Publications by Nikola Kalentics

Damping of flexure blades based on bi-material additive manufacturing

Simon Nessim Henein, Florent Cosandier, Nicolas Blondiaux, Elias Sebastian Klauser, Loïc Benoît Tissot-Daguette, Nikola Kalentics, Lisa Salamin, Florent Alexandre Boudoire

Flexure-based mechanisms have become state-of-the-art solutions for the design of high-precision mechanisms, free from friction wear, backlash, and lubrication. These properties which are necessary for applications in ultraclean or harsh environments, neve ...

2023

Bragg edge tomography characterization of additively manufactured 316L steel

Christian Leinenbach, Roland Logé, Nikola Kalentics, Efthymios Polatidis, Markus Strobl

In this work we perform a neutron Bragg edge tomography of stainless steel 316L additive manufacturing samples, one as built via standard laser powder bed fusion, and one using the novel three-dimensional (3D) laser shock peening technique. First, we consi ...

AMER PHYSICAL SOC2022

Laser treatment systems and methods for in-situ laser shock peening (lsp) treatment of parts during production thereof by a selective laser sintering or melting (sls/slm) process, and additive manufacturing systems and methods implementing the same

Roland Logé, Nikola Kalentics

There is described, in accordance with a first aspect of the invention, a laser treatment system and method for, in particular, imparting beneficial residual stresses into a desired part (P) during production thereof by a Selective Laser Sintering or Melti ...

2021

Nondestructive characterization of laser powder bed fusion parts with neutron Bragg edge imaging

Christian Leinenbach, Roland Logé, Nikola Kalentics, Markus Strobl

Laser powder bed fusion is an efficient technique for additive manufacturing of metallic materials. The quality of the material produced depends on the optimization of a large range of build parameters and the complex thermo-mechanical build process is pro ...

ELSEVIER2021

A parametric neutron Bragg edge imaging study of additively manufactured samples treated by laser shock peening

Christian Leinenbach, Roland Logé, Nikola Kalentics, Markus Strobl

Laser powder bed fusion is an additive manufacturing technique extensively used for the production of metallic components. Despite this process has reached a status at which parts are produced with mechanical properties comparable to those from conventiona ...

Nature Portfolio2021

Investigation of the effect of Laser Shock Peening in Additively Manufactured samples through Bragg Edge Neutron Imaging

Roland Logé, Nikola Kalentics, Markus Strobl

Additive manufacturing is a promising and rapidly rising technology in metal processing. However, besides a number of key advantages the constitution of a part through a complex thermo-mechanical process implies also some severe issues with the potential o ...

ELSEVIER2020

3D laser shock peening - A new method for improving fatigue properties of selective laser melted parts

Christian Leinenbach, Manuel Ortega Varela De Seijas, Roland Logé, Nikola Kalentics

Although Selective Laser Melting (SLM) currently revolutionizes the way parts are being manufactured, certain process inherent limitations such as accumulation of residual stresses and increased porosity content can lead to a decrease in fatigue life of pr ...

ELSEVIER2020

3D laser shock peening as a way to improve geometrical accuracy in selective laser melting

Andreas Burn, Michael Cloots, Roland Logé, Nikola Kalentics

One of the major drawbacks of selective laser melting (SLM) is the accumulation of tensile residual stresses (TRS) in the surface and subsurface zones of produced parts which can lead to cracking, delamination, geometrical distortions, and a decrease in fa ...

SPRINGER LONDON LTD2019

Laser shock peening: A promising tool for tailoring metallic microstructures in selective laser melting

Valerio Romano, Andreas Burn, Manuel Ortega Varela De Seijas, Roland Logé, Ke Huang, Nikola Kalentics

Metallic parts made by Selective Laser Melting (SLM) are known for their heterogeneous microstructures in the as-built (AB) state. In this paper, Laser Shock Peening (ISP) was performed on a 316 L stainless steel part fabricated by SLM. The LSP treatment i ...

2019

Healing cracks in selective laser melting by 3D laser shock peening

Jamasp Jhabvala, Andreas Burn, Christian Leinenbach, Roland Logé, Nikola Kalentics, Hossein Ghasemi Tabasi, Navid Sohrabi

Selective Laser Melting (SLM) of Ni-based superalloys such as CM247LC is prone to weld-cracking. This paper investigates how to suppress cracks by repeatedly applying Laser Shock Peening (LSP) during the building phase of SLM. Samples made of CM247LC were ...

ELSEVIER2019

A new hybrid Additive Manufacturing process combining Selective Laser Melting and Laser Shock Peening

Nikola Kalentics

Additive Manufacturing (AM) in whole and especially Selective Laser Melting (SLM) are already making a revolution in the way parts are designed and manufactured with the ability to produce lightweight parts with unprecedented complex geometries which are o ...

EPFL2018

Tailoring residual stress profile of Selective Laser Melted parts byLaser Shock Peening

Eric Boillat, Roland Logé, Nikola Kalentics

The paper describes a new approach in controlling and tailoring residual stress profile of parts made bySelective Laser Melting (SLM). SLM parts are well known for the high tensile stresses in the as – built statein the surface or subsurface region. These ...

2017

Method and Device for Implementing Laser Shock Peening or Warm Laser Shock Peening During Selective Laser Melting

Eric Boillat, Roland Logé, Nikola Kalentics

A method for manufacturing an object including the steps of forming layers by adding successive layers of material to form the object by selective laser melting (SLM), and inducing plastic deformation and residual stress into solidified material of at leas ...

2017

3D Laser Shock Peening – A new method for the 3D control of residual stresses in Selective Laser Melting

Eric Boillat, Jamasp Jhabvala, Christian Leinenbach, Roland Logé, Nikola Kalentics

This paper describes a hybrid additive manufacturing process – 3D Laser Shock Peening (3D LSP), based on the integration of Laser Shock Peening (LSP) with selective laser melting (SLM). The well-known tensile residual stresses (TRS) in the as – built (AB) ...

Elsevier Sci Ltd2017

Method and device for fabrication of 3d multi - material (composite) parts by selective laser melting combined with laser welding and cutting

Roland Logé, Nikola Kalentics

The method of manufacturing objects made of a first primary material such as ceramic, metallic or polymer materials on at least one workstation by selective laser melting (SLM) comprises the addition of at least a secondary material different from the prim ...

2017