Bibliografie tematiche / Assembly by densified dowels

Letteratura scientifica selezionata sul tema "Assembly by densified dowels"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Assembly by densified dowels":

Han, Lei, Andreja Kutnar, Jakub Sandak, Iztok Šušteršič e Dick Sandberg. "Adhesive- and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors". Forests 14, n. 2 (5 febbraio 2023): 311. http://dx.doi.org/10.3390/f14020311.

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Engineered wood products (EWPs) are being increasingly used as construction materials. EWPs are currently being made using synthetic adhesives or metal fasteners, which lead to poor recyclability and reusability. Therefore, this review paper focused on emerging adhesive- and metal-free assembling techniques including wood dowels, rotary-dowel welding, wooden nails, and dovetail joining as alternative ways of making prefabricated EWPs. This will contribute towards green construction and optimising the building process to minimise its negative impact on the environment and its inhabitants, while maximising the positive aspects of the finished structure. The respective advantages and shortcomings will be compared with those of equivalent EWPs. In general, the dowel-laminated timber (DLT) provides sufficient load-bearing capacity and even better ductility than EWPs of equivalent size, but its relatively low stiffness under a bending load limits its application as a structural element. Optimised manufacturing parameters such as dowel species, dowel spacing, dowel diameter, dowel insertion angle, dowel shape, etc. could be studied to improve the stiffness. The improved mechanical properties and tight fitting due to set-recovery of densified wood support its use as sustainable alternatives to hardwood dowels in DLT to overcome problems such as the loosening of connections over time and dimensional instability. The rotary welding technology could also enhance the strength and long-term performance of dowel-type joints, but its poor water resistance needs further investigation. The main obstacles to implementing DLT products in the market are missing technical information and design guidelines based on national codes.

Riggio, Mariapaola, Dusan Pauliny, Jakub Sandak e Anna Sandak. "Novel Nail-Like Wood Connectors". Advanced Materials Research 778 (settembre 2013): 647–54. http://dx.doi.org/10.4028/www.scientific.net/amr.778.647.

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In traditional timber structures, hardwood connectors such as a nails, wedges, dowels and pegs have been used as reinforcement of carpentry joints or to fix wooden ceiling matts or floor boards. In the study reported, the possibility to rely on enhanced mechanical and technological properties of densified wood, for the production of wooden nails to be used in the repair of traditional timber structures is discussed. The wood used for connectors were domestic wood species; ash, beech, black locust and poplar. Wooden blocks were exposed to densification procedure with the purpose of increasing the materials density, dimensional stability and possibly, improve durability and selected mechanical properties. The densification ratio varied between 50 and 67%. A dedicated research has been performed in order to determine the effect of densification on the compression behavior of wood in the form of nails. The progress of pushing force during insertion of the wooden nails into wood samples was also monitored and served for insertion process control. A preliminary series of push-out tests have been carried out on timber-to-timber joints assembled with the densified nails.The results obtained show potential for using the novel wooden nail connectors for substitution or integration repair works in traditional timber systems.

Guan, Z. W., e P. D. Rodd. "A three-dimensional finite element model for locally reinforced timber joints made with hollow dowel fasteners". Canadian Journal of Civil Engineering 27, n. 4 (1 agosto 2000): 785–97. http://dx.doi.org/10.1139/l00-018.

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Brittle premature failure caused by splitting parallel to the timber grain is a common failure mode in glulam joints made with solid dowel type fasteners. It is thought that this problem can be alleviated by using hollow steel dowels as the fasteners and reinforcing the timber locally in the area of the joint. In this way, by varying the wall thickness of the dowels and the thickness of the reinforcing members, a chosen combination of strength and stiffness should be attainable together with a ductile failure mode. In this paper, three-dimensional nonlinear finite element models are developed to simulate (i) the structural performance of a timber joint made with a single hollow steel dowel and (ii) a moment transmitting joint made with a number of the dowels, each type being locally reinforced by densified veneer wood. The models incorporate suitably defined elastoplasticity and orthotropic elasticity and also allow for large deformations of the joints as well as for frictional contact between the timber and the dowel. They are calibrated against physical test data from joints loaded to failure.Key words: glulam, densified veneer wood, resin injected, hollow dowel fastener, moment transmitting, ductile failure, finite element.

