Wood Science and Technology最新文献_第2页

Phenolic compounds related to heartwood coloration of Millettia pendula 与悬铃木心材着色有关的酚类化合物

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-09-11 DOI: 10.1007/s00226-024-01600-y

Yusuke Taga, Kosei Yamauchi, Tohru Mitsunaga

引用次数: 0

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

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-09-11 DOI: 10.1007/s00226-024-01577-8

Josef Stöcklein, Gerald Grajcarek, Daniel Konopka, Michael Kaliske

{"title":"Hygro-mechanical long-term behaviour of spruce, pine and lime wood: parameter identification and model validation","authors":"Josef Stöcklein, Gerald Grajcarek, Daniel Konopka, Michael Kaliske","doi":"10.1007/s00226-024-01577-8","DOIUrl":"10.1007/s00226-024-01577-8","url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00226-024-01577-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Combined analysis of the microstructure of wood swollen by water and/or ethanol through dynamic mechanical analysis and small-angle X-ray scattering 通过动态力学分析和小角 X 射线散射综合分析受水和/或乙醇影响而膨胀的木材的微观结构

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-09-05 DOI: 10.1007/s00226-024-01599-2

Hiroaki Horiyama, Keisuke Kojiro, Yoko Okahisa, Tomoya Imai, Yuzo Furuta

{"title":"Combined analysis of the microstructure of wood swollen by water and/or ethanol through dynamic mechanical analysis and small-angle X-ray scattering","authors":"Hiroaki Horiyama, Keisuke Kojiro, Yoko Okahisa, Tomoya Imai, Yuzo Furuta","doi":"10.1007/s00226-024-01599-2","DOIUrl":"10.1007/s00226-024-01599-2","url":null,"abstract":"<div><p>Dynamic mechanical analysis and small-angle X-ray scattering (SAXS) measurements of hinoki wood swollen with water and/or ethanol in the temperature range of 20–78/95 °C were performed to clarify the relationship between swelling and microstructure in different swelling states. For the sample swollen in a water–ethanol mixture with an ethanol mole fraction of 0.2, a peak in tan<i>δ</i>, i.e., the ratio of the dynamic elastic modulus (<i>E′</i>) to the dynamic loss modulus (<i>E″</i>), was observed at around 50 °C. No clear peak was observed in the temperature range of the sample swollen with water or ethanol, but thermal softening behavior due to micro-Brownian motion of lignin was observed. The scattering behavior of the samples swollen with water and/or ethanol differed significantly from one solution to another. The SAXS intensity of samples swollen with water or mixture of water and ethanol increased with increasing temperature, while the SAXS intensity of samples swollen with ethanol changed little with increasing temperature. This suggested that the adsorption sites of ethanol were different. The position of the peak for the sample swollen with the water–ethanol mixture, observed in the Kratky plot, was shifted to the low-<i>q</i> side compared to the pure liquid. It was suggested that the aggregation state of the sample swollen with the mixture of water and ethanol was very different from those of the wood swollen with the pure liquid.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Combined impact of moisture and temperature on cellulose nanocrystal interface degradation by molecular dynamics simulation 分子动力学模拟水分和温度对纤维素纳米晶界面降解的综合影响

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-09-02 DOI: 10.1007/s00226-024-01598-3

Jialiang Li, Yujun Li, Zhengdao Li, Yongkang Wang, Jianjun Jiang

{"title":"Combined impact of moisture and temperature on cellulose nanocrystal interface degradation by molecular dynamics simulation","authors":"Jialiang Li, Yujun Li, Zhengdao Li, Yongkang Wang, Jianjun Jiang","doi":"10.1007/s00226-024-01598-3","DOIUrl":"10.1007/s00226-024-01598-3","url":null,"abstract":"<div><p>Cellulose nanocrystals (CNCs), derived from abundant natural cellulose, possess exceptional properties including low weight, bioavailability, and high mechanical performance. During shear loading, CNCs exhibit unique stick–slip behavior, making them excellent toughening materials for CNC neat films and nanocomposite. However, the failure behavior at the interface under specific conditions, particularly moisture and temperature, remains unclear. The study utilized molecular dynamics (MD) simulations to quantitatively investigate the hydrothermal effect on the degradation of CNC interface. The degradation mechanism induced by moisture and temperature was indicated through the reduction of adhesive energy and peak force with the consideration of hydrogen bonds. The simulation results showed that the role of water molecules in the interfacial failure depends their content. Water acted as a binder at low moisture levels, while at high moisture levels, it acted as a lubricant. Besides, temperature had a more pronounced impact on the interfacial shear performance. Our simulation results can be used as input in micromechanical models to bridge the gap between the macroscopic and microscopic behavior of films and nanocomposites.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Accuracy of digital image correlation system with telecentric lens for compression tests of wood 带远心镜头的数字图像相关系统在木材压缩试验中的准确性

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-08-31 DOI: 10.1007/s00226-024-01597-4

