Experimental investigation of rhombic dodecahedron micro-lattice structures manufactured by Electron Beam Melting

Palomba, Giulia; D’Andrea, Danilo; Bella, Santo Di; Mineo, Rosalia; Guglielmino, Eugenio; Traina, Francesco

doi:10.1016/j.matpr.2018.12.011

Cited by 15 publications

(12 citation statements)

References 16 publications

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“…Epasto et al [84] studied rhombic dodecahedron lattice structures and the effect of unit cell size. After the conduction of the compressive tests, it was possible to conclude that with a decrease of the cell size both the compressive strength and Young's modulus increases.…”

Section: Compressive Behaviour Of the Lattice Structure: Experimental And Numerical Modelsmentioning

confidence: 99%

“…Focusing only on one AM technique, Epasto et al [84] studied the effect of surface roughness on the mechanical performance of the Ti-6Al-4V bulk specimens made by EBM. To investigate this particular effect, some of the fabricated specimens were machined.…”

Section: Effect Of the Precision Of The Ebm Process And The Surface Roughness On The Mechanical Propertiesmentioning

confidence: 99%

“…As far as the effects of heat treatments on the mechanical behaviour of Ti-6Al-4V lattice structures made by EBM is concerned, only a few works have been found in the literature that addressed this topic. Epasto et al [84] studied the effect of thermal treatments on the compressive behaviour with the aim to investigate whenever there is an effect of residual stresses on EBM components. Thus, stress relief was performed on some specimens which were heated up to 300 °C; this temperature was maintained for 3 h, and then, the specimens were cooled down in the furnace.…”

Section: Effects Of Thermal Treatments On the Mechanical Behaviour Of Ti-6al-4v Alloy Made By Ebmmentioning

confidence: 99%

“…Results of tensile tests for both as-built and machined conditions from the study by Epasto et al[84] …”

mentioning

confidence: 99%

See 3 more Smart Citations

Microstructure and Mechanical Performance of Ti–6Al–4V Lattice Structures Manufactured via Electron Beam Melting (EBM): A Review

Del

Galati

Saboori

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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Electron beam melting (EBM) process is an additive manufacturing process largely used to produce complex metallic components made of high-performance materials for aerospace and medical applications. Especially, lattice structures made by Ti-6Al-4V have represented a hot topic for the industrial sectors because of having a great potential to combine lower weights and higher performances that can also be tailored by subsequent heat treatments. However, the little knowledge about the mechanical behaviour of the lattice structures is limiting their applications. The present work aims to provide a comprehensive review of the studies on the mechanical behaviour of the lattice structures made of Ti-6Al-4V. The main steps to produce an EBM part were considered as guidelines to review the literature on the lattice performance: (1) design, (2) process and (3) post-heat treatment. Thereafter, the correlation between the geometrical features of the lattice structure and their mechanical behaviour is discussed. In addition, the correlation among the mechanical performance of the lattice structures and the process precision, surface roughness and working temperature are also reviewed. An investigation on the studies about the properties of heat-treated lattice structure is also conducted.

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Section: Compressive Behaviour Of the Lattice Structure: Experimental And Numerical Modelsmentioning

confidence: 99%

Section: Effect Of the Precision Of The Ebm Process And The Surface Roughness On The Mechanical Propertiesmentioning

confidence: 99%

Section: Effects Of Thermal Treatments On the Mechanical Behaviour Of Ti-6al-4v Alloy Made By Ebmmentioning

confidence: 99%

“…Results of tensile tests for both as-built and machined conditions from the study by Epasto et al[84] …”

mentioning

confidence: 99%

See 2 more Smart Citations

Microstructure and Mechanical Performance of Ti–6Al–4V Lattice Structures Manufactured via Electron Beam Melting (EBM): A Review

Del

Galati

Saboori

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…SLM technology, which is one of the advanced AM processes, is widely used in manufacturing metal porous structures due to its short process cycle and wide molding range [ 9 ]. The ordered porous structures with different cells, such as rhombic dodecahedron [ 10 ], octahedral [ 11 ], diamond [ 12 ] cubic [ 12 ], body-centered cubic [ 13 ], crystal-line lattice [ 14 ], and honeycomb [ 15 ], have been developed and widely concerned in previous work. These studies mainly focus on the effect of cellular structures on mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Internal Microstructure Distribution on Quasi-Static Compression Behavior and Energy Absorption of Hollow Truss Structures

2020

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In this work, hollow truss structures with different internal microstructure distributions, i.e., basic hollow truss structure (specimen HT), hollow truss structure with internal microstructure at joints (specimen HTSJ), and hollow truss structure with internal microstructure on tube walls (specimen HTSW), were designed and manufactured using a selective laser melting technique. The effect of internal microstructure distribution on quasi-static compressive behavior and energy absorption was investigated by experimental tests and numerical simulations. The experimental results show that compressive strength and specific compressive strength of specimen HTSW increase by nearly 50% and 14% compared to specimen HT, and its energy absorption per volume and mass also increase by 52% and 15% at a strain of 0.5, respectively. However, the parameters of specimen HTSJ exhibit limited improvement or even a decrease in different degrees in comparison to specimen HT. The numerical simulation indicates that internal microstructures change the bearing capacity and structural weaknesses of the cells, resulting in the different mechanical properties and energy absorptions of the specimens. Based on the internal microstructure design in this study, adding microstructures into the internal weaknesses of the cells parallel to the loading direction is an effective way to improve the compressive properties, energy absorption and compressive stability of hollow truss structures.

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Mechanical Characteristics of Architected Polycrystal Lattice Affected by the Orientation of Metagrain Boundary

Chen

Cui

et al. 2023

Adv Eng Mater

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The orientation of internal metagrain boundary shows an important influence on shearing behaviors and mechanical performance of architected polycrystal lattice. This study designs four types of architected polycrystal lattices equipped with single boundary, multiple parallel boundaries, or multiple intersecting boundaries, with boundary orientations of 0°, 26.55°, 45°, 63.45°, or 90°. The compressive responses of these architected polycrystal lattices are investigated to reveal the effects of the boundary orientations. Especially the relations between the shearing deformation and the boundary orientation are clarified, and the underlying shearing mechanisms are discussed to provide a basis for predicting and explaining the energy absorbing capacity in the architected polycrystal lattice. For the architected polycrystal lattice consisting of +30° and −30° orientated metagrains with intrinsic shear bands of 60° and 75°, the 75° rather than 60° shear band is more likely to occur when the angle of the architected polycrystal boundary increases from 0° to 90°. Most importantly, the higher energy absorption prefers the shear band more horizontal and shorter, which can be realized by increasing the angle and the number of grain boundaries. This contributes to resisting catastrophic failure for lattice structures. These findings provide guidance for developing novel lattice structures with well‐controlled mechanical characteristics.

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Experimental investigation of rhombic dodecahedron micro-lattice structures manufactured by Electron Beam Melting

Cited by 15 publications

References 16 publications

Microstructure and Mechanical Performance of Ti–6Al–4V Lattice Structures Manufactured via Electron Beam Melting (EBM): A Review

Microstructure and Mechanical Performance of Ti–6Al–4V Lattice Structures Manufactured via Electron Beam Melting (EBM): A Review

Effect of Internal Microstructure Distribution on Quasi-Static Compression Behavior and Energy Absorption of Hollow Truss Structures

Mechanical Characteristics of Architected Polycrystal Lattice Affected by the Orientation of Metagrain Boundary

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