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Toward a common laser powder bed fusion qualification test artifact Addit. Manuf. (IF 7.002) Pub Date : 2020-12-31 H.C. Taylor; E.A. Garibay; R.B. Wicker
Test artifacts have been used to evaluate additive manufacturing (AM) systems since the early 1990s with over 65 artifacts published to date. Due to the system agnostic approach to artifact design, principally focused on geometric accuracy, there has yet to be a widely adopted artifact for laser powder bed fusion (LPBF). To speed qualification of LPBF, a rapid method that quantifies impacts of process
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Influence of 3D printing settings on mechanical properties of ABS at room temperature and 77 K Addit. Manuf. (IF 7.002) Pub Date : 2021-01-08 F. Saenz; C. Otarola; K. Valladares; J. Rojas
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Slow and fast crystallising poly aryl ether ketones (PAEKs) in 3D printing: Crystallisation kinetics, morphology, and mechanical properties Addit. Manuf. (IF 7.002) Pub Date : 2021-01-08 Nan Yi; Richard Davies; Adam Chaplin; Paul McCutchion; Oana Ghita
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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 Addit. Manuf. (IF 7.002) Pub Date : 2021-01-14 Jordan S. Weaver; Justin Whiting; Vipin Tondare; Carlos Beauchamp; Max Peltz; Jared Tarr; Thien Q. Phan; M. Alkan Donmez
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Heat treatment simulation of Ti-6Al-4V parts produced by selective laser melting Addit. Manuf. (IF 7.002) Pub Date : 2020-12-17 Amandine Cardon; Charles Mareau; Yessine Ayed; Sjoerd Van Der Veen; Eliane Giraud; Philippe Dal Santo
The present work focuses on the simulation of the heat treatment applied after printing of Ti-6Al-4V parts. The numerical tool aims at predicting the influence of heat treatment conditions (e.g. holding time, temperature) on the residual stress field and the distortions for SLM produced parts. The numerical model relies on a thermo-viscoplastic constitutive model. To determine the corresponding material
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Reusable support for additive manufacturing Addit. Manuf. (IF 7.002) Pub Date : 2021-01-12 Yang Xu; Ziqi Wang; Siyu Gong; Yong Chen
Additive manufacturing (AM) processes such as material extrusion and vat photopolymerization all require supports to print parts with overhang features. These additional supports using the same or different materials are a waste of materials since they need to be removed after the three-dimensional (3D) printing process and cannot be reused. The printing of supports is also time-consuming for the nozzle-based
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Design of non-assembly mechanisms: A state-of-the-art review Addit. Manuf. (IF 7.002) Pub Date : 2021-01-09 Kirsten Lussenburg; Aimée Sakes; Paul Breedveld
Additive Manufacturing (AM) or 3D printing has enabled the production of increasingly complex parts that are difficult to produce with conventional manufacturing methods. Its additive nature has made it possible to create interlocking parts in a single production step. This creates opportunities for new ways of designing and producing mechanisms, which do not need to be assembled after production,
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Micro-cracking, microstructure and mechanical properties of Hastelloy-X alloy printed by laser powder bed fusion: as-built, annealed and hot-isostatic pressed Addit. Manuf. (IF 7.002) Pub Date : 2021-01-15 Hui Wang; Liu Chen; Bogdan Dovgyy; Wenyong Xu; Aixue Sha; Xingwu Li; Huiping Tang; Yong Liu; Hong Wu; Minh-Son Pham
This study analyses literature data to identify optimised print parameters and assesses the consolidation, microstructure, and mechanical properties of Hastelloy-X printed by laser powder bed fusion. Effects of post annealing and hot-isostatic pressing (HIP) on the microstructure and mechanical properties are also revealed. The susceptibility to the solidification cracking was evaluated on the basis
