Additive Manufacturing of Cellulosic Materials with Robust Mechanics and Antimicrobial Functionality

Pattinson, Sebastian W.; Hart, A. John

doi:10.1002/admt.201600084

Cited by 121 publications

(114 citation statements)

References 32 publications

(40 reference statements)

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“…Npr. izdelki, natisnjeni z acetatom celuloze, raztopljenim v acetonu, ki po tiskanju izhlapi, so pokazali upogibno trdnost primerljivo z izdelki, tiskanimi iz ABS polimera (sicer s FDM tehnologijo) (Pattinson & Hart, 2017). Še bolj obetajoča je uporaba nanoceluloze kot ojačitvenega dodatka k že znanim tehnikam in materialom.…”

Section: Ekstrudiranje Materiala Materials Extrusionunclassified

Možnosti uporabe lesa v dodajalnih tehnologijah (3D-tiskanju)

Kariž¹,

Šernek²,

Kuzman³

2017

les-wood

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Keywords: 3D printing, additive technology, wood, wood residues, wood-plastic composites niku prilagojeni izdelki. Veliko razvoja je bilo narejenega na samih tehnikah kot tudi materialih. Ob nižanju cen 3D-tiskalnikov na trgu so le-ti postali dostopnejši tudi za vsakdanjo domačo uporabo tiskanja. Že število iskanj termina »3D printing« na Google pokaže izrazit porast: od leta 2007 do 2015 se je število iskanj tega termina 25-krat povečalo (Wimmer et al., 2015).Osnovni princip dodajalnih tehnologij je grajenje izdelka po plasteh ali slojih, z dodajanjem materiala v slojih, za razliko od klasičnih obdelovalnih tehnik, kjer izdelek običajno izdelamo z odvzemanjem materiala (odrezovalne tehnike), preoblikovanjem materiala (npr. litje, kovanje) ali pa povezovanjem (varjenje, pritrjevanje) (Conner et al., 2014). Izdelava modelov s 3D-tiskanjem je razmeroma enostavna, saj digitalnemu modelu izdelka z ustreznim programom omogočimo razrez STL/AMF/OBJ datotek na tiskalne plasti, ki določijo 3D-tiskalniku pot, ki jo mora opraviti do celovitega končnega izdelka. Pri izdelovanju z odvzemanjem materiala orodje vedno potrebuje prosto UVOD INTRODUCTIONDodajalne tehnologije (ang. additive technologies) je izraz za vrsto različnih tehnik izdelave, katerim je skupno grajenje izdelka po plasteh/slojih. Pogovorno se te tehnologije pogosto imenuje kar 3D-tiskanje, kar izhaja iz ene prvih tehnik, kjer je bilo vezivo nanašano na podoben način kot pri običaj-nem 2D-tiskanju -brizganje tekočine iz posebnih kartuš (v primeru 3D-tiska -brizganje tekočega veziva na plast praškastega materiala). Nekoč pogost izraz je bil tudi hitro prototipiranje (ang. Rapid prototyping), čemur je bila ta tehnika prvotno namenjena -hitri izdelavi prototipov, vendar se ta izraz vse manj uporablja, saj tudi izdelki niso več samo prototipi, ampak lahko služijo tudi kot pravi izdelki, unikatni, maloserijski, ali pa individualno posamez-1 Univerza v Ljubljani, Biotehniška fakulteta, Oddelek za lesarstvo,

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Section: Ekstrudiranje Materiala Materials Extrusionunclassified

Možnosti uporabe lesa v dodajalnih tehnologijah (3D-tiskanju)

Kariž¹,

Šernek²,

Kuzman³

2017

les-wood

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“…As an alternative to the conventional subtractive manufacturing techniques, AM has a large number of key advantages, like the elimination of molds, less material wastes [2], more complex geometrical designs [3], and mass customization. However, poor part integrity and various quality defects are among the biggest problems for AM to overcome.…”

Section: Additive Manufacturingmentioning

confidence: 99%

Integration of physically-based and data-driven approaches for thermal field prediction in additive manufacturing

