Multiscale modeling of environment-dependent heterogeneous media by a Thermo-Hydro-mechanical damage model

International Journal of Mechanical Sciences, Journal Year: 2024, Volume and Issue: 273, P. 109218 - 109218

Published: March 23, 2024

Language: Английский

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Towards defect-free lattice structures in additive manufacturing: A holistic review of machine learning advancements

Journal of Manufacturing Processes, Journal Year: 2025, Volume and Issue: 144, P. 1 - 53

Published: April 15, 2025

Language: Английский

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Embedding lattice structures into ship hulls for structural optimization and additive manufacturing

Ocean Engineering, Journal Year: 2024, Volume and Issue: 301, P. 117601 - 117601

Published: March 25, 2024

Language: Английский

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Mechanical and microstructural characterization of Ti6Al4V lattice structures with and without solid shell manufactured via electron beam powder bed fusion

The International Journal of Advanced Manufacturing Technology, Journal Year: 2024, Volume and Issue: 131(3-4), P. 1289 - 1301

Published: Feb. 6, 2024

Abstract The topological optimization of components by means lattice structures allows to reduce their weight avoiding a loss in the mechanical performance. Often parts are integrated more complex geometry, and they present an interface with solid part. In paper, microstructural characterization Ti6Al4V body-centered cubic unit cell was carried out. Samples without external shell were designed produced electron beam powder bed fusion order investigate behavior these structures, especially at between parts. microstructure defects analyzed, compression tests performed on samples understand influence part its interaction structure. After fracture detachment shell, same for both set observed. Finally, finite element model defined better investigated structures. nominal sample stiffness significantly higher than experimental one. This discrepancy can be attributed local defects, terms porosities deviations from ideal geometry.

Language: Английский

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Exploring novel mechanical metamaterials: Unravelling deformation mode coupling and size effects through second-order computational homogenisation

International Journal of Solids and Structures, Journal Year: 2024, Volume and Issue: 292, P. 112724 - 112724

Published: Feb. 23, 2024

Architected materials and mechanical metamaterials are known for their unique macroscopic properties complex behaviour that often defy conventional continuum mechanics. Therefore, in this contribution, a recent multi-scale second-order computational homogenisation method (Dos Santos et al., 2023) is employed to explore these under finite strains. The approach combines second gradient theory at the macro-scale representative volume element (RVE) with classical first-order mechanics micro-scale. Method of Multi-scale Virtual Power ensures consistent scale transition. predictive capability applicability strategy evaluated through coupled numerical simulations. These simulations involve two- three-dimensional problems, strong focus on development novel metamaterials, while also accounting diverse loading conditions, such as tension/compression-induced undulation, bending, compression-induced torsion. Comparisons Direct Numerical Simulations validate approach. Analysis homogenised tangents reveals valuable insights into properties. Overall, results highlight capture significant phenomena, including deformation modes, coupling mechanisms, size effects.

Language: Английский

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Effects of different cross-sections of Body Centered Cubic cells on pressure drop and heat transfer of additively manufactured heat sinks

International Journal of Heat and Mass Transfer, Journal Year: 2024, Volume and Issue: 222, P. 125170 - 125170

Published: Jan. 5, 2024

In many industrial applications, heat loads management requires the design and production of compact exchangers which are expected to handle high thermal with acceptable pressure losses, while assuring good mechanical performances. These challenging targets can be achieved by filling cavities where cool/hot fluid circulates lattice structures promoting exchange between cavity boundaries. Such only produced through Additive Manufacturing due their geometric complexity. Recent experimental investigations proved effectiveness some kinds having a circular cross section. Here aerothermal behaviour Body-Centred Cubic (BCC) stagger arrays in rectangular channel was experimentally investigated considerably extending previous studies higher Reynolds numbers (up 30′000) new types structures. Specifically, three BCC cam-like, drop-like elliptical section were explored this work compared against those All samples manufactured means Laser Powder Bed Fusion made from AlSi10Mg. At first, comprehensively characterized optical non-destructive methods. Successively they tested dedicated rig imposing constant flux boundary conditions. The characteristics transitional or fully turbulent approaching flow test also reported thanks field measurements performed Particle Image Velocimetry. According obtained results, structure larger diameter is most effective terms transfer, although it largely penalized losses. Similar transfer performances tapered shape advantage lower friction factor. Pressure losses resulted almost identical for all sections but than one an equal frontal dimension. When considering performance factor becomes unfavourable Re>20′000, best choice efficiently promote up Re=30′000.

Language: Английский

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Thermo-mechanical modeling of lattice-core sandwich panels in powder bed fusion

International Journal of Mechanical Sciences, Journal Year: 2024, Volume and Issue: 273, P. 109243 - 109243

Published: March 28, 2024

Language: Английский

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Innovative Cellular Insulation Barrier on the Basis of Voronoi Tessellation—Influence of Internal Structure Optimization on Thermal Performance

Materials, Journal Year: 2024, Volume and Issue: 17(7), P. 1578 - 1578

Published: March 29, 2024

The optimization of structure and thermal properties in 3D-printed insulation materials remains an underexplored area the literature. This study aims to address this gap by investigating impact 3D printing on manufactured cellular composites. studied were closed-cell foams with a complex cell based Voronoi model, using incremental technology (3D printing). influence composite, type material used, number layers composite its properties, i.e., conductivity coefficient, resistance, coefficient heat transfer, was analyzed. Samples different types thermosetting resins, characterized values emissivity It shown that both material, pores significantly affect insulating properties. Thermal permeability depended decreased up 30% as increased from one four, while resistance 35%. results indicate is key regulating conduction. Controlling cells given volume (and thus size air cells) can be effective tool designing high performance. Among prototype composites produced, best performance metalized four-layer (λ = 0.035 ± 0.002 W/m·K, Rc 1.15 0.02 K·m2/W, U 0.76 0.01 W/m2·K).

Language: Английский

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Effect of Printing Orientation on the Mechanical Properties of 3D-Printed Cu–10Sn Alloys by Laser Powder Bed Fusion Technology

Metals, Journal Year: 2024, Volume and Issue: 14(6), P. 660 - 660

Published: June 1, 2024

This article focuses on investigating the effect of printing direction mechanical properties Cu–10Sn alloys prepared by laser powder bed fusion (LPBF) technology. Specimens with different forming angles (0°, 15°, 30°, 45°, 60°, 75°, and 90°) were fabricated using LPBF technology, their systematically tested. During testing process, we used an Instron 5985 electronic universal material machine to accurately evaluate at a constant strain rate 10−3/s. The experimental results showed that specimens best when test was perpendicular growth (i.e., 0° direction). As angle between increased, exhibited trend first decreasing, then increasing, decreasing again, which consistent microtexture specimens. root cause this lies in significant change stress borne columnar crystals under load directions. Specifically, as gradually transitions from being parallel them, also shifts radial axial direction. Due differences number strength grain boundaries directions, directly leads changes properties. In particular, specimen is loaded crystals, boundary density higher, these provide greater resistance during dislocation migration, thus significantly hindering tensile deformation enabling exhibit superior Among all tested angles, properties, 723 MPa, yield 386 elongation 33%. contrast, 90° performed worst terms These findings important insights for us deeply understand LPBF.

Language: Английский

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Data-driven inverse design of composite triangular lattice structures

International Journal of Mechanical Sciences, Journal Year: 2023, Volume and Issue: 265, P. 108900 - 108900

Published: Nov. 29, 2023

Language: Английский

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