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Polymer infiltrated ceramic networks with biocompatible adhesive and 3D-printed highly porous scaffolds Addit. Manuf. (IF 7.002) Pub Date : 2021-01-15 Ludmila Hodasova; Jordi Sans; Brenda G. Molina; Carlos Alemán; Luis Llanes; Gemma Fargas; Elaine Armelin
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Eliminating segregation defects during additive manufacturing of high strength β-titanium alloys Addit. Manuf. (IF 7.002) Pub Date : 2021-01-15 C.H. Ng; M.J. Bermingham; M.S. Dargusch
Segregation defects, known as β-flecks, have long detracted from the widespread use of metastable β-Titanium alloys produced via solidification routes. These defects form when segregated β-stabilising solute such as chromium create localised phase instabilities which is detrimental to the alloy’s aging response and mechanical properties. This work explores whether Additive Manufacturing is a viable
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Characterization of as-built and heat-treated Ni-Mn-Ga magnetic shape memory alloy manufactured via laser powder bed fusion Addit. Manuf. (IF 7.002) Pub Date : 2021-01-14 Ville Laitinen; Alexei Sozinov; Andrey Saren; Markus Chmielus; Kari Ullakko
Magnetic shape memory (MSM) alloys have a high potential as an emerging class of actuator materials for a new generation of fast and simple digital components. In this study, the MSM alloy Ni50.5Mn27.5Ga22.0 was built via laser powder bed fusion (L-PBF) using gas atomized powder doped with excess Mn to compensate for the expected evaporation of Mn during L-PBF. The built samples were subjected to stepwise
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Microstructure and anodic electrochemical behavior of additive manufactured Hastelloy X alloy via directed energy deposition Addit. Manuf. (IF 7.002) Pub Date : 2021-01-01 Shaoli Zhang; Jianrui Liu; Xin Lin; Yaohui Huang; Yufeng Zhang; Pengfei Guo; Jiaqiang Li; Weidong Huang
The microstructure characteristics and anodic electrochemical behavior of Hastelloy X fabricated by directed energy deposition were investigated in this work. The microstructure of as-deposited Hastelloy X mainly consisted of columnar dendrites along the deposition direction. The dendrite trunk was the γ matrix, and the inter-dendritic region was composed of the Mo-rich γ phase and carbides. After
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Controlling and testing anisotropy in additively manufactured stochastic structures Addit. Manuf. (IF 7.002) Pub Date : 2021-01-13 Umar Hossain; Shaaz Ghouse; Kenneth Nai; Jonathan RT Jeffers
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Fused Filament Fabrication of Novel Phase-Change Material Functional Composites Addit. Manuf. (IF 7.002) Pub Date : 2021-01-13 Thomas B. Freeman; Melissa A. Messenger; Casey J. Troxler; Kashif Nawaz; Rafael M. Rodriguez; Sandra K.S. Boetcher
Additively manufactured polymer heat exchangers are of recent interest in the thermal sciences due to their lightweight and intricate heat-transfer-enhancing geometrical features. The goal of the present research is to directly encapsulate phase-change material (PCM) into polymer filament for the purpose of 3D printing polymer heat exchangers capable of latent heat thermal energy storage and management
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Using Fillers to Tune Material Properties of an Ion-containing Semi-crystalline Poly(ethylene glycol) for Fused Filament Fabrication Additive Manufacturing Addit. Manuf. (IF 7.002) Pub Date : 2021-01-13 Callie E. Zawaski; Camden A. Chatham; Emily M. Wilts; Timothy E. Long; Christopher B. Williams
The materials library for Fused Filament Fabrication (FFF) additive manufacturing processes has been primarily dominated by amorphous thermoplastic materials. Semi-crystalline polymers form tough plastics due to their strong intermolecular forces, which makes them well suited for applications requiring wear and chemical resistance, thermal stability, and structural loading. However, they are infrequently
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Additive manufacturing of isotropic-grained, high-strength and high-ductility copper alloys Addit. Manuf. (IF 7.002) Pub Date : 2020-12-10 Wenlong Lu; Wenzheng Zhai; Jian Wang; Xiaojun Liu; Liping Zhou; Ahmed Mohamed Mahmoud Ibrahim; Xiaochun Li; Dong Lin; Y. Morris Wang
