Dimensional accuracy and simulation-based optimization of polyolefins and biocopolyesters for extrusion-based additive manufacturing and steam sterilization. DOI Creative Commons
Felix Burkhardt, Carl G. Schirmeister, Christian Wesemann

и другие.

Journal of the mechanical behavior of biomedical materials/Journal of mechanical behavior of biomedical materials, Год журнала: 2024, Номер 153, С. 106507 - 106507

Опубликована: Март 13, 2024

Polyolefins exhibit robust mechanical and chemical properties can be applied in the medical field, e.g. for manufacturing of dentures. Despite their wide range applications, they are rarely used extrusion-based printing due to warpage tendency. The aim this study was investigate reduce polyolefins compared commonly filaments after additive (AM) sterilization using finite element simulation. Three types were investigated: a medical-grade polypropylene (PP), glass-fiber reinforced (PP-GF), biocopolyester (BE) filament, an acrylic resin (AR) material jetting. Square specimens, standardized samples prone warpage, denture bases (n = 10 each group), as clinically relevant anatomically shaped reference, digitized AM steam (134 °C). To determine volume underneath square specimens calculated, while deviations from file measured root mean (RMS) values. PP base, simulation based on thermomechanical calculations performed. Statistical analysis conducted Kruskal-Wallis test, followed by Dunn's test multiple comparisons. results showed that exhibited greatest AM, PP-GF, BE, AR minimal before sterilization. However, increased BE during sterilization, whereas remained more stable. After made highest warpage. Through simulation-based optimization, base successfully reduced 25%. In contrast reference materials, demonstrated greater dimensional stability making it potential alternative applications. Nevertheless, reducing cooling process remains necessary, optimization holds promise addressing issue.

Язык: Английский

Reinforced HDPE with optimized biochar content for material extrusion additive manufacturing: morphological, rheological, electrical, and thermomechanical insights DOI Creative Commons
Nectarios Vidakis, Markos Petousis, Dimitrios Kalderis

и другие.

Biochar, Год журнала: 2024, Номер 6(1)

Опубликована: Апрель 9, 2024

Abstract The development of efficient and sustainable composites remains a primary objective both research industry. In this study, the use biochar, an eco-friendly reinforcing material, in additive manufacturing (AM) is investigated. A high-density Polyethylene (HDPE) thermoplastic was used as matrix, material extrusion (MEX) technique applied for composite production. Biochar produced from olive tree prunings via conventional pyrolysis at 500 °C. Composite samples were created using biochar loadings range 2.0–10.0 wt. %. 3D-printed mechanically tested accordance with international standards. Thermogravimetric analysis (TGA) Raman spectroscopy to evaluate thermal structural properties composites. Scanning electron microscopy examine fractographic morphological characteristics materials. electrical/dielectric HDPE/biochar studied over broad frequency (10 –2 Hz–4 MHz) room temperature. Overall, laborious effort 12 different tests implemented fully characterize developed investigate correlations between qualities. This investigation demonstrated that MEX process can be satisfactory reinforcement agent. Notably, compared control pure HDPE, increased tensile strength by 20% flexural 35.9% when added loading 4.0 impact microhardness also significantly improved. Furthermore, Direct current (DC) conductivity insulating HDPE five orders magnitude 8.0 % content, suggesting percolation threshold. These results highlight potential C-based further exploit their applicability providing parts improved mechanical performance profiles. Graphical

Язык: Английский

Процитировано

19

Multifunctional HDPE/Cu biocidal nanocomposites for MEX additive manufactured parts: Perspectives for the defense industry DOI Creative Commons
Nectarios Vidakis, Nikolaos Michailidis, Markos Petousis

и другие.

Defence Technology, Год журнала: 2024, Номер 38, С. 16 - 32

Опубликована: Март 29, 2024

In this study, we investigated the performance improvement caused by addition of copper (Cu) nanoparticles to high-density polyethylene (HDPE) matrix material. Composite materials, with filler percentages 0.0, 2.0, 4.0, 6.0, 8.0, and 10.0 wt% were synthesized through material extrusion (MEX) 3D printing technique. The nanocomposite filaments utilized for manufacturing specimens suitable experimental procedure that followed. Hence, able systematically investigate their tensile, flexural, impact, microhardness properties various mechanical tests conducted according corresponding standards. Broadband Dielectric Spectroscopy was used electrical/dielectric composites. Moreover, employing means Raman spectroscopy thermogravimetric analysis (TGA) also further vibrational, structural, thermal properties. Concomitantly, scanning electron microscopy (SEM), as well atomic force (AFM), examination morphological structural characteristics specimens, while energy-dispersive X-ray (EDS) performed in order receive a more detailed picture on nanomaterials assessed antibacterial regarding Staphylococcus aureus (S. aureus) Escherichia coli (E. coli) assistance method named screening agar diffusion. results showed HDPE benefited from utilization Cu filler, they notable improvement. specimen HDPE/Cu 4.0 one presented highest levels reinforcement four out seven tested (for example, it exhibited 36.7% flexural strength, compared pure matrix). At same time, nanocomposites efficient against S. bacterium less E. bacterium. use such multi-functional, robust MEX is positively impacting applications fields, most notably defense security sectors. latter becomes increasingly important if takes into account firearms encompass polymeric parts require robustness improved properties, at time keeping risk spreading infectious microorganisms bare minimum.

