Quasi‐static compression and compression–compression fatigue behavior of regular and irregular cellular biomaterials

Abstract

The main aim of the current study is to evaluate the compressive quasi‐static and fatigue properties of titanium alloy (Ti6Al4V) cellular materials, with different topologies, manufactured via laser powder bed fusion (LPBF) process. The topologies herein considered are lattice‐based regular and irregular configurations of cubic, star, and cross‐shaped unit cell along with trabecular‐based topology. The results have indicated that the effective stiffness of all configurations are in the range of 0.3–20 GPa, which is desirable for implant applications. The morphological irregularities in the structures induce bending‐dominated behavior affecting more the topologies with vertical struts. The S–N curves normalized with respect to the yield stress indicate that the behavior of star regular structures is between purely stretching‐dominated cubic and purely bending‐dominated cross‐based structures. Trabecular structures have shown desirable quasi‐static and fatigue properties despite the random distribution of struts.

From Brittle to Ductile: Symmetry Breaking in Strut-Based Architected Materials

“…This feature, however, poses a drawback in the case of brittle constituents: when one unit cell fails, the other unit cells will successively fail under critical compression loading, causing a sudden and catastrophic failure in the structure . This detrimental failure mode prevents early detection of failure, prompting the development of asymmetric cellular materials, which are materials consisting of heterogeneous microstructures. − …”

Fracture toughness of a rigid polyurethane foam: experimental and numerical investigation by varying the specimen sizes

“…Cellular materials are nowadays very popular materials due to lightweight, efficient, and superior design for engineering structures, 1 with applications in different fields such as defense, healthcare, automotive, construction, and aerospace, 2 and used both as a stand-alone material and in combination to other ones to form composites. 3 They can be classified into natural and man-made (manufactured) cellular materials.…”

Investigation of the Compressive Properties of Three-Dimensional Voronoi Reticula

“…First notable publications on the subject have been authored between 2015 and 2018, when G. Maliaris et al studied experimentally and numerically the response of Voronoi lattices exploiting investment casting techniques for A1100 aluminium and AISI304 steel (Maliaris et al, 2016) and SLA (Stereolithography) additive technologies for the Asiga PlasGRAY photopolymer (Maliaris and Sarafis, 2017); to the authors' knowledge, these studies remain today the only analyses based on solid-meshed numerical models, even if it was later chosen to abandon such technique in favour of homogenization solutions (Maliaris et al, 2018). Later, comparison with regular topologies was provided for the mechanical properties of additively manufactured Al6101, Ti6Al4V and AlSi10Mg lattices (Mueller et al, 2019;Raghavendra et al, 2021;Shinde et al, 2022), while thermal behaviour of Ti6Al4V specimens was analysed in another notable study (Zhang et al, 2021). More recently, effects of irregularities in PA12 samples were investigated (Okubo et al, 2023).…”