This work reports additive manufacturing of nickel-aluminum-bronze alloys by electron beam powder bed fusion (EB-PBF), with a relatively homogeneous microstructure at the micro- to meso-scale and exhibiting an exceptional combination of tensile strength and ductility — well surpassing that of conventionally wrought counterparts. The attainment of both high yield and ultimate tensile strength are attributed
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Mechanical performance of 3D printed polylactide during degradation Addit. Manuf. (IF 7.002) Pub Date : 2020-12-18 Amirpasha Moetazedian; Andrew Gleadall; Xiaoxiao Han; Alper Ekinci; Elisa Mele; Vadim V. Silberschmidt
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In-process simulation of the extrusion to support optimisation and real-time monitoring in fused filament fabrication Addit. Manuf. (IF 7.002) Pub Date : 2020-12-30 M. Moretti; A. Rossi; N. Senin
A simulation model is presented in this work, capable to predict temperature and velocity of the extrudate as well as the compressive force acting on the filament in a fused filament fabrication (FFF) machine operating with a Bowden extruder. The simulation model is developed for future incorporation into a larger on-machine apparatus designed for process monitoring and adaptive control and destined
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Modeling of porosity and grain size effects on mechanical behavior of additively manufactured structures Addit. Manuf. (IF 7.002) Pub Date : 2021-01-05 Mehdi Hamid; M. Sadeq Saleh; Ali Afrouzian; Rahul Panat; Hussein M. Zbib
Additive manufacturing (AM) methods such as Aerosol Jet (AJ) printing allow the fabrication of structures via sintering of micro and/or nanoparticles, leading to microstructures that consist of various combinations of pore and grain sizes. It has been reported that AJ printed and sintered silver micropillars show an unusual behavior of high stiffness and high strain-to-failure for structures with high
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Online droplet anomaly detection from streaming videos in inkjet printing Addit. Manuf. (IF 7.002) Pub Date : 2021-01-06 Luis Javier Segura; Tianjiao Wang; Chi Zhou; Hongyue Sun
Inkjet printing (IJP) has demonstrated its capabilities to produce high-quality and high-resolution parts, such as sensors, bio-chips, etc., with outstanding functionality. However, the quality of the printed parts can be endangered by the abnormal droplet jetting behaviors, which are substantially governed by the process dynamics and ambient conditions. Additionally, the droplet behaviors extensively
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Fused filament fabrication of polypropylene: Influence of the bead temperature on adhesion and porosity Addit. Manuf. (IF 7.002) Pub Date : 2021-01-07 Sébastien Charlon; Julien Le Boterff; Jérémie Soulestin
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Micromechanical modeling approach to single track deformation, phase transformation and residual stress evolution during selective laser melting using crystal plasticity Addit. Manuf. (IF 7.002) Pub Date : 2021-01-02 Matti Lindroos; Tatu Pinomaa; Atte Antikainen; Juha Lagerbom; Joni Reijonen; Tomi Lindroos; Tom Andersson; Anssi Laukkanen
Single track scanning is a widely used method to evaluate the effects of rapid solidification of metals and to analyze their printability. Microstructure level stresses play a dominant role in causing material failure during deposition or poor performance on the finished product. This work formulates a thermomechanical crystal plasticity model capable of presenting microscale level evolution and residual
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Compositional grading of a 316L-Cu multi-material part using machine learning for the determination of selective laser melting process parameters Addit. Manuf. (IF 7.002) Pub Date : 2021-01-07 Behzad Rankouhi; Salman Jahani; Frank E. Pfefferkorn; Dan J. Thoma