Grönquist, Philippe, Thomas Schnider, Andreas Thoma, Fabio Gramazio, Matthias Kohler, Ingo Burgert e Markus Rüggeberg. "Investigations on densified beech wood for application as a swelling dowel in timber joints". Holzforschung 73, n. 6 (26 giugno 2019): 559–68. http://dx.doi.org/10.1515/hf-2018-0106.

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AbstractFor robotic fabrication of wooden structures, the simple, quick and tight joining of elements can be solved using swelling hardwood dowels. This topic has been the focus of the present study, and the set-recovery capacity of densified wood (dW) as dowel material was investigated. European beech was compressed in the radial direction at 103°C and 10% moisture content (MC) to a compression ratio of 40%. Multiple swelling and shrinkage cycles were applied to measure swelling behavior, swelling pressure development and combined swelling and creep under compressive loading. It has been demonstrated that dW shows increased swelling and more persisting swelling pressures than native wood (nW). The set-recovery prevents significant contact-stress relaxation over multiple cycles of MC change. Application as a structural joining element for robotic fabrication was studied by shear lap joint tests on round double-dovetail swelling dowels.

Ercan, Ersin, Kadir Aydin, Cansu Özder e Musa Atar. "The effect of the densification process on dowel tensile performance with different types of glues". Folia Forestalia Polonica 64, n. 4 (1 dicembre 2022): 214–25. http://dx.doi.org/10.2478/ffp-2022-0021.

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Abstract This study was performed to determine the effects of the densification process and glue type in wood material on dowel tensile performance. For this purpose, 8 mm and 10 mm diameter dowels were obtained from black poplar (Populus nigra) and Eastern spruce (Picea orientalis L.), which were densified at 50% and 75% ratios. The dowels were bonded with PVAc and D-VTKA glue separately after drilling 18 mm deep holes in the edge of the melamine-coated particleboard. The tensile performance test was determined with the Universal test device according to TS 2475 and ASTM-D 1035 principles. As a result, Eastern spruce wood had the highest tensile performance (kg/cm2), and poplar wood had the lowest (173.66). For the dowel diameter parameter, the highest value (195.11) was found at 8 mm in diameter and the lowest value (161.05) was found at 10 mm in diameter. In terms of glue type, the highest value (185.92) was seen at PVAc while the lowest value (170.24) was seen at D-VTKA. And for the densification ratios, the highest value (191.4) was determined at 75%, while the lowest value was found in control samples at (167.4). According to the wood species, densification ratio, dowel diameter and glue type interaction, the highest value was determined at Es + d75% + 10mm + PVAc as (303.5) and the lowest value was found at P + d50% + 10mm + Dv as (110). As a result, where the dowel's high tensile performance is sought, using a 10 mm diameter dowel made from 75% densified spruce wood with PVAc glue may be advantageous.

Kasal, Ali, Jerzy Smardzewski, Tolga Kuşkun e Ersan Güray. "Analyses of L-Type Corner Joints Connected with Auxetic Dowels for Case Furniture". Materials 16, n. 13 (23 giugno 2023): 4547. http://dx.doi.org/10.3390/ma16134547.

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Tests were carried out to develop and manufacture various types of auxetic dowels using 3D printing technology. These dowels were then used to connect L-type corner joint specimens for case furniture, and their strength and stiffness were analyzed through experimental, theoretical, and numerical means. In the scope of the study, eight different types of auxetic dowels including two inclusion types, two inclusion sizes, and two dowel hole diameters, as well as a reference non-auxetic dowel, were designed. Accordingly, a total of 180 specimens that included 10 replications for each group were tested; 90 were tested under tension and the remaining 90 were tested under compression. The results demonstrated that the assembly force required for the corner joints connected with auxetic dowels was significantly lower compared to non-auxetic dowels. Furthermore, the numerical and theoretical analyses yielded similar outcomes in this study. Both analyses revealed that the dowels used to connect the corner joints experienced substantial stresses during mounting and bending, ultimately leading to their failure. Upon concluding the test results, it was observed that the corner joints connected with dowels featuring rectangular inclusions exhibited superior performance when compared to those with triangular inclusions. In light of these findings, it can be concluded that further enhancements are necessary for auxetic dowels with rectangular inclusions before they can be utilized as alternative fasteners for traditional dowels.

