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Yang, Y. (author), Ayas, C. (author)The Selective laser melting (SLM) is a powder based additive manufacturing (AM) method to produce high density metal parts with complex topology. However, part distortions and accompanying residual stresses deteriorates the mechanical reliability of SLM products. Modelling of the SLM process is anticipated to be instrumental for understanding...conference paper 2017
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Yang, Y. (author), Ayas, C. (author)Selective laser melting (SLM) is a powder based additive manufacturing technique suitable for producing high precision metal parts. However, distortions and residual stresses within products arise during SLM because of the high temperature gradients created by the laser heating. Residual stresses limit the load resistance of the product and...conference paper 2017
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- Munro, D.P. (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author) abstract 2017
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- van de Ven, E.A. (author), Verboom, J.M. (author), Ayas, C. (author), Langelaar, Matthijs (author), Maas, Robert (author), van Keulen, A. (author) abstract 2017
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- Yang, Y. (author), Ayas, C. (author), van Keulen, A. (author) abstract 2017
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- Yang, Y. (author), Ayas, C. (author), van Keulen, A. (author) abstract 2017
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- van de Ven, E.A. (author), Langelaar, Matthijs (author), Ayas, C. (author), Maas, Robert (author), van Keulen, A. (author) abstract 2018
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Yang, Y. (author), Knol, Marius (author), van Keulen, A. (author), Ayas, C. (author)Selective laser melting (SLM) wherein a metal part is built in a layer-by-layer manner in a powder bed is a promising and versatile way for manufacturing components with complex geometry. However, components built by SLM suffer from substantial deformation of the part and residual stresses. Residual stresses arise due to temperature gradients...journal article 2018
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Ahmadi, S.M. (author), Ashok Kumar Jain, R. K. (author), Zadpoor, A.A. (author), Ayas, C. (author), Popovich, V. (author)Titanium and its alloys such as Ti6Al4V play a major role in the medical industry as bone implants. Nowadays, by the aid of additive manufacturing (AM), it is possible to manufacture porous complex structures which mimic human bone. However, AM parts are near net shape and post processing may be needed to improve their mechanical properties....journal article 2018
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van de Ven, E.A. (author), Maas, Robert (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author)Additive manufacturing enables the nearly uncompromised production of optimized topologies. However, due to the overhang limitation, some designs require a large number of supporting structures to enable manufacturing. Because these supports are costly to build and difficult to remove, it is desirable to find alternative designs that do not...journal article 2018
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- Ranjan, R. (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author) conference paper 2018
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Sinico, Mirko (author), Ranjan, R. (author), Moshiri, Mandana (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author), Dewulf, Wim (author), Witvrouw, Ann (author)Numerous challenges of additive manufacturing (AM) are tackled in the European Horizon 2020 project PAM^2 by studying and linking every step of the AM process cycle. For example, PAM^2 researchers from the design, processing and application side have collaborated in this work to optimise the manufacturability of metal AM parts using an improved...journal article 2019
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Nelissen, W.E.D. (author), Ayas, C. (author), Tekõglu, C. (author)The Kagome structure has been shown to be a highly suited micro-architecture for adaptive lattice materials, in which selected lattice members are replaced by actuators aiming to create shape morphing structures. It is the combination of in-plane isotropy, high stiffness and low energy requirement for actuation that makes the planar Kagome...journal article 2019
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Munro, D.P. (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author)We study linearity assumptions in the transient macroscale mechanical aspect of additive manufacturing (AM) process simulation. Linearity assumptions are often resorted to in combination with calibrated inelastic deformation components to arrive at computationally tractable yet reasonably accurate AM process models. We point out that...journal article 2019
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Sinico, M. (author), Ranjan, R. (author), Moshiri, M. (author), Ayas, C. (author), Langelaar, Matthijs (author), Witvrouw, A. (author), van Keulen, A. (author), Dewulf, W. (author)The Additive Manufacturing (AM) of injection molding inserts has gained popularity during recent years primarily due to the reduced design-to-production time and form freedom offered by AM. In this paper, Topology Optimization (TO) is performed on a metallic mold insert which is to be produced by the Laser Powder Bed Fusion (LPBF) technique....conference paper 2019
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Paggi, Umberto (author), Ranjan, R. (author), Thijs, Lore (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author), van Hooreweder, Brecht (author)In Laser Powder Bed Fusion (LPBF), the downfacing surfaces usually have increased surface roughness and reduced dimensional accuracy due to local overheating and warpage. To partially overcome this a new supporting structure is developed in this study, namely the contactless support. This is a thin blade parallel to the critical area which...conference paper 2019
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Yang, Y. (author), van Keulen, A. (author), Ayas, C. (author)Selective laser melting (SLM) is a widely used additive manufacturing method for building metal parts in a layer-by-layer manner thereby imposing almost no limitations on the geometrical layout of the part. The SLM process has a crucial impact on the microstructure, strength, surface quality and even the shape of the part, all of which depend on...journal article 2020
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van de Ven, E.A. (author), Maas, Robert (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author)It is attractive to combine topology optimization (TO) with additive manufacturing (AM), due to the design freedom provided by AM, and the increased performance that can be achieved with TO. One important aspect is to include the design rules associated with the process restrictions of AM to prevent the requirement of relatively large support...journal article 2020
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Karami, K. (author), Blok, A. (author), Weber, L.R.M. (author), Ahmadi, S.M. (author), Petrov, R.H. (author), Nikolic, Ksenija (author), Borisov, E.V. (author), Leeflang, M.A. (author), Ayas, C. (author), Zadpoor, A.A. (author), Mehdipour, M. (author), Reinton, T.E. (author), Popovich, V. (author)Additive manufacturing technologies in general and laser powder bed fusion (L-PBF) in particular have been on the rise in different applications, including biomedical implants. The effects of the various L-PBF process parameters on the microstructure and properties of Ti6Al4V lattice structures have been studied before. However, the...journal article 2020
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Ranjan, R. (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author)The powder bed fusion (PBF) process is a type of Additive Manufacturing (AM) technique which enables fabrication of highly complex geometries with unprecedented design freedom. However, PBF still suffers from manufacturing constraints which, if overlooked, can cause various types of defects in the final part. One such constraint is the local...journal article 2020
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