Design and additive manufacturing of novel hybrid lattice metamaterial for enhanced energy absorption and structural stability

Materials & Design, Journal Year: 2024, Volume and Issue: 245, P. 113268 - 113268

Published: Aug. 23, 2024

Language: Английский

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Topologically Optimized Anthropomorphic Prosthetic Limb: Finite Element Analysis and Mechanical Evaluation Using Plantogram-Derived Foot Pressure Data

Biomimetics, Journal Year: 2025, Volume and Issue: 10(5), P. 261 - 261

Published: April 24, 2025

The development of prosthetic limbs has benefited individuals who suffered amputations due to accidents or medical conditions. During the conventional prosthetics, several challenges have been observed regarding functional limitations, restricted degrees freedom compared an actual human limb, and biocompatibility issues between surface limb tissue skin. These could result in mobility impairments failed mimicry stress distribution, causing discomfort, chronic pain, damage possible infections. Especially cases where underlying conditions exist, such as diabetes, trauma, vascular disease, a adaptation lead complete abandonment part. To address these challenges, insertion topologically optimized parts with biomimetic approach allowed optimization complex functionality behavior natural body parts, allowing lightweight efficient anthropomorphic structures. This results unified minimizing practical limitations while also adding aesthetic that aids reducing any symptoms related social anxiety impaired functioning. In this paper, novel designed foot Thermoplastic Polyurethane-based composite (TPU-Ground Tire Rubber 10 wt.%) was studied. final designs contain advanced sustainable polymeric materials, gyroid lattice geometries, Finite Element Analysis (FEA) for performance optimization. Initially, static evaluation conducted replicate phenomena at standing process replicated above-knee prosthetic. Furthermore, dynamic testing assess mechanical responses high-intensity exercises (e.g., sprinting, jumping). response plantogram-derived pressure data during phases (standing, light walking) (sprinting, jumping) optimal geometry density, ensuring maximum compatibility. innovative allows tailored replication motion patterns, resulting improved patient outcomes higher success rates. proposed design presented hysteretic damping factor energy absorption efficiency adequate load handling intense (0.18 loss factor, 57% efficiency) meaning it is suitable further research upcycling.

Language: Английский

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Supportless Lattice Structure for Additive Manufacturing of Functional Products and the Evaluation of Its Mechanical Property at Variable Strain Rates

Materials, Journal Year: 2022, Volume and Issue: 15(22), P. 7954 - 7954

Published: Nov. 10, 2022

This study proposes an innovative design solution based on the for additive manufacturing (DfAM) and post-process industrial-grade products by reducing (AM) time improving production agility. The of supportless open cell Sea Urchin lattice structure is analyzed using DfAM material extrusion (MEX) process to print support free in any direction. converted into a global closed entrap secondary foam material. 3D printed with Polyethylene terephthalate glycol (PETG) filled Hybrid MEX process. Foam-filling improves structure's energy absorption crash force efficiency when tested at different strain rates. An industrial case demonstrates importance application this lightweight tough meet challenging current future mass customization market. A consumer-based scenario chosen wherein 3D-printed universal puck accommodates shapes across supply line. pucks are prone collisions line, generating shock loads hazardous noise. results show that support-free closed-cell structures improve high rate enhance functional requirement noise reduction during collision.

Language: Английский

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Shear-thickening-fluid-based meta-material for adaptive impact response

Materials & Design, Journal Year: 2024, Volume and Issue: 244, P. 113174 - 113174

Published: July 23, 2024

Lattice and Triply-Periodic-Minimal-Surface (TPMS) structures are widely employed in different engineering disciplines, combining interesting designs with optimal mechanical properties thanks to the capabilities of Additive Manufacturing. In this framework, a technique based on filling 3D-printed flexible structure shear-thickening fluid (STF) is proposed improve response resulting bi-phase composite under impact loads low-velocity regime up around 3 m/s. Test data indicate that once critical shear rate threshold for reached, STF-filled can effectively smooth peak acceleration by 50%, decrease penetration depth significantly enhance energy absorption capability remarkable 85%. The hybrid paves way novel functional applications, exploiting adaptive behavior non-Newtonian fillers. To end, Finite-Element model further investigate optimize underlying fluid-structure interaction responsible improvement dynamic compressive response.