O'Ceallaigh, Conan, Michael Conway, Sameer Mehra e Annette M. Harte. "Numerical Investigation of Reinforcement of Timber Elements in Compression Perpendicular to the Grain using Densified Wood Dowels". Construction and Building Materials 288 (giugno 2021): 122990. http://dx.doi.org/10.1016/j.conbuildmat.2021.122990.

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Bocquet, J. F., A. Pizzi e L. Resch. "Full-scale industrial wood floor assembly and structures by welded-through dowels". Holz als Roh- und Werkstoff 65, n. 2 (6 febbraio 2007): 149–55. http://dx.doi.org/10.1007/s00107-006-0170-4.

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Pakuła, Weronika, Barbara Prałat, Zbigniew Potok, Krzysztof Wiaderek e Tomasz Rogoziński. "Energy Consumption for Furniture Joints during Drilling in Birch Plywood". Polymers 16, n. 8 (10 aprile 2024): 1045. http://dx.doi.org/10.3390/polym16081045.

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The purpose of this study is to support eco-design ideas and sustainable manufacturing techniques by examining the energy consumption related to drilling holes for different furniture connections. The experimental model is a simple piece of furniture made from birch plywood with three different types of joints. Eccentric joints, confirmat screws, and dowel measurements of energy consumption with a CNC drilling and milling machine show different values for every kind of connector. The energy consumption was measured using a portable power quality analyzer, specifically the PQ-box 150 manufactured by A:Eberle GmbH & Co. KG Nürnberg, Germany. This device likely adheres to industry standards for energy measurement, ensuring accurate and reliable results. The measurement process involved recording energy consumption at different stages of the machining process, allowing for the analysis of specific cutting work and total energy consumption for various joint types. Dowels exhibit the lowest energy consumption at 0.105 Wh for one furniture joint, confirmat screws at 0.127 Wh, while eccentric joints, despite their higher energy consumption (0.173 Wh), offer enhanced transportability and assembly flexibility of a piece of furniture. Specific cutting power for one selected piece of furniture was 227.89 J/mm3 for dowels, 190.63 J/mm3 for eccentric joints and 261.68 J/mm3 for confirmat screws.

Rezabeigi, Ehsan, Gabriele Griffanti e Showan N. Nazhat. "Effect of Fibrillization pH on Gelation Viscoelasticity and Properties of Biofabricated Dense Collagen Matrices via Gel Aspiration-Ejection". International Journal of Molecular Sciences 24, n. 4 (15 febbraio 2023): 3889. http://dx.doi.org/10.3390/ijms24043889.

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Reconstituted hydrogels based on the self-assembly of acid-solubilized collagen molecules have been extensively used as in vitro models and precursors in biofabrication processes. This study investigated the effect of fibrillization pH—ranging from 4 to 11—on real-time rheological property changes during the gelation of collagen hydrogels and its interplay with the properties of subsequently biofabricated dense collagen matrices generated via automated gel aspiration-ejection (GAE). A contactless, nondestructive technique was used to characterize the temporal progression in shear storage modulus (G’, or stiffness) during collagen gelation. There was a relative increase in G′ of the hydrogels from 36 to 900 Pa with an increase in gelation pH. Automated GAE, which simultaneously imparts collagen fibrillar compaction and alignment, was then applied to these precursor collagen hydrogels to biofabricate native extracellular matrix-like densified gels. In line with viscoelastic properties, only hydrogels fibrillized in the 6.5 < pH ≤ 10 range could be densified via GAE. There was an increase in both fibrillar density and alignment in the GAE-derived matrices with an increase in gelation pH. These factors, combined with a higher G′ in the alkaline precursor hydrogels, led to a significant increase in the micro-compressive modulus of GAE-densified gels of pH 9 and 10. Furthermore, NIH/3T3 fibroblast-seeded GAE-derived matrices densified from gels fibrillized in the pH range of 7 to 10 exhibited low cell mortality with >80% viability. It is anticipated that the results of this study can be potentially applicable to other hydrogel systems, as well as biofabrication techniques involving needles or nozzles, such as injection and bioprinting.