The aim of this work is to propose a methodology for rapidly predicting suitable process parameters for additive manufacturing of a 316L-Cu multi-material part with a compositional gradient by using machine learning. Specifically, an algorithm based on a multivariate Gaussian process is developed to predict part density and surface roughness for a given set of laser power, velocity, and hatch spacing
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Expanding manufacturing strategies to advance in porous media planning with material extrusion additive manufacturing Addit. Manuf. (IF 7.002) Pub Date : 2020-12-17 Marcelo Okada Shigueoka; Neri Volpato
The design of porous structures of porous materials or porous media (PM) presents challenges that involve geometric modeling and manufacturing. Additive Manufacturing (AM) based on material extrusion is an important means for PM production. Although there are basic process parameters in this AM technology that allow for the creation of PM, its full potential has not been explored. Adding to that, the
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Exploration of surface roughness measurement solutions for additive manufactured components built by multi-axis tool paths Addit. Manuf. (IF 7.002) Pub Date : 2020-12-30 Hamed Kalami; Jill Urbanic
A thin-wall sphere dome set is manufactured without supports being required using a direct energy deposition additive manufacturing process. A multi-axis tool path combined with a partitioning strategy is utilized. Two partitioning strategies and a rotary toolpath build strategy are applied. The partitioned samples have a 45 mm diameter, and the rotary toolpath sample has a 60 mm diameter. The wall
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3D printed magnetically-actuating micro-gripper operates in air and water Addit. Manuf. (IF 7.002) Pub Date : 2021-01-04 Guangbin Shao; Henry Oliver T. Ware; Jigang Huang; Rihan Hai; Longqiu Li; Cheng Sun
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Defects, densification mechanism and mechanical properties of 300M steel deposited by high power selective laser melting Addit. Manuf. (IF 7.002) Pub Date : 2021-01-04 Guanyi Jing; Zemin Wang
The usage of high laser power is one of the popular strategies to improve the productivity of selective laser melting technology. Herein, the single-track, single-layer and bulk 300M steel specimens were produced by high power selective laser melting (HP-SLM) to investigate the defects, densification mechanism, microstructure, tensile properties and impact toughnesses of HP-SLMed 300M steel parts.
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Efficient modelling of the elastoplastic anisotropy of additively manufactured Ti-6Al-4V Addit. Manuf. (IF 7.002) Pub Date : 2020-12-30 Dylan Agius; Chris Wallbrink; Kyriakos I. Kourousis
The expanded design freedom offered by Additive Manufacture (AM) technologies is stimulating innovation in new directions, but it is also introducing new challenges in material characterisation. The inherent anisotropic behaviour observed in AM materials, like Ti-6Al-4V alloy, is of critical importance to safe and reliable implementation in structurally significant roles. To fully leverage the design
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A novel 3D printed hollow microneedle microelectromechanical system for controlled, personalized transdermal drug delivery Addit. Manuf. (IF 7.002) Pub Date : 2020-12-30 Sophia N. Economidou; Md. Jasim Uddin; Manuel J. Marques; Dennis Douroumis; Wan Ting Sow; Huaqiong Li; Andrew Reid; James F.C. Windmill; Adrian Podoleanu
The advancement of drug delivery devices is critical for the individualization of patient treatment and the improvement of healthcare. Here, we introduce the 3DMNMEMS, a novel device that combines 3D printing, microneedles (MNs) and Microelectromechanical Systems (MEMS), allowing versatile and controllable by the user transdermal drug delivery. Hollow MNs were designed and 3D printed using Stereolithography
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Biomimicry for 3D concrete printing: A review and perspective Addit. Manuf. (IF 7.002) Pub Date : 2020-12-30 Anton du Plessis; Adewumi John Babafemi; Suvash Chandra Paul; Biranchi Panda; Jonathan Phuong Tran; Chris Broeckhoven
