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Computational design of architectured materials with tailored instabilities

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Français - Anglais

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General information

Reference : UMR8006-JUSDIR-002
Workplace : PARIS 13
Date of publication : Monday, February 24, 2020
Scientific Responsible name : Justin DIRRENBERGER
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2020
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

Architectured materials are a new class of engineering materials obtained via a design process aiming at fulfilling a given set of requirements through functionality, behavior, or performance induced by a specific morphological arrangement between multiple phases. Specifically, 2D and 3D micro-trusses represent a subset of architectured materials with high potential in terms of effective properties. Such architectured materials are subject to buckling instabilities as it is one of the main modes of failure, due to slender elements in their architecture, e.g. struts.

It is common engineering practice to avoid such buckling in mechanical design; nevertheless, buckling is not necessarily catastrophic, and post-buckling functionality is sometimes possible. So-called “meso-buckling” can actually be developed, e.g. for controlling functional properties of architectured materials. For instance, it has been shown in the literature that post-buckling resilience of honeycombs can be enhanced by introducing hierarchy in their architecture [1].

Moreover, architectured materials densifying through buckling have recently been designed [2]. Such a phenomenon, if controlled, could enable predefined alterations of behavior through the application of external loads.

The main objective of the current project is to model such peculiar behavior through an analytical and computational approach. Experimental validation will be performed in collaboration with partners from the ANR MAX-OASIS consortium. A second objective is to implement a design methodology for architectured materials exploiting this type of additional mechanical behavior.

Keywords: architectured materials, buckling, computational mechanics of materials & structures, finite element analysis, mechanical design.

References:
[1] Combescure, C., & Elliott, R. S. (2017). Hierarchical honeycomb material design and optimization: Beyond linearized behavior. International Journal of Solids and Structures, 115, 161-169.
[2] Coulais, C., Sabbadini, A., Vink, F., & van Hecke, M. (2018). Multi-step self-guided pathways for shape-changing metamaterials. Nature, 561(7724), 512-515.

Work Context

Laboratoire PIMM, Arts et Métiers, Cnam, CNRS, 151 bd de l'Hôpital, 75013 Paris, France.

Background of the candidate: computational mechanics, mechanical engineering, applied physics, materials science or any other relevant field.

Constraints and risks

No specific constraints.

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