Low-cycle fatigue behavior of 3D-printed metallic auxetic structure. (2020)

• Record Type: Journal Article
• Authors: Lvov, V.A.; Senatov, F.S.; Stepashkin, A.A.; Veveris, A.A.; Pavlov, M.D.; Komissarov, A.A.
• Is Part Of: Materials today. Volume 33:Part 4(2020)
• Page Start: 1979
• Page End: 1983
• Publication Date: 2020
• Subjects: Auxetic -- Cycle loading -- Deformation and fracture -- Simulation and modeling -- 3D-printing; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2020.06.130
• Languages: English
• ISSNs: 2214-7853

Abstract

Highlights: Auxetic and non-auxetic structures were tested for low cycle compression fatigue. Auxetic structure shows good ability to withstand cyclic loads. Auxetic structure is uniformly deformed during static test and FEA of static test simulation. Abstract: Auxetics occupy a special place among structural products working under cyclic loads, such as orthopedic implants, elements of building structures, etc. In this work, a three-dimensional auxetic structure (with Poisson's ratio of −0.450) was proposed and the mechanical characteristics were analyzed using static and low-cycle compression tests (up to 2000 cycles) by both testing physical samples obtained by 3D-printing using SLM method and by running a computer simulation (FEA). The studied properties of auxetics were compared with the properties of a non-auxetic hexagonal honeycomb structure. It has been demonstrated that the auxetic structure is deformed uniformly during cyclic tests with a maximum load of 12 kN at a failure; accordingly, a non-auxetic structure loses stability at a load of 8 kN. The results can be used in the development of structural elements of biomedical devices operating under increased cyclic loads (spinal implants, bone implants for supporting limbs).