Three-dimensional concrete printing (3DCP) is an exciting new manufacturing paradigm for the construction industry. As this technology continues to grow and develop, it is revealing clear signs of progress towards industrial application with various global successes including the manufacturing of pedestrian bridges, houses, office buildings, emergency shelters and military structures. Much of the current
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Concurrent improvement of strength and ductility in heat-treated C300 maraging steels produced by laser powder bed fusion technique Addit. Manuf. (IF 7.002) Pub Date : 2021-01-09 S. Dehgahi; M. Sanjari; M.H. Ghoncheh; B. Shalchi Amirkhiz; M. Mohammadi
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Critical assessment of the impact of process parameters on vertical roughness and hardness of thin walls of AlSi10Mg processed by laser powder bed fusion Addit. Manuf. (IF 7.002) Pub Date : 2020-12-30 O. Poncelet; M. Marteleur; C. van der Rest; O. Rigo; J. Adrien; S. Dancette; P.J. Jacques; A. Simar
This work deals with the impact of prominent process parameters in laser powder bed fusion (L-PBF) technique, also called selective laser melting (SLM), on relevant properties of AlSi10Mg such as surface roughness and hardness. More particularly, the influence of scanning strategies, track energy density (TED), and of the offset between the contours and the bulk hatching were scrutinized. Basic thin
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In-situ formed oxide enables extraordinary high-cycle fatigue resistance in additively manufactured CoCrFeMnNi high-entropy alloy Addit. Manuf. (IF 7.002) Pub Date : 2021-01-04 Young-Kyun Kim; Min-Seok Baek; Sangsun Yang; Kee-Ahn Lee
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Thermo-mechanical modelling of stress relief heat treatments after laser-based powder bed fusion Addit. Manuf. (IF 7.002) Pub Date : 2021-01-08 David De Baere; Pierre Van Cauwenbergh; Mohamad Bayat; Sankhya Mohanty; Jesper Thorborg; Lore Thijs; Brecht Van Hooreweder; Kim Vanmeensel; Jesper H. Hattel
Laser-based powder bed fusion, due to its layer-by-layer nature, results in a unique stress profile in a part after the primary production process. The residual stresses are typically tensile near the top, while they are compressive near the bottom of the part. When it is removed without proper precautions, the part will bend excessively. In order to alleviate this deformation, a stress relief heat
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Compression behavior and energy absorption of 3D printed continuous fiber reinforced composite honeycomb structures with shape memory effects Addit. Manuf. (IF 7.002) Pub Date : 2021-01-08 Chengjun Zeng; Liwu Liu; Wenfeng Bian; Jinsong Leng; Yanju Liu
Three-dimensional (3D) printing is a potential rapid prototyping process that may replace traditional manufacturing processes to fabricate lightweight cellular structures with superior energy absorption performance. In the present work, continuous fiber reinforced composite honeycomb structures (CFRCHSs) with excellent shape memory properties were manufactured through a fused filament fabrication (FFF)
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Nanotwins-containing microstructure and superior mechanical strength of a Cu-9Al-5Fe-5Ni alloy additively manufactured by laser metal deposition Addit. Manuf. (IF 7.002) Pub Date : 2021-01-07 Boyuan Li; Han Zheng; Changjun Han; Kun Zhou
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Investigating the effect of different shielding gas mixtures on microstructure and mechanical properties of 410 stainless steel fabricated via large scale additive manufacturing Addit. Manuf. (IF 7.002) Pub Date : 2020-12-29 Sougata Roy; Bishal Silwal; Andrzej Nycz; Mark Noakes; Ercan Cakmak; Peeyush Nandwana; Yukinori Yamamoto
Metal Big Area Additive Manufacturing (mBAAM) offers the potential to fabricate large scale tools at high deposition rates (15 lb/h+). 410 martensitic steel is a potential tooling material, owing to its low cost, good machinability and reasonable printability. During the mBAAM process, the shielding gas can have a significant impact on the material properties as well as the process cost. Therefore
