of wood polymers under hot and humid condition. On the contrary, both the E r and H increased when the temperature was above 100°C ascribed to the massive release of moisture. The increased mechanical properties of the thick-wall cells made a major contribution to the improved bending properties of wood at the macroscale. Furthermore, the cell walls at 80°C own the highest indentation creep ratio (C IT), that is, wood are easier to creep under a constant load. In hence, the mechanical stability of timber in constructions at about 80°C shall be paid more attention.","PeriodicalId":48567,"journal":{"name":"Wood Material Science & Engineering","volume":"18 1","pages":"517 - 524"},"PeriodicalIF":2.2,"publicationDate":"2023-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44453680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Changes in chemical composition, crystallinity, and microstructure of wood fiber mat-reinforced composite caused by white-rot fungus Trametes versicolor and brown-rot fungus Gloeophyllum trabeum 白腐菌和褐腐菌对木纤维毡增强复合材料化学成分、结晶度和微观结构的影响

IF 2.2 3区农林科学

Wood Material Science & Engineering Pub Date : 2023-02-20 DOI: 10.1080/17480272.2023.2180431

Minzhen Bao, Weigang Zhang, Lihui He, Yongjie Bao, Zaixing Wu, Wenji Yu, Yuhe Chen, Neng Li

{"title":"Changes in chemical composition, crystallinity, and microstructure of wood fiber mat-reinforced composite caused by white-rot fungus Trametes versicolor and brown-rot fungus Gloeophyllum trabeum","authors":"Minzhen Bao, Weigang Zhang, Lihui He, Yongjie Bao, Zaixing Wu, Wenji Yu, Yuhe Chen, Neng Li","doi":"10.1080/17480272.2023.2180431","DOIUrl":"https://doi.org/10.1080/17480272.2023.2180431","url":null,"abstract":"ABSTRACT Wood fiber mat-reinforced composite (WFMRC) is a novel type of engineering wood-based polymer composite for decorative and building applications. Fungal decay strongly influences the service life of wood composites in outdoor environments. In this study, fungal durability tests were conducted to investigate how white- and brown-rot fungi (Trametes versicolor and Gloeophyllum trabeum, respectively) affect the chemical composition, crystallinity, and morphology of WFMRCs made from two different wood species (poplar and larch). The poplar WFMRC lost more mass (18.3% and 18.4% by T. versicolor and G. trabeum, respectively) than the decayed larch WFMRC (11.4% and 18.4% by T. versicolor and G. trabeum, respectively) after 12 weeks of fungal exposure. Chemical analysis and Fourier-transform infrared spectroscopy measurement revealed the degradation of holocellulose of the WFMRCs after fungal decay. X-ray diffraction analyses demonstrated that fungal decay increased the crystallinity of the poplar WFMRC but decreased the crystallinity of the larch WFMRC. Bore hole formation on the walls of wood cells, cell wall thinning, and collapsed cells were found in decayed samples, particularly in the poplar WFMRC. Although the WFMRCs could be classified as resistant to fungal decay, an appropriate protective measure should be considered to improve the outdoor durability of the WFMRC.","PeriodicalId":48567,"journal":{"name":"Wood Material Science & Engineering","volume":"18 1","pages":"1715 - 1723"},"PeriodicalIF":2.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48038493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

An experimental and theoretical analysis of the dynamic response of solar drying in natural convection under rainy month of Maroua (Cameroon) of three tropical wood species 三种热带木材在Maroua（喀麦隆）雨季自然对流中太阳干燥动态响应的实验和理论分析

IF 2.2 3区农林科学

Wood Material Science & Engineering Pub Date : 2023-02-20 DOI: 10.1080/17480272.2023.2178030

Tanenbé Teussingka, M. Simo-Tagne, Jacques Michel Njankouo, G. Betchewe, M. Ndukwu, N. Nwakuba, N. Bekkioui, A. Zoulalian

{"title":"An experimental and theoretical analysis of the dynamic response of solar drying in natural convection under rainy month of Maroua (Cameroon) of three tropical wood species","authors":"Tanenbé Teussingka, M. Simo-Tagne, Jacques Michel Njankouo, G. Betchewe, M. Ndukwu, N. Nwakuba, N. Bekkioui, A. Zoulalian","doi":"10.1080/17480272.2023.2178030","DOIUrl":"https://doi.org/10.1080/17480272.2023.2178030","url":null,"abstract":"ABSTRACT This work aims to study and characterize the drying kinetics, the heat mass transfer coefficients, the densities, the thermal effusivities, the thermal diffusivities and Young’s modulus of three tropical kinds of wood: ayous (triplochiton scleroxylon), sapelli (Entandrophragma cylindricum) and iroko (Milicia excelsa). A comparison has been doing between drying using a low expensive solar dryer in natural convection and drying using open-air conditions. The novelty of this work is to use an experimental study during the rainiest period in the city of Maroua, one city in Cameroon with a hard climate. Densities are influenced by the origin of the samples in the plank and increase linearly with the moisture content. At 30&per; of humidity (d.b), average densities of sapelli, iroko, and ayous were equal to 1000, 760 and 600 kg/m3 respectively. Thermal effusivities and thermal diffusivities increase linearly with the moisture content. Thermal diffusivities of the three kinds of wood are very near (2 × 10−7 m2/s at 30&per; of humidity (d.b)) and thermal effusivities increase with the wood densities with values located from 560 to 620 J/(K.m2.s0.5) at 30&per; of humidity (d.b). The heat mass transfer coefficients are influenced by the night and day and vary from 1.5 × 10−8–1.8 × 10−7 m/s for the global mass transfer coefficients, and from 1.8–6.5 W/(m2K) for the heat transfer coefficients. According to the variations of the values of young’s modulus and the drying kinetics, drying in open-air conditions is more rapid and not recommended than one in the solar dryer. The equilibrium humidity of all samples is near 10&per; (d.b).","PeriodicalId":48567,"journal":{"name":"Wood Material Science & Engineering","volume":"18 1","pages":"1685 - 1705"},"PeriodicalIF":2.2,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49469792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3