Language: Английский

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Influence of the Type of Plastic and Printing Technologies on the Compressive Behavior of 3D-Printed Heel Prototypes

Materials, Journal Year: 2023, Volume and Issue: 16(5), P. 1930 - 1930

Published: Feb. 26, 2023

In this study, the possibility of using modern AM technologies to produce designed heels for personalized orthopedic footwear with a medium heel was explored. Seven variants were produced three 3D printing methods and polymeric materials different natures: PA12 made SLS method, photopolymer SLA PLA, TPC, ABS, PETG, PA (NYLON) FDM method. A theoretical simulation forces 1000 N, 2000 3000 N performed in order evaluate possible human weight loads pressure during shoe production. The compression test 3D-printed prototypes showed that it is replace traditional wooden hand-made good-quality methods, but also printed cheaper All these withstood more than 15,000 without damage. It determined TPC not suitable product design purpose. Due its greater brittleness, PETG must be verified by additional experiments.

Language: Английский

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Mechanical Behavior of Bamboo-Like Structures under Transversal Compressive Loading

Biomimetics, Journal Year: 2023, Volume and Issue: 8(1), P. 103 - 103

Published: March 5, 2023

Inspired by many biological structures in nature, biomimetic demonstrate significantly better mechanical performance than traditional engineering structures. The exceptional properties of natural materials are attributed to the hierarchical architecture their structure. Consequently, implementation design lightweight with tailored has been constantly increasing fields science and engineering. bamboo structure is particular interest because it combines a light weight excellent properties, often surpassing those several materials. objective this study was evaluate behavior bamboo-inspired subjected transversal compressive loading. Structures consisting bamboo-like thin-walled hexagonal building blocks (unit cells) different dimensions were fabricated stereolithography 3D printing evaluated testing, high-speed camera video recordings, finite element simulations. results elastic modulus, yield strength, strain energy density at fracture interpreted terms characteristic unit cell failure process elucidated images fractured simulation maps. that ultralight specific characteristics can be produced optimizing number cell.

Language: Английский

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The Designs and Testing of Biodegradable Inserts for Enhanced Crashworthiness in Sports Helmets

Published: Aug. 15, 2024

The article addresses manufacturing structures made of biodegradable materials that can be successfully used as energy-absorbing liner sports helmets all kinds, replacing the previously expanded polystyrene. paper is focused on injection technological tests and tensile (in quasi-static dynamic conditions) several composites based a PLA matrix with addition other softening agents, such PBAT TPS. Next, thin-walled elements (dimensions 55 x 20 mm) were manufactured evaluated using spring-loaded drop hammer. 60J impact energy was tested according to EN 1078 standard. crushing testing included checking influence temperature (-20, 0, 20, 40 °C) velocity. PLA15PBAT85 blend selected most effective material in terms its use for sport helmets.

Language: Английский

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Influence of structural arrangements on static and dynamic properties of additively manufactured polyester elastomer lattice metamaterials

Applied Materials Today, Journal Year: 2023, Volume and Issue: 35, P. 101933 - 101933

Published: Sept. 20, 2023

Language: Английский

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Impact energy absorption and fracture mechanism of FFF made fiberglass reinforced polymer composites

Rapid Prototyping Journal, Journal Year: 2022, Volume and Issue: 29(2), P. 275 - 287

Published: July 28, 2022

Purpose The fiber reinforced polymer composites are becoming more critical because of their exceptional mechanical properties and lightweight structures. Fused filament fabrication (FFF) is a three-dimensional (3D) printing technique that can manufacture composite However, the effect impact performance on structural integrity FFF made compared to pre-preg primary concern for practical usage 3D printed parts. Therefore, this paper aims investigate different processing parameters composites. Design/methodology/approach This investigates build orientation, stacking sequence angle properties. Two orientations, three sequences two angles have been selected study. Charpy testing carried out energy absorption Onyx as matrix material types fibers, is, fiberglass high strength temperature (HSHT) reinforcements, used fabrication. Findings Results indicate orientation largely affect part built with XYZ 0º/90º B type resulted into maximum energy. comparing both reinforcement, HSHT in higher than regular fiberglass. Originality/value study evaluates damage modes during absorbed by samples measured compare conditions. investigation very limited FFF-based process. results also provide database select obtain required

Language: Английский

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Ventilated surface-based lattice structures designed for polymer powder bed fusion process

The International Journal of Advanced Manufacturing Technology, Journal Year: 2024, Volume and Issue: 132(1-2), P. 113 - 126

Published: March 7, 2024

Language: Английский

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