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Investigation of the build orientation effect on magnetic properties and Barkhausen Noise of additively manufactured maraging steel 300 Addit. Manuf. (IF 7.002) Pub Date : 2020-12-30 Amanda Rossi de Oliveira; Vitor Furlan de Oliveira; Julio Carlos Teixeira; Erik Gustavo Del Conte
Additive manufacturing allows the production of complex geometries with freedom for layers construction. Build orientation causes mechanical anisotropy and may affect the crystallographic structure enabling custom-tailored properties for the product. Despite the production advantages provided by the Powder Bed Fusion (PBF) process, some inherent defects, such as porosity and residual stress need monitoring
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Variation of texture anisotropy and hardness with build parameters and wall height in directed-energy-deposited 316L steel Addit. Manuf. (IF 7.002) Pub Date : 2020-12-29 Lova Chechik; Nicholas Andrew Boone; Leigh Russell Stanger; Peter Honniball; Felicity Freeman; Gavin Baxter; Jon Raffe Willmott; Iain Todd
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A novel crack-free Ti-modified Al-Cu-Mg alloy designed for selective laser melting Addit. Manuf. (IF 7.002) Pub Date : 2020-12-31 Jinliang Zhang; Jianbao Gao; Bo Song; Lijun Zhang; Changjun Han; Chao Cai; Kun Zhou; Yusheng Shi
A novel crack-free Ti-modified Al-Cu-Mg alloy for SLM was developed here, based on the thermodynamic calculations of the crack susceptibility index and growth-restriction factor. We found that the introduction of Ti into the Al-Cu-Mg alloy effectively promoted the grain refinement and columnar-to-equiaxed grain transition as a result of the heterogeneous nucleation provided by Al3Ti precipitates. The
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Additive manufacturing of intricate and inherently photocatalytic flow reactor components Addit. Manuf. (IF 7.002) Pub Date : 2020-12-31 Adilet Zhakeyev; Mary C. Jones; Christopher G. Thomson; John M. Tobin; Huizhi Wang; Filipe Vilela; Jin Xuan
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Realizing surface amphiphobicity using 3D printing techniques: A critical move towards manufacturing low-cost reentrant geometries Addit. Manuf. (IF 7.002) Pub Date : 2021-01-06 Hamza Shams; Kanza Basit; Muhammad Ali Khan; Sajid Saleem; Asif Mansoor
Amphiphobic surfaces are obtained by lowering the surface energy through changes in surface geometry. These changes can be designed on the surface, thereby altering its wettability, and in turn rendering it amphiphobic. The main geometrical entities behind this phenomenon are reentrant geometries which prevent the solid-liquid interface tension from breaking, thereby resulting in contact angles greater
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3D printing of silk powder by Binder Jetting technique Addit. Manuf. (IF 7.002) Pub Date : 2020-12-30 Jun Zhang; Benjamin J. Allardyce; Rangam Rajkhowa; Xungai Wang; Xin Liu
This study describes for the first time the development of a silk powder-based 3D printing formulation that is compatible with Binder Jetting, a commercial additive manufacturing (AM) technique. The dynamic and bulk properties of the precursor powder were measured, including particle sizing, shape, flow energy, and compressibility, and the relationships between these properties, particle flow and printability
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Consumable development to tailor residual stress in parts fabricated using directed energy deposition processes Addit. Manuf. (IF 7.002) Pub Date : 2021-01-05 Niyanth Sridharan; Jeffrey Bunn; Michael Kottman; Chris Fancher; Andrew Payzant; Mark Noakes; Andrzej Nycz; Lonnie Love; Badri Narayanan; S.S. Babu
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A Review of Factors that Influence the Fracture Toughness of Extrusion-based Additively Manufactured Polymer and Polymer Composites Addit. Manuf. (IF 7.002) Pub Date : 2021-01-04 S. Sharafi; M.H. Santare; J. Gerdes; S.G. Advani
