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Manufacturing

Additive manufacturing

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Displaying 201 - 225 of 388

Simulated filament shapes in embedded 3D printing

July 22, 2021
Author(s)
Leanne Friedrich, Jonathan Seppala
Embedded 3D printing, wherein fluid inks are extruded into a bath, has enabled the manufacture of complex, custom structures ranging from cell-laden tissue analogues to soft robotics. This method encompasses two techniques: embedded ink writing (EIW)

A Prototype of a Standard Spreadability Tester for Additive Manufacturing

June 23, 2021
Author(s)
Justin G. Whiting, Vipin Tondare, Shawn P. Moylan, Alkan Donmez
We describe a simple device called Standard Spreadability Tester (SST). The idea behind the SST is that instead of trying to predict how a powder will spread using the powder's intrinsic properties (e.g., PSD, morphology, surface, and chemical makeup) or

Texture Evolution as a Function of Scan Strategy and Build Height in Electron Beam Melted Ti-6Al-4V

June 12, 2021
Author(s)
Alec Saville, Sven Vogel, Adam Creuziger, Jake Benzing, Adam Pilchak, Lee Semiatin, Peeyush Nandwana, Kester Clarke, Jonah Klemm-Toole, Amy Clarke
Metal additive manufacturing (AM) enables customizable, on-demand parts, allowing for new designs and improved engineering performance. Unfortunately, the ability to control AM metal alloy microstructures is still lacking, especially when considering

Three-dimensional particle size, shape, and internal porosity characterization: Application to five similar titanium alloy (Ti-6Al-4V) powders and comparison to two-dimensional measurements

May 26, 2021
Author(s)
Edward Garboczi, Rainer Hebert, Yu Sun, Mark Aindow
In an earlier paper, titanium alloy (Ti-6Al-4V) powders from six different vendors were characterized with a number of methods in an attempt to distinguish these powders that were all nominally meeting additive manufacturing standards. One of the methods

Fabrication of 3D Printed Hydroxyapatite Composite Scaffolds for Bone Regeneration

May 19, 2021
Author(s)
Yoontae Kim, Eun-Jin Lee, Albert Davydov, Stanislav Frakhtbeyen, Jonathan Seppala, Laurence Chow, Tagaki Shozo, Stella Alimperti
Additive biomanufacturing has been adapted in a wide variety of biomedical and tissue engineering applications, including orthopedics. The ability to print biocompatible, patient-specific geometries with controlled porosity, mechanical strength has made

Neutron Imaging of Laser Melted SS316 Test Objects with Spatially Resolved Small Angle Neutron Scattering

April 21, 2021
Author(s)
Daniel S. Hussey, Adam J. Brooks, Caroline G. Lowery, Gerald L. Knapp, Bridget E. Cadigan, Shengmin Guo, Leslie G. Butler
A novel neutron far field interferometer is explored for sub-micron porosity detection in laser sintered SS316 test objects. The results shown are images and volumes of the first quantitative neutron dark-field tomography at various autocorrelation lengths

Lessons learned in the design of reference fiducials for layer-wise analysis of test coupons made by laser powder bed fusion

April 16, 2021
Author(s)
Massimiliano Ferrucci, Tom Craeghs, Sven Cornelissen, Michele Pavan, Wim Dewulf, Alkan Donmez
The ability to align ex-situ inspection data of an additively manufactured (AM) part to its build geometry can be helpful, for example, to correlate observed in-situ monitoring events or features to measured discontinuities, such as pores and cracks, in ex

Estimations of the effective Young's modulus of specimens prepared by fused filament fabrication

April 5, 2021
Author(s)
Lichen Fang, Yishu Yan, Ojaswi Agarwal, Jonathan Seppala, Kalman D. Migler, Thao D. Nguyen, Kevin Hemker, Sung Hoon Kang
The elastic response of homogeneous isotropic materials is most commonly represented by their Young's modulus (E), but geometric variability associated with additive manufacturing results in materials that are neither homogeneous nor isotropic. Here we

Damage tolerant design of additively manufactured metallic components subjected to cyclic loading: State of the art and challenges

March 18, 2021
Author(s)
Uwe Zerbst, Giovanni Bruno, Jean-Yves Buffiere, Thomas Wegener, Tao Wu, Xiang Zhang, Nikolai Kashaev, Giovanni Meneghetti, Nik Hrabe, Mauro Madia, Tiago Werner, Kai Hildgenburg, Radek Proch?zka, Martina Koukol?kov?, Jan D?ugan, Benjamin M?ller, Stefano Beretta, Alexander Evans
Undoubtedly, a better understanding and the further development of approaches for damage tolerant component design of AM parts are among the most significant challenges currently facing the use of these new technologies. This article presents a thorough
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