Abstract
The mechanical response of additively-manufactured hollow truss lattices is experimentally investigated under quasi-static compression testing. Exploiting the recent developments in the Fusing Deposition Modelling (FDM) technique, two families of lattices have been fabricated, obtained as tessellation in space of octet-truss and diamond unit cells. Four specimens for each family of lattices have been designed with prescribed relative density, selecting different inner-to-outer radius ratios r/R of their hollow struts. Compression experiments prove that mechanical properties and failure mechanisms of hollow truss lattices are significantly dependent on the r/R ratio. In particular, a shift from quasi-brittle to ductile mechanical response at increasing r/R values has been revealed for the octet-truss lattice, leading to a stable collapse mechanism and increased energy absorption capacity. On the other hand, a more compliant behaviour has been observed in the diamond lattice response, with a monotonic improvement of mechanical properties as a function of the r/R ratio. Such results substantiate the potentialities of additively-manufactured hollow lattice structures as an attractive solution when lightweight, resistant and efficient energy absorption materials are required.Graphic
Highlights
In the last two decades, prompted by the rapid advances in Additive Manufacturing (AM) technologies, metamaterials or Micro-Architected Materials (MAMs) have attracted enormous interest for their multi-functional purposes and engineering applications [1–6], offering a potentially effective alternative to stochastic materials like foams or honeycomb structures
The present study aims to investigate the mechanical behaviour under a compressive load of octet-truss and diamond lattices manufactured via Fused Deposition Modelling (FDM)
The present study aims to investigate the compressive response of hollow lattice structures with octet-truss or diamond unit cells
Summary
In the last two decades, prompted by the rapid advances in Additive Manufacturing (AM) technologies, metamaterials or Micro-Architected Materials (MAMs) have attracted enormous interest for their multi-functional purposes and engineering applications [1–6], offering a potentially effective alternative to stochastic materials like foams or honeycomb structures. Among MAMs, periodic lattices are by far the most widespread [7] They are characterised by a unit cell at the micro-scale, which is repeated along three orthogonal axes to form a periodic structure at the. According to the unit cell topology, and to the nodal connectivity, truss-lattices are generally divided into two macro-categories [2]: stretching-dominated, whose behaviour is mainly governed by axial stresses, and bendingdominated, in which bending stresses are predominant. The. The International Journal of Advanced Manufacturing Technology (2022) 120:3529–3541 former are characterised by a large overall structural loadbearing capacity, with high strength and stiffness-to-weight ratios. The International Journal of Advanced Manufacturing Technology (2022) 120:3529–3541 former are characterised by a large overall structural loadbearing capacity, with high strength and stiffness-to-weight ratios They find applications in the automotive, aerospace and construction industries and are employed as support structures in tissue engineering and bioprinting. Bending-dominated lattices have a more compliant behaviour, featuring a long stress plateau under compressive load and significant energy absorption capacity
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