Fracture toughness, is a critical aspect of a component’s strength and structural integrity. In additive manufacturing (AM) of polymers and polymer composites, the fracture toughness of the manufactured part is influenced by the bonding between the layers which is dependent on the material, geometric and processing parameters. Known factors that influence the bond strength and interfacial adhesion
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Ultrasonic Nondestructive Evaluation of Laser powder bed fusion 316 L Stainless Steel Addit. Manuf. (IF 7.002) Pub Date : 2021-01-04 Changgong Kim; Houshang Yin; Andrii Shmatok; Barton C. Prorok; Xiaoyuan Lou; Kathryn H. Matlack
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Critical role of scan strategies on the development of microstructure, texture, and residual stresses during laser powder bed fusion additive manufacturing Addit. Manuf. (IF 7.002) Pub Date : 2020-12-20 Naresh Nadammal; Tatiana Mishurova; Tobias Fritsch; Itziar Serrano-Munoz; Arne Kromm; Christoph Haberland; Pedro Dolabella Portella; Giovanni Bruno
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Design of particle dampers for additive manufacturing Addit. Manuf. (IF 7.002) Pub Date : 2020-12-13 Tobias Ehlers; Sebastian Tatzko; Jörg Wallaschek; Roland Lachmayer
Damping mechanisms are a crucial factor for influencing the vibration behavior of dynamic systems. In many applications vibrations are undesirable and need to be reduced by appropriate measures. For instance, vibrations in vehicles can reduce driving comfort or in civil engineering resonance damage can occur in constructions. An interesting and cost-effective way of increasing damping is particle damping
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A parametric modelling strategy for the numerical simulation of 3D concrete printing with complex geometries Addit. Manuf. (IF 7.002) Pub Date : 2020-12-08 Ticho Ooms; Gieljan Vantyghem; Ruben Van Coile; Wouter De Corte
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On the effect of laser powder-bed fusion process parameters on quasi-static and fatigue behaviour of Hastelloy X: A microstructure/defect interaction study Addit. Manuf. (IF 7.002) Pub Date : 2020-12-25 Reza Esmaeilizadeh; Ali Keshavarzkermani; Usman Ali; Behzad Behravesh; Ali Bonakdar; Hamid Jahed; Ehsan Toyserkani
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Analysis of additively manufactured (3D printed) dual-material auxetic structures under compression Addit. Manuf. (IF 7.002) Pub Date : 2020-12-30 Ross Johnston; Zafer Kazancı
Auxetic cellular structures offer improvements in some mechanical properties due to their negative Poisson’s ratio response when loaded. This study investigates and compares the effect of using multiple materials within three well researched cellular geometries, two auxetic: re-entrant and anti- tetrachiral, and one non-auxetic: hexagonal honeycomb. For each geometry, three different material configurations
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Effect of laser-plume interaction on part quality in multi-scanner Laser Powder Bed Fusion Addit. Manuf. (IF 7.002) Pub Date : 2020-12-25 Christian Tenbrock; Tobias Kelliger; Niklas Praetzsch; Marcel Ronge; Lucas Jauer; Johannes Henrich Schleifenbaum
Using multiple laser scanner units in Laser Powder Bed Fusion (LPBF) allows a significant increase in productivity compared to single scanner systems. However, the part quality can be affected by the interaction between simultaneous melting processes. This study focuses on part defects caused by the interference between an incident laser beam and the plume ejected from an adjacent melt pool generated
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Influences of powder morphology and spreading parameters on the powder bed topography uniformity in powder bed fusion metal additive manufacturing Addit. Manuf. (IF 7.002) Pub Date : 2020-12-25 Andre Mussatto; Robert Groarke; Aidan O’Neill; Muhannad Ahmed Obeidi; Yan Delaure; Dermot Brabazon
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In-situ layerwise monitoring of electron beam powder bed fusion using near-infrared imaging Addit. Manuf. (IF 7.002) Pub Date : 2020-12-13 Guillaume Croset; Guilhem Martin; Charles Josserond; Pierre Lhuissier; Jean-Jacques Blandin; Rémy Dendievel
