Understanding elastic anisotropy in diamond based lattice structures produced by laser powder bed fusion: Effect of manufacturing deviations

Alaña, Markel; Cutolo, Antonio; Probst, Gabriel; Galarreta, Sergio Ruiz de; Hooreweder, Brecht Van

doi:10.1016/j.matdes.2020.108971

Cited by 22 publications

(6 citation statements)

References 20 publications

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“…Nevertheless, the quasi-elastic gradients of the numerical models are far from the experimental values obtained. It is common to have significant differences between numerically and experimentally obtained mechanical properties of lattice structures, since numerical models neglect many imperfections that reduce the stiffness of lattices, and can even cause changes in their anisotropy 38 , 39 . These imperfections include the dross formation, the waviness of struts, the surface roughness, internal porosity, among others, and were not considered in the numerical models.…”

Section: Resultsmentioning

confidence: 99%

Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion

Alaña

Cutolo

Galarreta

et al. 2021

Sci Rep

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Lattice structures produced by additive manufacturing have been increasingly studied in recent years due to their potential to tailor prescribed mechanical properties. Their mechanical performances are influenced by several factors such as unit cell topology, parent material and relative density. In this study, static and dynamic behaviors of Ti6Al4V lattice structures were analyzed focusing on the criteria used to define the failure of lattices. A modified face-centered cubic (FCCm) lattice structure was designed to avoid the manufacturing problems that arise in the production of horizontal struts by laser powder bed fusion. The Gibson–Ashby curves of the FCCm lattice were obtained and it was found that relative density not only affects stiffness and strength of the structures, but also has important implications on the assumption of macroscopic yield criterion. Regarding fatigue properties, a stiffness based criterion was analyzed to improve the assessment of lattice structure failure in load bearing applications, and the influence of relative density on the stiffness evolution was studied. Apart from common normalization of S–N curves, a more accurate fatigue failure surface was developed, which is also compatible with stiffness based failure criteria. Finally, the effect of hot isostatic pressing in FCCm structures was also studied.

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Section: Resultsmentioning

confidence: 99%

Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion

Alaña

Cutolo

Galarreta

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…These dimensional discrepancies will have a direct effect on the mechanical response, since the deformation mechanisms depend on the geometrical features (i.e., length, strut thickness, an cross-sectional area). In a work by Alaña et al, the LPBF-produced structures with a diamond unit cell featured a significant change in the elastic anisotropy due to the fact of manufacturing imperfections [ 42 ].…”

Section: Discussionmentioning

confidence: 99%

Mechanical Properties of AISI 316L Lattice Structures via Laser Powder Bed Fusion as a Function of Unit Cell Features

et al. 2023

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The growth of additive manufacturing processes has enabled the production of complex and smart structures. These fabrication techniques have led research efforts to focus on the application of cellular materials, which are known for their thermal and mechanical benefits. Herein, we studied the mechanical behavior of stainless-steel (AISI 316L) lattice structures both experimentally and computationally. The lattice architectures were body-centered cubic, hexagonal vertex centroid, and tetrahedron in two cell sizes and at two different rotation angles. A preliminary computational study assessed the deformation behavior of porous cylindrical samples under compression. After the simulation results, selected samples were manufactured via laser powder bed fusion. The results showed the effects of the pore architecture, unit cell size, and orientation on the reduction in the mechanical properties. The relative densities between 23% and 69% showed a decrease in the bulk material stiffness up to 93%. Furthermore, the different rotation angles resulted in a similar porosity level but different stiffnesses. The simulation analysis and experimental results indicate that the variation in the strut position with respect to the force affected the deformation mechanism. The tetrahedron unit cell showed the smallest variation in the elastic modulus and off-axis displacements due to the cell orientation. This study collected computational and experimental data for tuning the mechanical properties of lattice structures by changing the geometry, size, and orientation of the unit cell.

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“…The bead width of each print line is 0.4 mm, and the layer thickness of the PEEK filler is 0.2 mm. The first task is constructing custom implants with the human femur's high mechanical strength as an alternative to standard implants [27][28][29]. These implants are made directly in PEEK using AM equipment from a virtual model generated in Mountain 8 Premium package.…”

Section: Methodsmentioning

confidence: 99%

Mechanical performances of hip implant design and fabrication with PEEK composite

Oladapo

Zahedi

Ismail

2021

Polymer

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Understanding elastic anisotropy in diamond based lattice structures produced by laser powder bed fusion: Effect of manufacturing deviations

Cited by 22 publications

References 20 publications

Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion

Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion

Mechanical Properties of AISI 316L Lattice Structures via Laser Powder Bed Fusion as a Function of Unit Cell Features

Mechanical performances of hip implant design and fabrication with PEEK composite

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