Più fonti

Tesi sul tema "Assembly by densified dowels":

Tran, Trong Tuan. "Comportement au feu des structures bois assemblées par des tourillons en bois densifié". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0298.

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Dans le cadre d’un projet européen, un nouvel assemblage par tourillons densifiés permettant de maintenir des lamelles en bois est en cours de validation au niveau structurel. Ce type d’assemblage possède l’avantage de ne pas utiliser de colles et de permettre de fabriquer des structures de grandes dimensions ne comportant que du bois. Le principe consiste à mettre en place les planches de bois comme souhaité, puis à percer et introduire des tourillons densifiés : sous l’effet de la reprise d’humidité, les tourillons densifiés gonflent et bloquent l’assemblage, rendant la structure rigide. L’utilisation de ce type d’assemblages nécessite une multitude de vérifications de dimensionnement et de comportement à des sollicitations diverses dont les variations thermomécaniques. Ainsi, dans le cadre de ce travail de thèse, l’objectif sera de caractériser le comportement des assemblages lamelles de bois par tourillons densifiées soumises à des contraintes thermo-hydriques importantes, notamment lors d’incendie. Pour ce faire, nous proposons une approche couplée par expérimentations et par modélisation numérique. Les expérimentations permettront dans un premier temps d’acquérir les données de base pour développer le modèle. La modélisation numérique permettra ensuite de mieux comprendre les mécanismes mis en jeu lors de l’incendie de ces types de structures pour en améliorer les performances. Cela permettra en outre de réduire le nombre d’essais couteux. Le modèle sera validé par des mesures de températures à différentes profondeurs dans la section des lamelles, mais aussi au sein des tourillons densifiés. Ces résultats seront alors confrontés à des essais expérimentaux pour validation sur quelques essais au feu en sollicitations mécaniques. Ce modèle pourra alors être utilisé pour estimer le comportement de structures plus complexes soumises à un incendie et fournir des données de base pour le dimensionnement de bâtiments complets. Les résultats pourront également servir de base pour amender les textes réglementaires tels que l’Eurocode 5
As part of a European project, a new assembly using densified dowels to hold wooden slats is currently being validated at the structural level. This type of assembly has the advantage of not using glues and of making it possible to manufacture large-sized structures consisting only of wood. The principle consists of positioning the wooden planks as desired, then drilling and inserting densified dowels: under the effect of moisture absorption, the densified dowels swell and block the assembly, making the structure rigid.The use of this type of assembly requires a multitude of sizing and behavior checks under various stresses, including thermomechanical variations. Thus, within the framework of this thesis work, the objective will be to characterize the behavior of wood lamellar assemblies by densified dowels subjected to significant thermo-hydric stresses, in particular during the fire. To do this, we propose an approach coupled with experiments and numerical modeling. The experiments will first allow the acquisition of the basic data to develop the model. Numerical modeling will then make it possible to better understand the mechanisms involved in the fire of these types of structures in order to improve their performance. This will also reduce the number of expensive trials. The model will be validated by temperature measurements at different depths in the section of the lamellae, but also within the densified dowels. These results will then be compared to experimental tests for validation on a few fire tests under mechanical stress.This model can then be used to estimate the behavior of more complex structures subjected to fire and to provide basic data for the sizing of complete buildings. The results can also serve as a basis for amending regulatory texts such as Eurocode 5

Atti di convegni sul tema "Assembly by densified dowels":

Shi, Li, Libin Sun, Zonggang Wang, Yuqin Hu e Zhensheng Zhang. "Graphite Component Testing on the Load Capacity of the Dowel-Brick Structure in HTR-PM". In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icone20-power2012-54945.

