{"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":"58 5-6","pages":"1951 - 1969"},"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}
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":"58 5-6","pages":"1925 - 1949"},"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}
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":"58 5-6","pages":"1901 - 1923"},"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}
Viktor A. Golubkov, Valentina S. Borovkova, Maxim A. Lutoshkin, Nikolay A. Zos’ko, Natalya Yu. Vasilieva, Yuriy N. Malyar
{"title":"Modification of aspen wood ethanol lignin via azo coupling: promising polymers from renewable plant biomass","authors":"Viktor A. Golubkov, Valentina S. Borovkova, Maxim A. Lutoshkin, Nikolay A. Zos’ko, Natalya Yu. Vasilieva, Yuriy N. Malyar","doi":"10.1007/s00226-024-01590-x","DOIUrl":"10.1007/s00226-024-01590-x","url":null,"abstract":"<div><p>Plant biomass, in particular forestry wastes, is a promising renewable feedstock for deep chemical processing. Organosolv methods allow the use of underutilized lignin. The synthesis of modified polymers by azo coupling with the use of aspen (<i>Populus tremula</i>) ethanol lignin and its sulfated modification is studied. The success of the synthesis has been proven and the features of the structure and properties of the synthesized samples were studied by the physicochemical techniques, including Fourier transform infrared and nuclear magnetic resonance spectroscopy, gel permeation chromatography and thermogravimetric analysis. It was shown that the new azopolymers have the ability to photoisomerize, which opens up prospects for their high-tech applications. The modified lignins are proven to be bioactive antioxidants.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 5-6","pages":"1861 - 1879"},"PeriodicalIF":3.1,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187362","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}
{"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":"58 5-6","pages":"1881 - 1899"},"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}
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":"58 5-6","pages":"1845 - 1859"},"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}
Manuel Peña-Ortiz, Luis Serrano, Juan Carbonero-Pacheco, Antonio A. Romero, Araceli García
{"title":"Evaluation of ornamental/exotic plant extracts as natural preservative methodology against termites and fungi","authors":"Manuel Peña-Ortiz, Luis Serrano, Juan Carbonero-Pacheco, Antonio A. Romero, Araceli García","doi":"10.1007/s00226-024-01593-8","DOIUrl":"10.1007/s00226-024-01593-8","url":null,"abstract":"<div><p>The present work investigated new sustainable opportunities for wood protection against xylophagous organisms (cellulolytic fungi and termites) based on the use of natural bioactive compounds present in <i>Milicia excelsa</i> wood and <i>Nerium oleander</i> bark. To achieve this, solid–liquid extractions by ethanol were carried out, obtaining extraction yields of 5.47 ± 0.78% for the extract of <i>M. excelsa</i> and 21.88 ± 0.53% for <i>N. oleander</i>. Gas chromatography coupled with mass spectrometry analyses were carried out to evaluate the chemical composition of both extracts, showing interesting compounds with biological activity such as pyrogallol, 4-acetylresorcinol, karanjin and scopoletin. Likewise, an evaluation of the cellulolytic capacity of different wood-isolated fungi (<i>Aspergillus flavus</i>, <i>Penicillium chrysogenum</i>, <i>Trichoderma longibrachiatum</i>, <i>Mucor circinelloides</i> and <i>Mucor fragilis</i>) was carried out through two screenings, based on their growth rate in carboxymethyl cellulose agar media, and their cellulose-degrading ability via filter paper rupture, being <i>T. longibrachiatum</i> the fungus with the highest growth rate in both substrates. Finally, a protective treatment for pine wood (<i>Pinus</i> sp.) was designed by using the ethanolic extracts separately and combined, respectively, against <i>T. longibrachiatum</i> and <i>Reticulitermes grassei</i>, comparing in both cases the biotic damage with a control. The results demonstrated that the impregnation significantly reduced <i>T. longibrachiatum</i> biomass consumption by over 70% for all treatments. Additionally, the <i>M. excelsa</i> impregnation notably decreased termite activity, with a 81% reduction in the long-term assays.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 5-6","pages":"1821 - 1843"},"PeriodicalIF":3.1,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187364","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}
Kangren Niu, Ying Li, Keyu Sun, Xuechun Feng, Li Zhang, Xiaozhou Song