Jin

2018

Materials & Design

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A quantitative understanding of thermal field evolution is vital for quality control in additive manufacturing (AM). Because of the unknown material parameters, high computational costs, and imperfect understanding of the underlying science, physically-based approaches alone are insufficient for component-scale thermal field prediction. Here, I present a new framework that integrates physically-based and data-driven approaches with quasi in situ thermal imaging to address this problem. The framework consists of (i) thermal modeling using 3D finite element analysis (FEA), (ii) surrogate modeling using functional Gaussian process, and (iii) Bayesian calibration using the thermal imaging data. Based on heat transfer laws, I first investigate the transient thermal behavior during AM using 3D FEA. A functional Gaussian process-based surrogate model is then constructed to reduce the computational costs from the high-fidelity, physically-based model. I finally employ a Bayesian calibration method, which incorporates the surrogate model and thermal measurements, to enable layer-to-layer thermal field prediction across the whole component. A case study on fused deposition modeling is conducted for components with 7 to 16 layers. The cross-validation results show that the proposed framework allows for accurate and fast thermal field prediction for components with different process settings and geometric designs. Integration of Physically-based and Data-driven Approaches for Thermal Field Prediction in Additive ManufacturingJingran Li GENERAL AUDIENCE ABSTRACT This paper aims to achieve the layer to layer temperature monitoring and consequently predict the temperature distribution for any new freeform geometry. An engineering statistical synergistic model is proposed to integrate the pure statistical methods and finite element modeling (FEM), which is physically meaningful as well as accurate for temperature prediction. Besides, this proposed synergistic model contains geometry information, which can be applied to any freeform geometry. This paper serves to enable a holistic cyber physical systems-based approach for the additive manufacturing (AM) not only restricted in fused deposition modeling (FDM) process but also can be extended to powder-based process like laser engineered net shaping (LENS) and selective laser sintering (SLS). This paper as well as the scheduled future works will make it affordable for customized AM including customized geometries and materials, which will greatly accelerate the transition from rapid prototyping to rapid manufacturing. This article demonstrates a first evaluation of engineering statistical synergistic model in AM technology, which gives a perspective on future researches about online quality monitoring and control of AM based data fusion principles. iv ACKNOWLEDGEMENTS

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“…Apesar da dificuldade em se derreter a celulose no processo de impressão 3D em função do calor, pesquisadores do Massachusetts Institute of Technology, Pattinson & Hart (2017), desenvolveram um método em que o pó de acetato de celulose é dissolvido em acetona preparando-se um fluido viscoso. A extrusão deste fluido é realizada utilizando-se uma impressora 3D de pórtico que não utiliza calor.…”

Section: Materialidade E Design De Superfícieunclassified

“…Essa técnica criada por Pattinson & Hart (2017) (Laranjeira & Marar, 2014, p.8), e isso pode levar a um casamento entre estrutura e vedação numa única solução.…”

Section: Materialidade E Design De Superfícieunclassified

Impressão 3D e processo de projeto paramétrico aplicado ao design emergencial

Venancio¹,

Rocha²

2017

Blucher Design Proceedings

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After the biggest environmental disaster in Brazil, the issue of emergency design emerged. The emergency design is guided by effective and agile responses to disasters and develops specific project intelligences which deals with the particularities and complexities of emergency situations. In this paper concepts and experimental solutions of emergency design are investigated using parametric design and 3d printing. The project explored light biomimetic structural frames and surfaces and analyses the potential of biodegradable materials such as cellulose acetate in the production of these components to create spatial architectural solutions.

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Additive Manufacturing of Cellulosic Materials with Robust Mechanics and Antimicrobial Functionality

Cited by 121 publications

References 32 publications

Možnosti uporabe lesa v dodajalnih tehnologijah (3D-tiskanju)

Možnosti uporabe lesa v dodajalnih tehnologijah (3D-tiskanju)

Integration of physically-based and data-driven approaches for thermal field prediction in additive manufacturing

Impressão 3D e processo de projeto paramétrico aplicado ao design emergencial

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