Thursday  |  Salon 10  |  09:00 AM–09:20 AM

#15557, Evaluation of Dynamic Behavior of Typical Triply Periodic Minimal Surface Additively-manufactured Structures

Additive manufacturing techniques are used to build easily and efficiently some architectural materials such as lattice structures without any machining constraints. By giving access to a new level of complexity at the mesoscopic scale, these technologies produce periodic structures with a unit cell sizes at the millimeter scale.
Lattices are commonly studied to release kinetic energy absorbers due to their simplicity with respect to machining process issues but they have limit for large energy absorption. However, Triply Periodic Mean Surface (TPMS) are minimal surfaces with a periodicity in three independent directions which lead to smooth and continuous structures, unlike lattice structures. Recent studies on the mechanical behaviour of several 3D printed cellular materials under compression loading had shown that sheet TPMS diamond pattern leads to better mechanical properties in terms of energy absorption performances, than most of lattice structures.
To knowledge, the TPMS are few studied at high rate of loadings so far. Thus, considering the efficiency of the TPMS to absorb energy, the aim of this paper is to investigate the dynamic behaviour of two kinds of promising patterns: diamonds and gyroid.
Firstly, experimental campaigns have been carried out with stainless steel 316L to determine stress-strain flow curves of the TPMS constitutive material using a conventional electromechanical machine, a high speed hydraulic machine and a pre-stretched bar with respect to increasing strain rates. The experiments are useful to highlight the bulked material anisotropy induced by the additive manufacturing process.
Secondly, TPMS have designed using a parameter Finite Element model to obtain a high level kinetic energy absorber. Then, absorbers have been manufactured by Selective Laser Melting (SLM) and tested under compression loadings using a conventional machine and a Split Hopkinson bars at various dynamic strain rate levels.
The experimental campaign has revealed a strong stability along the compressive loading whatever static or dynamic loading conditions.

Hervé Morvan   Hauts-de-France Polytechnic University
Grégory Haugou   Hauts-de-France Polytechnic University
Hugo Carassus   Hauts-de-France Polytechnic University
Jean-Dominique Guérin   Hauts-de-France Polytechnic University
Sandra Guérard   Arts et Métiers ParisTech
Eric Markiewicz   Hauts-de-France Polytechnic University