An investigation of the dynamic response of architectural kerf structures

Shahid, Zaryab; Hubbard, James E.; Kalantar, Negar; Muliana, Anastasia

doi:10.1007/s00707-021-03108-z

Cited by 9 publications

(2 citation statements)

References 24 publications

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“…Another method of creating complex geometries out of rigid planar materials is called kerfing or relief cutting. Kerfing is a subtractive manufacturing process, which involves cutting or removing material to create locally flexible structures from relatively stiff planar mass-produced materials such as processed woods, metals, and alloys [7]. Wood and metal plates are capable of providing structural integrity but are relatively stiff making it difficult to mold them into complex shapes.…”

Section: Introductionmentioning

confidence: 99%

An exploration of 3D printed freeform kerf structures

Darnal

Poluri

Deshpande

et al. 2023

Behavior and Mechanics of Multifunctional Materials XVII

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This study presents the use of a 3D printing method to create kerf structures that can be formed into complex geometries. Kerfing is a subtractive manufacturing method to create flexible surfaces out of stiff planar materials such as metal or wood sheets by removing portions of the materials. The kerf structures are characterized by the kerf pattern, such as square interlocked Archimedean spiral and hexagon spiral domain, cell size, and cut density. By controlling the kerf pattern, spatial density, cell size, and material, the local properties of the structure can be controlled and optimized to achieve the desired local flexibility while minimizing the stresses developed in the kerf structure. Since subtractive manufacturing limits the patterns and materials that can be considered in kerf structures, FDM 3D printing is explored to fabricate kerf structures using polymers, such as Polylactic acid (PLA) and Thermoplastic polyurethane (TPU), where it is possible to vary microstructural topology and materials within the kerf structures. 3D printing enables the combination of the two different polymers and tuning printing factors to create multifunctional kerf structures. The multifunctional kerf structures can then be actuated using non-mechanical stimulations, such as thermal, to shape them into complex geometries.

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Section: Introductionmentioning

confidence: 99%

An exploration of 3D printed freeform kerf structures

Darnal

Poluri

Deshpande

et al. 2023

Behavior and Mechanics of Multifunctional Materials XVII

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“…Computerized numerical control (CNC) routing and laser cutting are two processing methods that can be used for obtaining geometric fretted patterns on thin decorative furniture panels [1], also for applications in 3D flexibilization of wood-based panels by means of kerf/cut through patterns [2][3][4][5]. In both cases, the cutting patterns imply that wood material (wood, plywood) is cut under different angles in relation to the grain, which can have a different impact on the surface quality [1, 6,7].…”

Section: Introductionmentioning

confidence: 99%

Comparative Surface Quality of Maple (Acer pseudoplatanus) Cut through by CNC Routing and by CO2 Laser at Different Angles as Related to the Wood Grain

et al. 2022

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The evaluation of surface quality is an important criterion to understand the effect of the cutting angle in relation to the grain and of the processing tool on wood. This paper examines, in a comparison, the surface quality of maple cut through by CNC and CO2 laser, for different angles with regard to the wood grain: 0°, 15°, 30°, 45°, 60°, 75°, and 90° and at different feed speeds of the CNC router: 2; 2.5; 3; 3.5 and 4 m/min. The direction of processing as related to the grain was a more significant factor in comparison with the feed speed when CNC was used, with best options for 0°, 90° and 75° and worst for 15°, where fuzzy grain was predominant, followed in order by 30°, 45°, and 60°, where pull-out material prevailed. The laser smoothed the core roughness, Rk, with no significant differences as related to the wood grain direction and enhanced an anatomical waviness earlywood-latewood, with the earlywood processed deeper. As the cutting advanced from along to across the grain, the laser uncovered more wood anatomical details and with less destruction. No significant differences in Rk between CNC cutting and laser processing were found for angles: 0°, 60°, and 75°, but surfaces processed at 15°, 30°, and 45° were significantly rougher in the case of CNC cutting. Comparative FTIR investigation of surfaces cut by laser and CNC (at 0° and 90°) clearly revealed temperature-induced chemical changes, such as hemicelluloses degradation, possibly demethylation and advanced condensation in the structure of lignin, in the case of laser processing.

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