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Stress Concentration and Mechanical Strength of Cubic Lattice Architectures

Article dans une revue avec comité de lecture
Author
LOHMULLER, Paul
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
243747 Labex DAMAS
104710 Institut Jean Lamour [IJL]
FAVRE, Julien
22126 Centre Science des Matériaux et des Structures [SMS-ENSMSE]
209650 Laboratoire Georges Friedel [LGF-ENSMSE]
PIOTROWSKI, Boris
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
KENZARI, Samuel
104710 Institut Jean Lamour [IJL]
LAHEURTE, Pascal
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
243747 Labex DAMAS

URI
http://hdl.handle.net/10985/14096
DOI
10.3390/ma11071146
Date
2018
Journal
Materials

Abstract

The continuous design of cubic lattice architecture materials provides a wide range of mechanical properties. It makes possible to control the stress magnitude and the local maxima in the structure. This study reveals some architectures specifically designed to reach a good compromise between mass reduction and mechanical strength. Decreased local stress concentration prevents the early occurrence of localized plasticity or damage, and promotes the fatigue resistance. The high performance of cubic architectures is reported extensively, and structures with the best damage resistance are identified. The fatigue resistance and S–N curves (stress magnitude versus lifetime curves) can be estimated successfully, based on the investigation of the stress concentration. The output data are represented in two-dimensional (2D) color maps to help mechanical engineers in selecting the suitable architecture with the desired stress concentration factor, and eventually with the correct fatigue lifetime.

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