Язык: Английский

Процитировано

17

Α coherent optimization course of the silicon nitride nanofiller load in medical grade isotactic polypropylene for material extrusion additive manufacturing: Rheology, engineering response, and cost-effectiveness DOI Creative Commons
Nectarios Vidakis, Nikolaos Michailidis, Apostolos Argyros

и другие.

Colloid & Polymer Science, Год журнала: 2024, Номер 302(6), С. 843 - 860

Опубликована: Фев. 22, 2024

Abstract By enabling the development of complex structures with adaptable qualities, techniques for additive manufacturing have opened new routes material and research. In this research, silicon nitride (Si 3 N 4 ) ceramic nanoparticles are incorporated into polypropylene (PP) matrices. Various loading levels standardized test specimens that adhere to ASTM criteria created. The main goal is thoroughly characterize these composites an emphasis on their mechanical capabilities. rheological, thermomechanical, morphological properties 3D-printed PP/Si created using extrusion (MEX) 3D printing examined. Thermogravimetric analysis differential scanning calorimetry exploited study thermal stability phase transitions in composite materials. Mechanical testing conducted determine such as flexural tensile strength modulus elasticity. For detailed characterization nanocomposites, electron microscopy, Raman spectroscopy also performed. results provide insight impact Si properties, stability, rheological behavior composites. 2 wt% filler showed overall best performance improvement (21% elasticity, 15.7% strength, high values remaining assessed). nanocomposite maximum a 33.6% increased microhardness than pure PP thermoplastic, showing promising wear resistance parts built it. This research reveals ability improve characteristics PP-based compounds produced by MEX printing. Graphical

Язык: Английский

Процитировано

9

Biochar for sustainable additive manufacturing: Thermal, mechanical, electrical, and rheological responses of polypropylene-biochar composites DOI
Markos Petousis, Emmanuel Maravelakis, Dimitrios Kalderis

и другие.

Biomass and Bioenergy, Год журнала: 2024, Номер 186, С. 107272 - 107272

Опубликована: Июнь 10, 2024

Язык: Английский

Процитировано

9

Sustainability-driven additive manufacturing: Implementation and content optimization of fine powder recycled glass in Polylactic Acid for material extrusion 3D printing DOI Creative Commons
Markos Petousis, Nikolaos Michailidis,

Václav Kulas

и другие.

International Journal of Lightweight Materials and Manufacture, Год журнала: 2025, Номер unknown

Опубликована: Март 1, 2025

Язык: Английский

Процитировано

1

Material extrusion 3D printing of synergistically enhanced conductive poly(lactic) acid polymer composites with reduced graphene oxide and glass fibers for high-performance electronic applications DOI
Muhammad Hanif, Li Zhang, Abdul Hakim Shah

и другие.

Composite Structures, Год журнала: 2025, Номер unknown, С. 119104 - 119104

Опубликована: Март 1, 2025

Язык: Английский

Процитировано

1

Investigating Microstructural and Mechanical Behavior of DLP-Printed Nickel Microparticle Composites DOI Open Access

Benny Susanto,

Vishnu Vijay Kumar, Leonard Sean

и другие.

Journal of Composites Science, Год журнала: 2024, Номер 8(7), С. 247 - 247

Опубликована: Июнь 29, 2024

The study investigates the fabrication and analysis of nickel microparticle-reinforced composites fabricated using digital light processing (DLP) technique. A slurry is prepared by incorporating Ni-micro particles into a resin vat; it thoroughly mixed to achieve homogeneity. Turbidity fluctuations are observed, initially peaking at 50% within first two minutes mixing then stabilizing 30% after 15–60 min. FTIR spectroscopy with varying Ni wt.% performed alterations in composite material’s molecular structure bonding environment. Spectrophotometric revealed distinctive transmittance signatures specific wavelengths, particularly visible spectrum, notable peak 532 nm. effects printing orientation X, Y, Z axes were also studied. Mechanical properties computed tensile strength, surface roughness, hardness. results indicate substantial enhancements properties, increases 75.5% ultimate strength 160% maximum strain. Minimal roughness hardness suggest favorable printability. Microscopic examination characteristic fracture patterns particulate different values for nickel. findings demonstrate potential DLP-fabricated Ni-reinforced applications demanding enhanced mechanical performance while maintaining printability, paving way further exploration this domain.

Язык: Английский

Процитировано

4

Simultaneous enhancement of the impact strength and tensile modulus of PP/EPDM/TiO2 nanocomposite fabricated by fused filament fabrication DOI

Fatemeh Taher,

Mahmoud Afshari,

Ali Houmani

и другие.

Colloid & Polymer Science, Год журнала: 2023, Номер 302(3), С. 393 - 407

Опубликована: Дек. 6, 2023

Язык: Английский

Процитировано

9

Material extrusion of SEEPS blended isotactic PP for possible application as automotive bumper: Performance analysis through Finite Element Simulation DOI
Rahul Chatterjee, Mrinmoy Mondal,

Suman Acharya

и другие.

Journal of Manufacturing Processes, Год журнала: 2024, Номер 111, С. 166 - 179

Опубликована: Янв. 17, 2024

Язык: Английский

Процитировано

3

Influence of simulated ambience on melt crystallization of isotactic polypropylene towards developing warp-free 3D printing DOI
Rahul Chatterjee, Jagannath Chanda, Sayan Basak

и другие.

Progress in Additive Manufacturing, Год журнала: 2025, Номер unknown

Опубликована: Фев. 3, 2025

Язык: Английский

Процитировано

0