DS0303 -

Laser Design of Superelastic Materials – ALMARIS

Submission summary

The main objective of the project is to design and manufacture, using selective laser melting (SLM) process, periodic metallic structures able to deform collectively in a reversible manner, thus yielding enhanced mechanical damping properties and flexibility. Although this layer-by-layer processing route offers flexibility in terms of design for architecture metallic materials, several scientific and technological challenges remain to be tackled in order to generate favorable architecture effects within the materials, e.g. auxetic effect and mechanical metamaterial behaviour. The optimization proposed for the material/architecture/process triptyque is the result from a materials-by-design approach which relies on the development of both numerical and experimental tools. Beyond the elasticity of metallic architectures, the project aims at exploiting properties of NiTi shape-memory alloy in order to increase the amplitude of elastic strain, as well as the actuating behaviour.

The original contribution of the ALMARIS project is to consider the whole process of elaboration of SLM-made components, from powder atomization and shape optimization of the cells, to the metallurgy of the constitutive materials, towards the production and characterization of a demonstrator. Two materials are proposed within the project: on one hand, Ni-base superalloy (Inconel® 625) for which metallurgical behaviour is well known for SLM; on the other hand, a quasi-stoichiometric NiTi shape-memory alloy for which SLM process and post-treatment developments are needed in order to achieve superelasticity. Tackling the technological and scientific challenges inherent to the project will involve various skills and know-hows regarding metallurgy, microstructural and mechanical characterization, constitutive behaviour modelling, computational mechanics, topological optimization, and residual stresses analysis based on full-field measurements.

ALMARIS can be broken down into 6 work-Packages:
- WP 0 : Project management
- WP 1 : SLM process development
- WP 2 : Investigation of superelasticity
- WP 3 : Mechanical characterization
- WP 4 : Modeling and topology optimization
- WP 5 : Validation on a superelastic architectured demonstrator

The consortium consists of Onera the French aerospace Lab, the Center of Materials (CdM) of the National School les Mines, of the laboratory of Processes and Engineering in Mechanics and Materials (PIMM) of Arts et Métiers, laboratory of Mechanical Systems and Simultaneous Engineering ( LASMIS) of the University of Technology of Troyes, and the company Poly-Shape.

Project coordinator

Madame Cécile Davoine (French Aerospace Lab - ONERA PALAISEAU)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.


UTT/ICD-LASMIS LAboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée (LASMIS) de l'Université de Technologie de Troyes
PIMM Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
ARMINES ARMINES Centre des Matériaux de Mines ParisTech

Help of the ANR 685,590 euros
Beginning and duration of the scientific project: September 2016 - 48 Months

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