Masaki Teranishi, Doppo Matsubara

{"title":"Accuracy of digital image correlation system with telecentric lens for compression tests of wood","authors":"Masaki Teranishi, Doppo Matsubara","doi":"10.1007/s00226-024-01597-4","DOIUrl":"10.1007/s00226-024-01597-4","url":null,"abstract":"<div><p>The digital image correlation (DIC) system is a powerful tool for measuring distributions of displacement and strain on the surface of a specimen. DIC systems are employed not only for homogeneous materials such as metals but also for heterogeneous materials such as wood. Although numerous validations of DIC system accuracy for metallic materials exist, the accuracy verification for wood, especially under multiaxial stress conditions, is less common. This study investigated the accuracy of a DIC system equipped with a bilateral telecentric lens on wood (Douglas fir). The accuracy verification in uniaxial stress fields was conducted through full compression testing, while verification in multiaxial stress fields was performed through partial compression testing. Additionally, compression tests on A6063 (aluminium alloy) were conducted to examine the differences in the DIC system accuracy between homogeneous and heterogeneous materials. The accuracy of the DIC system was assessed by comparing the results with those obtained from strain gauges. The results from the full compression tests indicate that the accuracy of axial strain measured by the DIC system was comparable for the specimens of A6063 and Douglas fir in the longitudinal (L) direction but was inferior for Douglas fir in the radial (R) direction. This is because the differences in the mechanical properties of earlywood and latewood produce high strain gradients. Furthermore, the differences in Young’s modulus obtained from the DIC system and strain gauge for the specimens of A6063, Douglas fir (L), and Douglas fir (R) were − 1.23%, 2.26%, and − 12.5%, respectively. In the partial compression tests, the accuracy of strain components measured by the DIC system in the specimens of Douglas fir (R) was lower than that in A6063. In the partial compression tests, high strain gradients appear in multiple strain components, leading to a notable decrease in the accuracy of the DIC system compared to the full compression tests.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Fracture energy of birch in tension perpendicular to grain: experimental evaluation and comparative numerical simulations 桦木在垂直于纹理的拉伸状态下的断裂能：实验评估和数值模拟比较

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-08-28 DOI: 10.1007/s00226-024-01595-6

Johannes Jonasson, Henrik Danielsson, Erik Serrano

{"title":"Fracture energy of birch in tension perpendicular to grain: experimental evaluation and comparative numerical simulations","authors":"Johannes Jonasson, Henrik Danielsson, Erik Serrano","doi":"10.1007/s00226-024-01595-6","DOIUrl":"10.1007/s00226-024-01595-6","url":null,"abstract":"<div><p>The present work has experimentally determined the specific fracture energy of the hardwood species silver birch (<i>Betula pendula</i>), which in recent times has caught increased attention for utilization in structural applications. The single-edge-notched beam loaded in three-point-bending was utilized for evaluating the fracture energy with the work-of-fracture method. In addition to birch, Norway spruce (<i>Picea abies</i>) was utilized as a reference material. The effect of two different geometries of the fracture area for each species was evaluated—one triangular and one rectangular fracture area. It should be noted that the geometry of the fracture area did influence the evaluated fracture energy, and this influence was not consistent between species. This was likely in part due to manufacturing difficulties with the triangular fracture area. In addition to the experimental testing, a numerical 2d-model including linear strain-softening behavior was used for comparative simulations. The numerical 2d-models showed reasonable agreement with the experimental results regarding the global load vs. displacement response, despite their relative simple nature. The specific fracture energy for the spruce specimens was evaluated to 221 J/<span>(hbox {m}^2)</span> and for the birch specimens to 656 J/<span>(hbox {m}^2)</span>. Consequently, the present work implies a marked increase in specific fracture energy for birch, compared to spruce. This increase in specific fracture energy could potentially have a large influence on the failure behavior of birch when used in structural applications which is something that needs to be considered in future work.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00226-024-01595-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Green and sustainable fabrication of DES-pretreated high-strength densified wood 以绿色和可持续的方式制造经 DES 处理的高强度致密化木材

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-08-27 DOI: 10.1007/s00226-024-01594-7

Akash Madhav Gondaliya, Mahfuzul Hoque, Sreenath Raghunath, E. Johan Foster

{"title":"Green and sustainable fabrication of DES-pretreated high-strength densified wood","authors":"Akash Madhav Gondaliya, Mahfuzul Hoque, Sreenath Raghunath, E. Johan Foster","doi":"10.1007/s00226-024-01594-7","DOIUrl":"10.1007/s00226-024-01594-7","url":null,"abstract":"<div><p>Wood is a sustainable, benign, and high-performing green structural material readily available in nature that can be used to replace structural materials. However, insufficient mechanical performance (compared to metals and plastic), moisture sensitivity, and susceptibility to microorganism attack make it challenging to use wood as it is for advanced engineering applications. We here present an efficient approach to fabricating densified wood with minimal time and waste generation, demonstrating high mechanical strength, and decreased water penetration on the surface. Wood slabs were treated with deep eutectic solvents (DESs) to solubilize the lignin, followed by in-situ regeneration of dissolved lignin in the wood. Then, the slabs were densified with heat and pressure, turning the wood into a functionalized densified material. Lignin regeneration and morphological changes were observed via two-photon microscopy and Scanning Electron Microscopy (SEM), respectively. The final product is less susceptible to water absorption on the surface and has enhanced flexural strength (> 50% higher), surface hardness (100% increased), and minimal set recovery compared to natural wood. The improved mechanical performance is due to regenerated lignin which acts as a glue and fills spaces present within the interconnected cellulose network inside the wood, forming a highly dense composite during densification. Such enhancement in the properties of DES-densified wood composite makes it a favorable candidate for advanced structural and engineering applications.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00226-024-01594-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modification of aspen wood ethanol lignin via azo coupling: promising polymers from renewable plant biomass 通过偶氮偶联对杨木乙醇木质素进行改性：从可再生植物生物质中提取有前景的聚合物