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Graphite core components which form the moderator and reflector structures in High Temperature Reactor Pebble bed Module (HTR-PM) are subjected to various kinds of loads. Graphite keys and dowels are designed to maintain the structure integration and dimension stability of the graphite assembly during the operation of the plant. The dowel-brick structures bear the shear loads between different layers of the graphite bricks. Experiments have been carried out to study the shear load capacity of the graphite dowel and dowel-brick structure. The load-displacement curves and the failure modes were obtained for different dowels used in HTR-PM. The results show that for a dowel-brick structure subjected to lateral load, graphite brick failed first with cracks initiated around the dowel socket. The load capacity of the dowel-brick structure is lower than that of the dowel itself. The shear stiffness of the dowel-brick structure was obtained to calculate the relative displacement of adjacent graphite bricks connected by dowels.

Boli, Gotre Bi Djeli Bienvenu, Marc Oudjene, Daniel Coutellier e Hakim Naceur. "FINITE ELEMENT MODELLING OF HYBRID WOOD/ALUMINIUM ASSEMBLY WITH WOOD-FILLED ALUMINIUM AND STEEL DOWELS". In World Conference on Timber Engineering 2023 (WCTE2023). As, Norway: World Conference on Timber Engineering (WCTE 2023), 2023. http://dx.doi.org/10.52202/069179-0415.

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Lai, Shigang, Libin Sun, Li Shi e Zhengming Zhang. "Seismic Test on Double-Layer Model of HTR-PM Graphite Structure". In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30600.

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The HTR-PM (High Temperature Reactor Pebble bed Module) reactor core consists of assemblies that include graphite bricks, carbon bricks and keys/dowels. The double-layer structure, which is composed of two layers of bricks connected by keys and dowels, is the basic load-bearing unit of the graphite internals. A series of seismic experiments have been carried out to study the dynamic characteristic of this multi-body structure. As a part of them, the present study aimed to evaluate the nonlinear dynamic response of a full-size graphite/carbon unit and investigate the integrity of this assembly. Dynamic excitations were applied at the bottom of the double-layer structure. The experimental random-motion excitation ranged from 0.2g to 0.75g. The sine-sweep excitation frequency band ranged from 5–100Hz, sweep rate was 1oct/min, with acceleration magnitudes of 0.3g and 0.5g. The sine beat wave excitation frequencies were 5Hz, 10Hz, 20Hz and 40Hz with acceleration of 0.5g. Response data of acceleration and displacement at certain points on bricks were measured. PSD curves and displacement time-histories were acquired. Results indicated that the fundamental frequency of the assembly is 42∼49Hz and the damping rate is 4.9%. The dynamic response of the assembly exhibited as an integrated component only when the excitation is lower than 0.35g.

Schweigler, Michael, Romain Lemaître, Zijad Shehadeh e Thomas K. Bader. "MOISTURE AND ASSEMBLY HISTORY EFFECTS ON EMBEDMENT PROPERTIES OF STEEL DOWELS IN SPRUCE AND BIRCH LOADED IN GRAIN DIRECTION". In World Conference on Timber Engineering 2023 (WCTE2023). As, Norway: World Conference on Timber Engineering (WCTE 2023), 2023. http://dx.doi.org/10.52202/069179-0157.

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Zhang, Mei, Shaoli Fang, Anvar A. Zakhidov, Sergey B. Lee, Ali E. Aliev, Christopher D. Williams, Ken R. Atkinson e Ray H. Baughman. "Flipping Carbon Nanotubes to Continuously Produce Strong, Transparent, Multifunctional Sheets". In ASME 4th Integrated Nanosystems Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/nano2005-87091.

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We demonstrate carbon nanotube assembly by cooperatively rotating carbon nanotubes in vertically-oriented nanotube arrays (forests) and make 5-centimeter-wide, meter-long transparent sheets. These self-supporting nanotube sheets are initially formed as a highly anisotropic electronically conducting aerogel that can be densified into strong sheets that are as thin as 50 nanometers. The measured gravimetric strength of orthogonally oriented sheet arrays exceeds that of high strength steel sheet.