Influence of load orientation and of types of loads on the mechanical properties of porous Ti6Al4V biomaterials

Cuadrado, Alberto; Yáñez, Alejandro J.; Fuentes, Óscar Martel; Deviaene, S.; Monopoli, Donato

doi:10.1016/j.matdes.2017.09.045

Cited by 86 publications

(52 citation statements)

References 38 publications

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“…The resulting roughness of parts produced in an additive way is always the result of a combination of input parameters-in particular, the particle size of the powder used, melting conditions (laser power and speed, laser scanning strategy, layer height), or orientation of the produced part relative to the building platform [6,32,33]. The roughness affects implant-bone interaction, the friction coefficient, osseointegration process [3,34] (especially in porous structures [4][5][6][7]), and the fatigue life of the product [11]. Liu [1] notes that the roughness is affected by several factors: (1) the staircase effect related to the subsequently deposited layers; (2) the attachment of the partly melted particles to the surface, and (3) the presence of pores and other imperfections close to surface.…”

Section: Roughness Of Materialsmentioning

confidence: 99%

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The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

Guzanová

Draganovská

Ižaríková

et al. 2019

Metals

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This article is focused on the effect of position on a build platform on the hardness, roughness and corrosion rate of parts (Ti6Al4V) produced by direct metal laser sintering (DMLS) technology. During the sintering process, the test samples were located at key positions—at the corners and in the middle of the build platform. An experimental program started with a microstructure investigation in two perpendicular directions in individual positions. The selected mechanical property—hardness—was investigated on metallographic cuts in both directions and all positions, and data sets underwent a statistical analysis (analysis of variance (ANOVA), t-test, F-test). The same procedure was repeated for an assessment of position effect to surface roughness (Kruskal–Wallis test) and material corrosion resistance. On the build platform, the course of hardness, roughness, and corrosion rate values that can be expected in individual positions was mapped in detail.

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Section: Roughness Of Materialsmentioning

confidence: 99%

“…[1]. The selected properties of the products can largely be altered by a controlled porosity from almost compact material to scaffold structures [2][3][4][5][6]. In addition, it is possible to design the appropriate shape of the individual scaffold cells as well as their orientation with respect to the stresses of the product [7].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

Guzanová

Draganovská

Ižaríková

et al. 2019

Metals

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“…The average diameter of lattice struts has been observed to significantly deviate from the initial design, as shown in Table 2, where both over-and under-sizing have been observed. Cuadrado et al [63] and Arabnejad et al [59] show strut diameter to be significantly affected by strut orientation, where vertically oriented struts were under-sized by up to 45%, and horizontal struts were over-sized by over 100%. Cuadrado et al [63] linked deviations in strut diameter to the overall volume fraction of lattice structures, observing a volume fraction less than designed in lattice structures consisting of a significant portion of vertical struts, with the opposite occurring in designs with more horizontal struts.…”

Section: Dimensional Inaccuraciesmentioning

confidence: 99%

“…Cuadrado et al [63] and Arabnejad et al [59] show strut diameter to be significantly affected by strut orientation, where vertically oriented struts were under-sized by up to 45%, and horizontal struts were over-sized by over 100%. Cuadrado et al [63] linked deviations in strut diameter to the overall volume fraction of lattice structures, observing a volume fraction less than designed in lattice structures consisting of a significant portion of vertical struts, with the opposite occurring in designs with more horizontal struts. Zhang et al observed similar orientation-dependent thickness variations in sheet TPMS unit cells (primitive, diamond, gyroid) [60].…”

Section: Dimensional Inaccuraciesmentioning

confidence: 99%

“…Hildebrand and Rüegsegger [99] highlight additional parameters useful for characterising lattice structures with XCT, for example the ratio of surface area to volume which could allow for a comparison of attached particles in multiple samples. Dimensional measurements have been performed using XCT [98,100], SEM [11,13,68,69,73,[85][86][87][101][102][103] and optical microscopy [25,36,63,75,76,[104][105][106]. It is also relatively common to use Vernier callipers for the measurement of outer dimensions (for example, lattice diameter, length, width) [74,103,104,107].…”

Section: Quality Inspection Of Lattice Structuresmentioning

confidence: 99%

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Review of defects in lattice structures manufactured by powder bed fusion

Echeta

Feng

Dutton

et al. 2019

Int J Adv Manuf Technol

158

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Additively manufactured lattice structures are popular due to their desirable properties, such as high specific stiffness and high surface area, and are being explored for several applications including aerospace components, heat exchangers and biomedical implants. The complexity of lattices challenges the fabrication limits of additive manufacturing processes and thus, lattices are particularly prone to manufacturing defects. This paper presents a review of defects in lattice structures produced by powder bed fusion processes. The review focuses on the effects of lattice design on dimensional inaccuracies, surface texture and porosity. The design constraints on lattice structures are also reviewed, as these can help to discourage defect formation. Appropriate process parameters, post-processing techniques and measurement methods are also discussed. The information presented in this paper contributes towards a deeper understanding of defects in lattice structures, aiming to improve the quality and performance of future designs.

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Effects of Unit Cell Topology on the Mechanical Properties of Porous Tantalum Structures via Laser Powder Bed Fusion

Yang

et al. 2023

Adv Eng Mater

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Additive manufacturing (AM) of porous tantalum scaffolds receives extensive attention because the demands for tantalum implants grow rapidly. Understanding the effects of unit cell topology on the mechanical properties of porous tantalum scaffold structures is critical for durable implant design, but it is still lacking. Herein, porous tantalum structures with two types of unit cells (body‐centered cubic [BCC] and body‐centered cubic deformation [BCC‐D]) are additively manufactured with laser powder bed fusion (LPBF). The geometric characteristics and mechanical properties of the manufactured structures are comparatively studied. It is found that the mechanical properties of BCC porous tantalum in the building and horizontal directions are discovered to be nearly identical, with elastic modulus and yield strength of nearly 1.9 GPa and 56 MPa, respectively. Unit cell topology dominates the mechanical anisotropy and compressive failure mode of porous tantalum. The mechanical properties of the BCC‐D topology are anisotropic, and the fracture morphology indicates that it is a cleavage fracture and a minor ductile fracture. The capacity to finely control the mechanical properties of porous tantalum structure through unit cell topology is prominent for optimizing implant structure for personalized medical care.

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Influence of load orientation and of types of loads on the mechanical properties of porous Ti6Al4V biomaterials

Cited by 86 publications

References 38 publications

The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

The Effect of Position of Materials on a Build Platform on the Hardness, Roughness, and Corrosion Resistance of Ti6Al4V Produced by DMLS Technology

Review of defects in lattice structures manufactured by powder bed fusion

Effects of Unit Cell Topology on the Mechanical Properties of Porous Tantalum Structures via Laser Powder Bed Fusion

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