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-08-20 DOI: 10.1007/s00226-024-01590-x

Viktor A. Golubkov, Valentina S. Borovkova, Maxim A. Lutoshkin, Nikolay A. Zos’ko, Natalya Yu. Vasilieva, Yuriy N. Malyar

引用次数: 0

Unveiling the evolution of structures and properties of wingceltis (Pteroceltis tatarinowii) phloem fibers throughout the traditional pulping process 揭示翼状木（Pteroceltis tatarinowii）韧皮部纤维在整个传统制浆过程中的结构和特性演变

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-08-20 DOI: 10.1007/s00226-024-01573-y

Bingwei Chen, Michaela Eder, Yu’na Kan, Shengcheng Zhai, Hao Ren, Changtong Mei, Wujun Xiao

{"title":"Unveiling the evolution of structures and properties of wingceltis (Pteroceltis tatarinowii) phloem fibers throughout the traditional pulping process","authors":"Bingwei Chen, Michaela Eder, Yu’na Kan, Shengcheng Zhai, Hao Ren, Changtong Mei, Wujun Xiao","doi":"10.1007/s00226-024-01573-y","DOIUrl":"10.1007/s00226-024-01573-y","url":null,"abstract":"<div><p>Xuan paper is a classic Chinese handmade paper with long history and has been listed as a national intangible cultural heritage since 2009, which is mainly composed of wingceltis (<i>Pteroceltis tatarinowii</i>) phloem fibers and straw fibers. Due to the unique properties of wingceltis phloem fibers, Xuan paper is spotless, flexible, stable, and durable, and is widely used by calligraphers, painters, or museums for restoration. Uncovering the variation of phloem fiber properties throughout the traditional pulping process is essential for a comprehensive understanding of the special performance of Xuan paper. In this study, chemical, structural, and mechanical characterization was conducted on the raw bark (phloem fiber), treated phloem fiber, and pulp fiber at different steps of the traditional pulping process for making Xuan paper. The compositional and morphological analysis revealed the effective removal of the matrix polymers, while the phloem fiber almost retained the original fiber structure during the traditional process. Wide-angle X-ray scattering results indicated that the relative crystallinity of cellulose increased and crystals expanded after the lime cooking and exposure to sun and rain. Compared to the raw phloem fibers, the ultimate stress and tensile stiffness of pulp fibers decreased by 24.35% and 9.79%, respectively. However, the fracture strain and fracture toughness of pulp fibers showed a drastic promotion, which might be attributed to the energy dissipation caused by the cell wall structure, the breaking and reforming of hydrogen bonds, and the slipping and rearrangement of cellulose microfibrils.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Exploring visible spectrum wavelengths in light transmission through wood material 探索可见光谱波长在木质材料中的透射率

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-08-17 DOI: 10.1007/s00226-024-01586-7

Juliette Boivin, Damien Teyssieux, Luc Froehly, Stéphane Girardon, Louis Denaud

{"title":"Exploring visible spectrum wavelengths in light transmission through wood material","authors":"Juliette Boivin, Damien Teyssieux, Luc Froehly, Stéphane Girardon, Louis Denaud","doi":"10.1007/s00226-024-01586-7","DOIUrl":"10.1007/s00226-024-01586-7","url":null,"abstract":"<div><p>Wood is a multiscale heterogeneous natural composite material with properties depending on its growing conditions and its genetic heritage. This variability is challenging for industries that work to perform homogeneous and reliable products. In industry, different non-destructive testing methods are in use to classify, grade, and select wood products to optimize their usage. Among them, the use of lasers to detect fiber orientation with different wavelengths. This orientation significantly influences the mechanical behavior of wood, including stress limits and stiffness. According to our knowledge, the use of laser diffusion still is limited to grain angle measurement. Our objective in this paper is to realize transmission light scattering maps for wood samples from several wood species (poplar, oak, Douglas fir, beech), and then identify the most suitable wavelength to study light diffusion in wood, depending on the property that will be measured. A supercontinuum laser is used over a wavelength range from 500 to 800 nm, allowing precise adjustment of the wavelengths. It was found that near-infrared light better scatters in the studied wood species than lower wavelength. However, the wavelength that gives the best contrast between earlywood and latewood depends on the sample studied and is not necessarily in the near infrared rays.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00226-024-01586-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0