An investigation of the mechanical properties of metallic lattice structures fabricated using selective laser melting

Feng, Qiang; Tang, Qian; Liu, Zongmin; Liu, Ying; Setchi, Rossi

doi:10.1177/0954405416668924

Cited by 45 publications

(27 citation statements)

References 22 publications

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“…It combined the characteristics of the cube and BCC/OC (Limmahakhun et al, 2017b;Wang L. et al, 2017). Adding vertical stiffeners through the center of the BCC/OC unit was also a way to improve the original BCC/OC (shown in Figure 1a 2 ) (Feng et al, 2016). All these reinforced BCC/OC scaffolds were better than the original BCC structures in compressive properties and Young's modulus.…”

Section: The Bcc/ocmentioning

confidence: 99%

“…The combination of FCC and BCC, named face and body-centered cube cell (FBCC)/with vertical struts (FBCCz), was another way of improvement. The mechanical properties were measured in the compression test, and the results indicated that FBCC/FBCCZ designed scaffold has higher stiffness than the original BCC/OC (Feng et al, 2016). Furthermore, the FBCCz designed scaffold showed the highest specific modulus, which meant that the structure provided superior performance for compressive load scenarios that attempt to optimize the stiffness-to-weight ratio (Mazur et al, 2015).…”

Section: The Bcc/ocmentioning

confidence: 99%

See 1 more Smart Citation

Porous Scaffold Design for Additive Manufacturing in Orthopedics: A Review

Chen

Han

Wang

et al. 2020

Front. Bioeng. Biotechnol.

154

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With the increasing application of orthopedic scaffolds, a dramatically increasing number of requirements for scaffolds are precise. The porous structure has been a fundamental design in the bone tissue engineering or orthopedic clinics because of its low Young's modulus, high compressive strength, and abundant cell accommodation space. The porous structure manufactured by additive manufacturing (AM) technology has controllable pore size, pore shape, and porosity. The single unit can be designed and arrayed with AM, which brings controllable pore characteristics and mechanical properties. This paper presents the current status of porous designs in AM technology. The porous structures are stated from the cellular structure and the whole structure. In the aspect of the cellular structure, non-parametric design and parametric design are discussed here according to whether the algorithm generates the structure or not. The non-parametric design comprises the diamond, the body-centered cubic, and the polyhedral structure, etc. The Voronoi, the Triply Periodic Minimal Surface, and other parametric designs are mainly discussed in parametric design. In the discussion of cellular structures, we emphasize the design, and the resulting biomechanical and biological effects caused by designs. In the aspect of the whole structure, the recent experimental researches are reviewed on uniform design, layered gradient design, and layered gradient design based on topological optimization, etc. These parts are summarized because of the development of technology and the demand for mechanics or bone growth. Finally, the challenges faced by the porous designs and prospects of porous structure in orthopedics are proposed in this paper.

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Section: The Bcc/ocmentioning

confidence: 99%

Section: The Bcc/ocmentioning

confidence: 99%

Porous Scaffold Design for Additive Manufacturing in Orthopedics: A Review

Chen

Han

Wang

et al. 2020

Front. Bioeng. Biotechnol.

154

View full text Add to dashboard Cite

show abstract

“…Knowing the mechanical properties of strut, finite element analysis could be develop to simulate the behavior of 316L scaffolds. In this way, the engineering stress-strain diagrams can be correlated with theoretical predictions of 316L scaffolds [49]. Future studies are required to evaluate the strut accuracy and imperfections by X-ray microtomography (micro-CT scanning) [50].…”

Section: Validating the Knowledgementioning

confidence: 99%

Improving the Mechanical Strength of Dental Applications and Lattice Structures SLM Processed

Cosma

Kessler²,

Gebhardt

et al. 2020

Materials

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To manufacture custom medical parts or scaffolds with reduced defects and high mechanical characteristics, new research on optimizing the selective laser melting (SLM) parameters are needed. In this work, a biocompatible powder, 316L stainless steel, is characterized to understand the particle size, distribution, shape and flowability. Examination revealed that the 316L particles are smooth, nearly spherical, their mean diameter is 39.09 μm and just 10% of them hold a diameter less than 21.18 μm. SLM parameters under consideration include laser power up to 200 W, 250–1500 mm/s scanning speed, 80 μm hatch spacing, 35 μm layer thickness and a preheated platform. The effect of these on processability is evaluated. More than 100 samples are SLM-manufactured with different process parameters. The tensile results show that is possible to raise the ultimate tensile strength up to 840 MPa, adapting the SLM parameters for a stable processability, avoiding the technological defects caused by residual stress. Correlating with other recent studies on SLM technology, the tensile strength is 20% improved. To validate the SLM parameters and conditions established, complex bioengineering applications such as dental bridges and macro-porous grafts are SLM-processed, demonstrating the potential to manufacture medical products with increased mechanical resistance made of 316L.

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“…From a material point of view, previous SLM research has predominantly focused on lattice specimens made of Ti6Al4V [ 25 , 26 , 27 , 28 , 29 ], CoCr [ 30 , 31 ], and stainless-steel alloy [ 10 , 32 , 33 , 34 ]. Thanks to the modified chemical composition, Ti6Al7Nb alloy is characterized by higher corrosion resistance and bio-tolerance in comparison with Ti6Al4V [ 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Physical–Mechanical Characteristics and Microstructure of Ti6Al7Nb Lattice Structures Manufactured by Selective Laser Melting

et al. 2020

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The demand of lattice structures for medical applications is increasing due to their ability to accelerate the osseointegration process, to reduce the implant weight and the stiffness. Selective laser melting (SLM) process offers the possibility to manufacture directly complex lattice applications, but there are a few studies that have focused on biocompatible Ti6Al7Nb alloy. The purpose of this work was to investigate the physical–mechanical properties and the microstructure of three dissimilar lattice structures that were SLM-manufactured by using Ti6Al7Nb powder. In particular, the strut morphology, the fracture characterization, the metallographic structure, and the X-ray phase identification were analyzed. Additionally, the Gibson-Ashby prediction model was adapted for each lattice topology, indicating the theoretical compressive strength and Young modulus. The resulted porosity of these lattice structures was approximately 56%, and the pore size ranged from 0.40 to 0.91 mm. Under quasi-static compression test, three failure modes were recorded. Compared to fully solid specimens, the actual lattice structures reduce the elastic modulus from 104 to 6–28 GPa. The struts surfaces were covered by a large amount of partial melted grains. Some solidification defects were recorded in struts structure. The fractographs revealed a brittle rupture of struts, and their microstructure was mainly α’ martensite with columnar grains. The results demonstrate the suitability of manufacturing lattice structures made of Ti6Al7Nb powder having unique physical–mechanical properties which could meet the medical requirements.

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An investigation of the mechanical properties of metallic lattice structures fabricated using selective laser melting

Abstract: An investigation of the mechanical properties of metallic lattice structures fabricated using selective laser melting.

Cited by 45 publications

References 22 publications

Porous Scaffold Design for Additive Manufacturing in Orthopedics: A Review

Porous Scaffold Design for Additive Manufacturing in Orthopedics: A Review

Improving the Mechanical Strength of Dental Applications and Lattice Structures SLM Processed

Physical–Mechanical Characteristics and Microstructure of Ti6Al7Nb Lattice Structures Manufactured by Selective Laser Melting

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