A near-infrared camera (NIR) is employed to monitor layer-by-layer in-situ electron beam powder bed fusion (E-PBF). We aim at demonstrating that such a device allows various kinds of flaws to be reliably captured thanks to qualitative thermal information. Defects such as distortions or uneven top surfaces can be detected in the NIR-images. Information about temperature heterogeneities can also be linked
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In situ monitoring for fused filament fabrication process: A review Addit. Manuf. (IF 7.002) Pub Date : 2020-12-17 Yanzhou Fu; Austin Downey; Lang Yuan; Avery Pratt; Yunusa Balogun
Real-time monitoring of the additive manufacturing process offers the promise of guaranteeing product quality and increasing the efficiency of the printing process. This paper summarizes research results for the in situ monitoring of the printing process for the fused filament fabrication process. To have a systematic and comprehensive summary, different methods, devices, and achievements in a range
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Development of a variable tensioning system to reduce separation force in large scale stereolithography Addit. Manuf. (IF 7.002) Pub Date : 2020-12-30 Hongtao Song; Nicholas Rodriguez; Carolyn Seepersad; Richard Crawford; Morgan Chen; Eric B. Duoss
Projection micro stereolithography (PµSL) is an additive manufacturing tool that offers multiple advantages, including unparalleled resolution and throughput, but the ability to print high viscosity resin for large-scale parts is limited. One of the key challenges in PµSL is to separate a newly polymerized layer from the vat floor without damaging the part. Since the separation force scales with the
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Predictive analytical modelling and experimental validation of processing maps in additive manufacturing of nitinol alloys Addit. Manuf. (IF 7.002) Pub Date : 2020-12-29 Jia-Ning Zhu; Evgenii Borisov; Xiaohui Liang; Eduard Farber; M.J.M. Hermans; V.A. Popovich
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Control of residual oxygen of the process atmosphere during laser-powder bed fusion processing of Ti-6Al-4V Addit. Manuf. (IF 7.002) Pub Date : 2020-12-13 C. Pauzon; K. Dietrich; P. Forêt; S. Dubiez-Le Goff; E. Hryha; G. Witt
The effect of the residual oxygen concentration in the process atmosphere during laser-powder bed fusion (L-PBF) of Ti-6Al-4V was investigated, using an external oxygen monitoring system equipped with two types of oxygen sensors typically used in L-PBF hardware: a lambda probe and an electrochemical oxygen sensor. The recordings of the oxygen variations during L-PBF highlighted that the electrochemical
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Resonant ultrasound spectroscopy for quality control of geometrically complex additively manufactured components Addit. Manuf. (IF 7.002) Pub Date : 2020-12-26 Samantha McGuigan; Andrea P. Arguelles; Anne-Francoise Obaton; Alkan M. Donmez; Jacques Riviere; Parisa Shokouhi
One of the barriers to the adoption of metal additively manufacturing by some industries is the absence of reliable part qualification procedures especially for components with complex geometries. Nondestructive evaluation (NDE) methods such as x-ray computed tomography (CT) and conventional ultrasonic testing (UT) have limitations in their abilities. X-ray CT is costly, hazardous, and offers limited
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Improving precision of material extrusion 3D printing by in-situ monitoring & predicting 3D geometric deviation using conditional adversarial networks Addit. Manuf. (IF 7.002) Pub Date : 2020-12-19 Ling Li; Ryan McGuan; Robert Isaac; Pirouz Kavehpour; Robert Candler
Material extrusion 3D printing has long been established for rapid prototyping and functional testing in many research and industry fields. However, its inconsistency and intrinsic defects (surface roughness and geometric inaccuracies) hinder its application in several areas, most notably “certify-as-you-build” small-batch prototyping and large-batch production. In this study, we present an approach
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