{"title":"The chemical composition and antifungal activity of cork from Quercus variabilis","authors":"Kangren Niu, Ying Li, Keyu Sun, Xuechun Feng, Li Zhang, Xiaozhou Song","doi":"10.1007/s00226-024-01592-9","DOIUrl":"10.1007/s00226-024-01592-9","url":null,"abstract":"<div><p>In this study we separated the chemical components of cork from <i>Quercus variabilis</i> by various solvent extraction and alcoholysis methods. We identified the content and chemical composition of suberin and dichloromethane extract with gas chromatography-mass spectrometry (GC-MS) and analyzed the antifungal effects of different cork extracts against wood-decaying fungi. The results showed that the main structural component of cork, suberin, averaging 36.34% of the total dry weight, exhibited a pronounced inhibitory effect on wood-decaying fungi, compared to the dichloromethane extract. By the end of the entire culture period, the colony diameter of white rot fungi was 5 mm in the 40 mg/mL suberin treatment group, 19 mm for brown rot fungi, both significantly smaller than the control group (90 mm). Hydroxy fatty acids, free fatty acids, and α,ω-diacids may be the key components contributing to the antifungal activity of suberin. The inhibitory mechanism of suberin components on wood-decaying fungi may involve suppressing the respiratory metabolism of the fungi and increasing the permeability of their cell membranes, thereby limiting their normal life activities.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 5-6","pages":"1781 - 1796"},"PeriodicalIF":3.1,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187425","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}
Qifan Wang, Adina Baum, Linda Schreiner, Benedikt Slavik, Andrea Buettner, Helene M. Loos
{"title":"Sensory characterization and identification of odorants in birch wood (Betula pendula Roth)","authors":"Qifan Wang, Adina Baum, Linda Schreiner, Benedikt Slavik, Andrea Buettner, Helene M. Loos","doi":"10.1007/s00226-024-01575-w","DOIUrl":"10.1007/s00226-024-01575-w","url":null,"abstract":"<div><p>As one of the most common tree species, birch wood (<i>Betula pendula</i> Roth) is widely used as a material of furniture and decoration indoors for its many excellent characteristics. Whereas there are some studies on the volatile composition of the essential oil from the leaves of <i>Betula pendula</i> Roth, only limited information is available on the odor-active constituents of birch wood. To close this gap, the odorants of birch wood were investigated by means of instrumental and sensory analyses, including techniques such as gas chromatography-flame ionization detection/olfactometry, high-resolution gas chromatography-mass spectrometry, and heart-cut two-dimensional high-resolution gas chromatography-mass spectrometry/olfactometry. Overall, a total of 20 odorants was (tentatively) identified on the basis of their respective odor qualities and retention indices and mass spectra by comparison with reference compounds. It was shown that birch wood odor is dominated by a series of terpenes, terpenoids and phenyl compounds originating from the degradation of lignin and aldehydes, ketones and acids originating from fatty acid degradation. By a sensory evaluation of the birch wood, the predominant odor attributes were determined to be <i>earthy</i>, <i>pencil-like</i>, <i>corky/mouldy</i>, <i>grassy</i>, <i>fatty</i>, <i>fruity</i>, <i>green tea-like</i>, <i>herb-like</i>, <i>vanilla-like</i>, and <i>vinegar-like</i>.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 5-6","pages":"1761 - 1779"},"PeriodicalIF":3.1,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00226-024-01575-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187367","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}
Helene Penvern, Leyne Demoulin, Guillaume Pot, Joffrey Viguier, Benjamin Roux, Min Hu, Anders Olsson
{"title":"A laboratory method to determine 3D fibre orientation around knots in sawn timber: case study on a Douglas fir specimen","authors":"Helene Penvern, Leyne Demoulin, Guillaume Pot, Joffrey Viguier, Benjamin Roux, Min Hu, Anders Olsson","doi":"10.1007/s00226-024-01583-w","DOIUrl":"10.1007/s00226-024-01583-w","url":null,"abstract":"<div><p>The mechanical properties of structural timber largely depend on the occurrence of knots and on fibre deviation in their vicinities. In recent strength grading machines, lasers and cameras are used to detect surface characteristics such as the size and position of knots and local fibre orientation. Since laser dot scanning only gives reliable information about the fibre orientation in the plane of board surfaces, simple assumptions are usually made to define the inner fibre orientation to model timber boards. Those models would be improved by better insight into real fibre deviation around knots. In the present work, a laboratory method is developed to evaluate growth layers geometries and fibre orientation, solely based on the fact that the fibers are parallel to the tree rings and without any further assumptions. The method simply relies on color scans and laser dot scans of Douglas fir (<i>Pseudotsuga menziesii</i>) timber specimen sections revealed by successive planing. The proposed method provides data on fibre orientation in 3D with an accuracy that is relevant for the calibration of detailed models.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 5-6","pages":"1735 - 1760"},"PeriodicalIF":3.1,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00226-024-01583-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141921254","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}