Wyniki wyszukiwania - BazTech

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Mathematical approach to design 3D scaffolds for the 3D printable bone implant

Wojnicz Wiktoria, Augustyniak Marek, Borzyszkowski Piotr

Biocybernetics and Biomedical Engineering

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2021

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Vol. 41, no. 2

667--678

EN

This work demonstrates that an artificial scaffold structure can be designed to exhibit mechanical properties close to the ones of real bone tissue, thus highly reducing the stress-shielding phenomenon. In this study the scan of lumbar vertebra fragment was reproduced to create a numerical 3D model (this model was called the reference bone sample). New nine 3D scaffold samples were designed and their numerical models were created. Using the finite element analysis, a static compression test was performed to assess the effective Young modulus of each tested sample. Also, two important metrics of each sample were assessed: relative density and surface area. Each new designed 3D scaffold sample was analyzed by considering two types of material properties: metal alloy properties (Ti-6Al-4V) and ABS polymer properties. Numerical analysis results of this study confirm that 3D scaffold used to design a periodic structure, either based on interconnected beams (A, B, C, D, E and F units) or made by removing regular shapes from base solid cubes (G, H, I units), can be refined to obtain mechanical properties similar to the ones of trabecular bone tissue. Experimental validation was performed on seven scaffolds (A, B, C, D, E, F and H units) printed from ABS material without any support materials by using Fused Deposition Modeling (FMD) technology. Results of experimental Young modulus of each printed scaffold are also presented and discussed.

2

Impact of additive manufacturing temperature on strength of 3D printouts made of PLA and ABS

Hylla Piotr, Domin Jarosław

Mining Machines

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2020

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no. 3

43--52

EN

The 3D printing technology is an example of innovative approach to the manufacturing technology. It finds further application fields, due to the rapid development of printers and the materials to be used. The article presents and describes the currently used additive manufacturing technologies called 3D printing, the materials used and the results of tensile strength tests of PLA and ABS prints. The process of preparing objects for 3D printing is presented and the testing methodology is described. Conclusions are formulated regarding the impact of printing nozzle temperature on the objects tensile strength. Standardized samples printed from ABS and PLA were tested. The summary also presents the possibilities of using objects made by 3D printing in practice.

PL

Technika druku 3D jest przykładem innowacyjnego podejścia do zagadnień technologii wytwarzania. Znajduje ona kolejne obszary zastosowań, co jest możliwe dzięki szybkiemu rozwojowi drukarek oraz stosowanych materiałów. W artykule przedstawiono i opisano obecnie stosowane technologie druku przestrzennego potocznie określanego jako druk 3D, wykorzystywane materiały oraz wyniki badań wytrzymałości wydruków z PLA i ABS na rozciąganie. Zaprezentowano proces przygotowania elementów w technologii druku 3D oraz opisano sposób przeprowadzenia badania. Sformułowano wnioski odnośnie wpływu temperatury dyszy drukującej na wytrzymałość elementów na rozciąganie. Badania przeprowadzono na znormalizowanych próbkach wydrukowanych z ABS oraz PLA. W podsumowaniu przedstawiono również możliwości zastosowania obiektów wykonanych metodą druku przestrzennego w praktyce.

3

Energy-saving information storage using laser technologies

Kostrubiec F., Pawlak R., Tomczyk M., Walczak M.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2005

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Vol. 42, nr 16

51-63

EN

In the paper there are presented selected energetic problems in the information storage technique. The main goal of this technique is achievement of good efficiency and reliability with the smaller consumption of energy. In this area the laser technologies are unbeaten. Information storage laser technologies take advantage of the different phenomena in laser beam-matter interaction. Some of the methods enable single- writing storage and another - rewritable storage. In the paper there are described laser processes of storage, thermally activated - in the presence of magnetic and electric fields or without them. Still increasing accuracy of mapping and writing density is possible by dint of development new materials and high precision microtechnologies, but first of all thanks of impressive properties of lasers and laser beam.