Rapid Prototyping Processes

Pham, Duc Truong; Dimov, Stefan Simeonov

doi:10.1007/978-1-4471-0703-3_2

Cited by 11 publications

(4 citation statements)

References 10 publications

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“…We regarded this as a relevant question taking into account the variety of porous scaffolds with different pore-size architectures described in the literature. To address this issue, we used porous ceramic materials widely tested for tissue engineering purposes [4][5][6][7][8][9][10][11][12][13][14]52,59]. In SFF-designed ceramic scaffolds, with a pore size of 100 mm (figure 5), we were not only able to observe porous structure but also to locate cells as high signal intensity in the porous spaces, in both two-dimensional and three-dimensional assays.…”

Section: Discussionmentioning

confidence: 99%

“…Porous scaffolds have been extensively tested materials for various purposes in tissue engineering [1 -9]. Irregular pore size ceramic scaffolds are used clinically for purposes of bone tissue formation, while solid free form (SFF) techniques-three-dimensional printing, stereo-lithography, fused deposition modelling, robocasting, phase-change jet printing and so onconstitute excellent methods for producing well-defined three-dimensional structures [10][11][12][13][14]. Within this SFF field, scaffolds produced from polycaprolactone (PCL) [15][16][17][18][19][20][21] and ceramics have attracted a lot of attention.…”

Section: Introductionmentioning

confidence: 99%

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Label-free magnetic resonance imaging to locate live cells in three-dimensional porous scaffolds

Abarrategi

Fernández-Valle

Desmet

et al. 2012

J. R. Soc. Interface.

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Porous scaffolds are widely tested materials used for various purposes in tissue engineering. A critical feature of a porous scaffold is its ability to allow cell migration and growth on its inner surface. Up to now, there has not been a method to locate live cells deep inside a material, or in an entire structure, using real-time imaging and a non-destructive technique. Herein, we seek to demonstrate the feasibility of the magnetic resonance imaging (MRI) technique as a method to detect and locate in vitro non-labelled live cells in an entire porous material. Our results show that the use of optimized MRI parameters (4.7 T; repetition time ¼ 3000 ms; echo time ¼ 20 ms; resolution 39 Â 39 mm) makes it possible to obtain images of the scaffold structure and to locate live non-labelled cells in the entire material, with a signal intensity higher than that obtained in the culture medium. In the current study, cells are visualized and located in different kinds of porous scaffolds. Moreover, further development of this MRI method might be useful in several three-dimensional biomaterial tests such as cell distribution studies, routine qualitative testing methods and in situ monitoring of cells inside scaffolds.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Label-free magnetic resonance imaging to locate live cells in three-dimensional porous scaffolds

Abarrategi

Fernández-Valle

Desmet

et al. 2012

J. R. Soc. Interface.

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“…The standard equations (Newton's laws) for heat dissipation during LPBF are taken from (Pham and Dimov 2001) and are applied to the two models. The equations developed by Sih and Barlow (Sih and Barlow 1994) are used to simulate the energy loss due to radiation.…”

Section: Implementation Of Heat Dissipationmentioning

confidence: 99%

An Efficient Track-Scale Model for Laser Powder Bed Fusion Additive Manufacturing: Part 1- Thermal Model

et al. 2021

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This is the first of two manuscripts that presents a computationally efficient full field deterministic model for laser powder bed fusion (LPBF). A new Hybrid Line (HL) heat input model integrates an exponentially decaying (ED) heat input over a portion of a laser path to significantly reduce the computational time. Experimentally measured properties of the high gamma prime nickel-based superalloy RENÉ 65 are implemented in the model to predict the in-process temperature distribution, stresses, and distortions. The model accounts for specific properties of the material as different phases. The first manuscript presents the HL heat transfer model, which is compared with the beam-scale exponentially decaying model, along with the melt pool geometry obtained experimentally by varying the laser parameters. The predicted melt pool geometry of the beam-scale ED model is shown to have good agreement with experimental measurements. While the proposed HL model exhibits lesser accuracy in predicting the melt pool geometries, it can predict the cooling rates and nodal temperatures as accurately as to the ED model. Moreover, under large time integration steps, the HL model becomes more than 1,500 times faster than the ED model.

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“…The most widespread technology is just the melting of plastic wire and the application of semi-liquid material, the fiber next to the fiber and layer by layer until the production of the entire volume of the part. The technology is called Fused Deposition Modeling (FDM) or Fused Filament Fabrication [4,5].…”

Section: Introductionmentioning

confidence: 99%

Strength produced parts by fused deposition modeling

Beniak¹,

Matúš²,

Šooš³

et al. 2020

Global J. Eng. Tech. Adv.

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The aim of using additive manufacturing technologies is to be able to produce a wide range of component designs on a single device, using a wide range of materials and minimizing material consumption. There are several technologies that work on different principles. The present article is focused on Fused Deposition Modeling (FDM) technology, which is focused on the application of layers of semi-molten polymer. The advantage is the lower cost for obtaining of FDM device, but also the low operation cost. The output of production are complex components designed for prototyping, but also for final use. Due to the fact that there is requirement to produce parts also for final use, it is necessary to know the strength properties of the parts after production. Because the structure of parts volume is not homogeneous, it is not possible to subject it to conventional calculations and simulations, but it is necessary to take into account the specifics that are produced during production by FDM technology. The present paper shows the results of experimental determination of the tensile strength of manufactured parts. A series of samples with different properties was used on the FDM device and the tensile strength of the components was subsequently measured. The measured values were compared and evaluated.

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Rapid Prototyping Processes

Abstract: This chapter presents a classification of existing physical Rapid Prototyping (RP) processes along with an outline of each method. For convenience, the term RP will hereafter refer only to physical RP.

Cited by 11 publications

References 10 publications

Label-free magnetic resonance imaging to locate live cells in three-dimensional porous scaffolds

Label-free magnetic resonance imaging to locate live cells in three-dimensional porous scaffolds

An Efficient Track-Scale Model for Laser Powder Bed Fusion Additive Manufacturing: Part 1- Thermal Model

Strength produced parts by fused deposition modeling

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