Mechanical behaviour of gel-filled additively-manufactured lattice structures under quasi-static compressive loading

Materials Today Communications, Journal Year: 2023, Volume and Issue: 35, P. 106164 - 106164

Published: May 9, 2023

The worldwide incidence of traumatic brain injuries (TBIs) is on the rise. Helmets are one best technologies available to prevent TBIs from impacts head during recreational and occupational activities. most commonly used material for helmet liners expanded polystyrene (EPS) foam. However, while EPS can reduce linear accelerations impacts, it does not perform as well at reducing rotational which considered be harmful tissue. Recently, prismatic lattice structures have shown promise in these accelerations. Here, a new structure energy dissipation applications presented that hypothesised improve by filling with gel. To test this hypothesis, 3D printed lattices fabricated PLA, PET-G, ABS were filled 5 wt% 10 agar tested failure under quasi-static compression. Compared unfilled control group, was found PLA had performance demonstrating 46.1% increase absorbed 57.4% displacement failure. These results demonstrate superior properties gel-filled compared

Language: Английский

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Additive manufacturing of functionally graded foams: Material extrusion process design, part design, and mechanical testing

Additive manufacturing, Journal Year: 2023, Volume and Issue: 79, P. 103945 - 103945

Published: Dec. 24, 2023

Language: Английский

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Defect sensitivity mitigation in the compressive mechanical response of two-phase lattice metamaterials

Composite Structures, Journal Year: 2023, Volume and Issue: 323, P. 117501 - 117501

Published: Aug. 22, 2023

Engineered materials commonly referred to as metamaterials are that offer appealing features such customizable stiffness and strength, auxetic behavior energy absorption. This work focuses on the classical 2D lattice metamaterial configuration with regular triangular unit cell. A combination of two dissimilar is employed in design process: primary material constitutes structure composed thermoplastic polyurethane (TPU), while an incompressible silicone serves secondary material, completely filling selected cells. In order investigate mechanical response lattices intrinsic defects, geometric imperfections intentionally introduced. Three distinct types anomalies, i.e.curvature some elements, lateral shift nodes, reduced beam thickness, randomly Additively manufactured perfect defective subjected compressive loading for both empty filled cases. Overall, results reveal show a significant improvement assumed reinforcing pattern, helping prevent buckling beams under compression enhancing load bearing capacity at higher deformations. Finite element (FE) analyses performed validate experimental results, demonstrating how pattern enhances lattices.

Language: Английский

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Material extrusion of quaternary co-continuous biopolymers: A strategy for realizing lightweight cellular solids with high impact toughness

Additive manufacturing, Journal Year: 2023, Volume and Issue: 77, P. 103805 - 103805

Published: Sept. 1, 2023

Language: Английский

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Computer-Aided Optimisation in Additive Manufacturing Processes: A State of the Art Survey

Journal of Manufacturing and Materials Processing, Journal Year: 2024, Volume and Issue: 8(2), P. 76 - 76

Published: April 15, 2024

Additive manufacturing (AM) is a field with both industrial and academic significance. Computer-aided optimisation has brought advances to this over the years, but challenges areas of improvement still remain. Design execution inaccuracies, void formation, material anisotropy, surface quality are examples remaining challenges. These can be improved via some trending topics, such as artificial intelligence (AI) machine learning (ML); STL correction, replacement, or removal; slicing algorithms; simulations. This paper reviews AM its history special focus on printing process how it optimised using computer software. The most important new contribution survey present connected prevailing topics. seen foundation for future research. In addition, we suggest certain show changes affect process.

Language: Английский

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Research on Auxetic Lattice Structure for Impact Absorption in Machines and Mechanisms

Mathematics, Journal Year: 2024, Volume and Issue: 12(13), P. 1983 - 1983

Published: June 27, 2024

In this paper, a new type of filled doubly re-entrant auxetic lattice structure for application in damping and energy absorption devices is considered. The modeled to give protection machines mechanisms intensive impact. suggested the modified version one with silicone fillings. unit assumed as hexagon four quadrangular absorbers. For model unit, deformation properties Poisson’s ratio were computed. obtained results experimentally tested. Specimens unfilled structures investigated under quasi-static compression. measured show that dissipation more than two times higher ones. structure, absorber’s rigidity has crucial role. If small, absorber, inside continues deform from rectangle into rhomboid. Otherwise, if high, units absorbers form beam-like buckles shows high effect. are good agreement theoretical

Language: Английский

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Additive manufactured enabled digital metallurgy processes, challenges and future prospects

Applied Materials Today, Journal Year: 2024, Volume and Issue: 42, P. 102580 - 102580

Published: Dec. 31, 2024

Language: Английский

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Role of Additive Manufacturing in Sustainability and Circular Economy of Growing Emerging Economies: A Case Study of India, Indonesia, and Saudi Arabia

Published: Jan. 1, 2024

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Language: Английский

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Comparative analysis of specimen geometries in material extrusion 3D printing: Implications for mechanical property evaluation

Journal of Applied Polymer Science, Journal Year: 2023, Volume and Issue: 141(6)

Published: Dec. 2, 2023

Abstract This study investigated the influence of specimen geometry on mechanical properties 3D‐printed parts by material extrusion (MEX). Four widely used technical standards were evaluated (ASTM D638, ASTM D3039/D3039M‐14, ISO 527/2, and 37), all possible geometries tested. The specimens subjected to uniaxial tensile loading using a universal testing machine obtain ultimate strength, yield Young modulus. Mean, , values, as well (number tested reach at least 10 valid data) are geometry‐dependent. A critical analysis these data allowed proposing standard evaluation index () (standard) based variance test efficiency achieve data. results indicate that D638 performed better than any other standard. For investigations involving strength Types I II D638) most recommended for 3D MEX printing because it combines lowest with minimum . By following it, researchers suppliers can ensure accurate reliable assessments parts, contributing increased safety, reliability, quality in additive manufacturing. Notes: – Material Extrusion, American Society Testing Materials, International Organization Standardization, SD Standard Deviation, CV Coefficient Variation, Number data, Evaluation Index.

Language: Английский

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Additive manufacturing of biphasic architectured structure and analysis of its mechanical and functional response

The International Journal of Advanced Manufacturing Technology, Journal Year: 2024, Volume and Issue: 135(5-6), P. 2065 - 2085

Published: Oct. 15, 2024

Language: Английский

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