Group B: Reliability Assessment of Multi-Member Structures

Bodig, Jozsef

doi:10.1007/978-94-015-8044-1_11

Cited by 3 publications

(4 citation statements)

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“…In the tangential direction, the partial crushing of earlywood cells results in compression failure, which continues along the tangential direction, and causes the buckling of the growth ring as shown in Figure d. The compressive behavior of the native wood as observed in this work is similar to that observed by Bodig and Jayne . Although the ammonia fumigation weakened the strength of wood perpendicular to the fiber direction (Figure S9 and S10), the mineral particles in the wood lumina have a strong stabilizing effect.…”

Section: Resultssupporting

confidence: 81%

Struvite Mineralized Wood as Sustainable Building Material: Mechanical and Combustion Behavior

Guo

Özparpucu

Windeisen‐Holzhauser

et al. 2020

ACS Sustainable Chem. Eng.

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A more extensive use of wood can reduce the environmental and climatic impact of the building industry. However, flammability limits the application of wood in multi-story and high rise timber buildings. Struvite mineralization has been shown to be a green solution for fire-resistant timber, but the influence of struvite minerals on the mechanical and gluing properties of wood as well as the combustion behavior have not been studied yet. In this work, we investigate the mechanical properties of mineralized wood by compression, bending, and tension tests as well as the gluing properties by tensile shear tests. Evolved gas analysis using GC/MSD system is applied to determine the thermal decomposition behavior of the mineralized wood, and Double shot analysis reveals volatile components of mineralized wood during the thermal decomposition process. The results show that the struvite mineralization treatment is a bulk modification technique that improves the fire resistance of wood. The mineralization can significantly influence the thermal decomposition behavior of wood, which results in an enhanced char formation. This char layer is a fire barrier that slows down the heat and oxygen penetration. The heat penetration rate of wood panels fabricated with mineralized wood is 0.6 mm/min during the cone calorimeter test, which is half of that of the wood panels fabricated with native wood. Transverse strength and stiffness under compression were improved, whereas mechanical loading in the longitudinal direction revealed similar or slightly decreased strength and stiffness. The mineralization had a minor impact on the gluing properties of solid wood. Wood mineralization by struvite may enable the more extensive use of wood in the construction sector as a substitute to less eco-friendly building materials.

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Section: Resultssupporting

confidence: 81%

Struvite Mineralized Wood as Sustainable Building Material: Mechanical and Combustion Behavior

Guo

Özparpucu

Windeisen‐Holzhauser

et al. 2020

ACS Sustainable Chem. Eng.

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“…By treating the MF as a laminate structure, with each ply as a cross-grained wood, and assuming no deformation mechanism effect from porosity, the effective modulus of holocellulose fibers can be estimated based on the following equations , where E MF is the MF longitudinal effective modulus, E L is the longitudinal fiber effective modulus, E T is the transverse fiber modulus (12 GPa), , and v is the Poisson ratio (0.47). , G is the shear modulus, which is calculated to be 6.1 GPa based on molded fibers with random-in-the-plane fiber orientation ( E random = 18 GPa) . Although the estimates for E T , v , and G can be debated, the approach is still helpful because E MF depends strongly on E L .…”

Section: Methodsmentioning

confidence: 99%

High-Density Molded Cellulose Fibers and Transparent Biocomposites Based on Oriented Holocellulose

Yang

Berthold²,

Berglund

2019

ACS Appl. Mater. Interfaces

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Ecofriendly materials based on well-preserved and nanostructured wood cellulose fibers are investigated for the purpose of load-bearing applications, where optical transmittance may be advantageous. Wood fibers are subjected to mild delignification, flow orientation, and hot-pressing to form an oriented material of low porosity. The biopolymer composition of the fibers is determined. Their morphology is studied by scanning electron microscopy, cellulose orientation is quantified by X-ray diffraction, and the effect of beating is investigated. Hot-pressed networks are impregnated by a methyl methacrylate monomer and polymerized to form thermoplastic wood fiber/poly(methyl methacrylate) biocomposites. Tensile tests are performed, as well as optical transmittance measurements. Structure–property relationships are discussed. High-density molded fibers from holocellulose have mechanical properties comparable with nanocellulose materials and are recyclable. The thermoplastic matrix biocomposites showed superior mechanical properties (Young’s modulus of 20 GPa and ultimate strength of 310 MPa) at a fiber volume fraction of 52%, with high optical transmittance of 90%. The study presents a scalable approach for strong, stiff, and transparent molded fibers/biocomposites.

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“…In this review, the wood structure is discussed, focusing on the types and sources of variability. For more details on the structure, chemistry, and associated properties and functions of wood, the reader is referred to dedicated textbooks. − …”

Section: The Chemical and Structural Complexity Of Woodmentioning

confidence: 99%

Section: The Chemical and Structural Complexity Of Woodmentioning

confidence: 99%

Sustainability in Wood Products: A New Perspective for Handling Natural Diversity

2022

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Wood is a renewable resource with excellent qualities and the potential to become a key element of a future bioeconomy. The increasing environmental awareness and drive to achieve sustainability is leading to a resurgence of research on wood materials. Nevertheless, the global climate changes and associated consequences will soon challenge the wood-value chains in several regions (e.g., central Europe). To cope with these challenges, it is necessary to rethink the current practice of wood sourcing and transformation. The goal of this review is to address the intrinsic natural diversity of wood, from its origin to its technological consequences for the present and future manufacturing of wood products. So far, industrial processes have been optimized to repress the variability of wood properties, enabling more efficient processing and production of reliable products. However, the need to preserve biodiversity and the impact of climate change on forests call for new wood processing techniques and green chemistry protocols for wood modification as enabling factors necessary for managing a more diverse wood provision in the future. This article discusses the past developments that have resulted in the current wood value chains and provides a perspective about how natural variability could be turned into an asset for making truly sustainable wood products. After briefly introducing the chemical and structural complexity of wood, the methods conventionally adopted for industrial homogenization and modification of wood are discussed in relation to their evolution toward increased sustainability. Finally, a perspective is given on technological potentials of machine learning techniques and of novel functional wood materials. Here the main message is that through a combination of sustainable forestry, adherence to green chemistry principles and adapted processes based on machine learning, the wood industry could not only overcome current challenges but also thrive in the near future despite the awaiting challenges.

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Group B: Reliability Assessment of Multi-Member Structures

Cited by 3 publications

References 0 publications

Struvite Mineralized Wood as Sustainable Building Material: Mechanical and Combustion Behavior

Struvite Mineralized Wood as Sustainable Building Material: Mechanical and Combustion Behavior

High-Density Molded Cellulose Fibers and Transparent Biocomposites Based on Oriented Holocellulose

Sustainability in Wood Products: A New Perspective for Handling Natural Diversity

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