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Manufacturing

Additive manufacturing

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Displaying 226 - 250 of 400

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

Merging experiments and computer simulations in X-ray Computed Tomography probability of detection analysis of additive manufacturing flaws

January 27, 2021
Author(s)
Felix Kim, Adam L. Pintar, Jason Fox, Jared B. Tarr, Alkan Donmez, Anne-Francoise Obaton
X-ray Computed Tomography (XCT) is a growing industrial non-destructive testing (NDT) technique for advanced manufacturing industries such as additive manufacturing (AM). Probability of detection (POD) is a critical aspect for qualifying NDT techniques

The creep and fracture properties of additively manufactured inconel 625

January 25, 2021
Author(s)
Kwang-Tae Son, Thien Q. Phan, Lyle Levine, Kyu-Sik Kim, Kee-Ahn Lee, Magnus Ahlfors, Michael E. Kassner
High temperature creep tests of additively manufactured (AM) nickel-based superalloy Inconel 625 (IN 625) and wrought 625 were conducted at 650 ˚C and 800 ˚C over the stress range of 65 MPa to 658 MPa. Thermal treatments were conducted prior to creep

The effects of particle size distribution on the rheological properties of the powder and the mechanical properties of additively manufactured 17-4 PH stainless steel

January 14, 2021
Author(s)
Jordan S. Weaver, Justin G. Whiting, Vipin Tondare, Carlos R. Beauchamp, Max A. Peltz, Jared B. Tarr, Thien Q. Phan, Mehmet Donmez
It is well known that changes in the starting powder can have a significant impact on the laser powder bed fusion process and subsequent part performance. Relationships between the powder particle size distribution and powder performance such as

Axial force radiometer for primary standard laser power measurements using photon momentum

January 11, 2021
Author(s)
Paul Williams, Kyle Rogers, Joshua A. Hadler, Alexandra Artusio-Glimpse, John Lehman
We have fully demonstrated operation of a new photon momentum radiometer for measuring laser power levels above 1 kW by use of radiation pressure. The "axial" design allows the input and output laser beams to remain collinear and the force sensing can be

In situ characterization of ceramic cold sintering by small-angle scattering

January 1, 2021
Author(s)
Andrew Allen, Igor Levin, Russell Maier, Suzanne E. Witt, Fan Zhang, Ivan Kuzmenko
The first in situ characterization of the pore morphology evolution during the cold sintering process (CSP) is presented using small-angle X-ray scattering methods. For practical reasons, measurements have been made on a model system, KH2PO4 (KDP). The

Microscale Photopatterning of Through-thickness Modulus in a Monolithic and Functionally Graded 3D Printed Part

December 24, 2020
Author(s)
Asais C. Uzcategui, Callie I. Higgins, John Hergert, Andrew Tomaschke, Victor Crespo-Cuevas, Virginia L. Ferguson, Stephanie Bryant, Robert R. McLeod, Jason Killgore
3D printing is transforming traditional processing methods in applications ranging from tissue engineering to optics. To fulfill its maximum potential, 3D printing requires a robust technique for producing structures with precise three-dimensional (x, y
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