Fatigue behavior of Ti–6Al–4V foams processed by magnesium space holder technique

Aşık, Emin Erkan; Bor, Şakir

doi:10.1016/j.msea.2014.10.068

Cited by 51 publications

(9 citation statements)

References 40 publications

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“…Among these powder metallurgy techniques, the 'space holder technique' has attracted significant attention since it offers the ability to control pore size, shape and distribution [8]. Magnesium [9], Carbamide [10,11 ], NaCl [12,13] and Acrowax [14] have all been used as space holders in the literature. However, a major drawback to the more general adoption of these materials is that c urrent methods of Ti cellular structure manufacture present significant limitations, such as multiple process steps and the production of geometries which are limited by the mould tooling complexity.…”

Section: Introductionmentioning

confidence: 99%

Salt-metal feedstocks for the creation of stochastic cellular structures with controlled relative density by powder bed fabrication

et al. 2018

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A novel type of metallic feedstock material for powder-bed additive manufacturing (AM) processes is proposed that enables the manufacture of cellular structures without the time consuming and computationally intensive step of digitally representing the internal geometry of a part. The feedstock is a blend of metal and salt particles and, following Selective Laser Melting (SLM) processing, the salt is dissolved to leave a metallic, cellular structure. The conditions for succesfully processing the feedstock are first demonstrated, followed by an investigation into how the feedstock composition can be used to control the relative density of the cellular material. Mechanical testing reveals that the strength and stiffness of the cellular structures can be tuned through control of feedstock composition, and hence, relative density. This presents a significant enhancement to the state-of-the-art for materials preparation for AM since, for the first time, cellular structures can be created with specific properties without explicitly defining or analysing the unit cell geometry.

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Section: Introductionmentioning

confidence: 99%

Salt-metal feedstocks for the creation of stochastic cellular structures with controlled relative density by powder bed fabrication

et al. 2018

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“…Now, the constant k values of equations (2) and (3) can be used to evaluate the produced OPNZ scaffold deformation mechanism during compression testing (Aşik and Bor, 2015; Kadkhodapour et al , 2017). Previous studies analyzed the deformation process under compression and found the values of k as 1, 2 and 3 for yielding, bending and buckling of unit cell struts, respectively (Hakamada et al , 2007).…”

Section: Comparison With the Gibson–ashby Modelmentioning

confidence: 99%

Mapping the structural properties of zinc scaffold fabricated via rapid tooling for bone tissue engineering applications

Kansal

Dvivedi

Kumar

2023

RPJ

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Purpose The purpose of this study to investigate the organized porous network zinc (OPNZ) scaffolds. Their mechanical characteristics, surface roughness and fracture mechanism were assessed in relation to their structural properties. The prospects of fused deposition modeling (FDM) for printing metal scaffolds via rapid tooling have also been studied. Design/methodology/approach Zn scaffolds with different pore and strut sizes were manufactured via the rapid tooling method. This method is a multistep process that begins with the 3D printing of a polymer template. Later, a paraffin template was obtained from the prepared polymer template. Finally, this paraffin template was used to fabricate the Zn scaffold using microwave sintering. The characterization of prepared Zn samples involved structural characterization, microstructural study, surface roughness testing and compression testing. Moreover, based on the Gibson–Ashby model analysis, the model equations’ constant values were evaluated, which can help in predicting the mechanical properties of Zn scaffolds. Findings The scanning electron microscopy study confirmed that the fabricated sample pores were open and interconnected. The X-ray diffraction analysis revealed that the Zn scaffold contained hexagonal closed-packed Zn peaks related to the a-Zn phase, validating that scaffolds were free from contamination and impurity. The range for ultimate compressive strength, compressive modulus and plateau stresses for Zn samples were found to be 6.75–39 MPa, 0.14–3.51 GPa and 1.85–12.6 MPa by adjusting their porosity, which are comparable with the cancellous bones. The average roughness value for the Zn scaffolds was found to be 1.86 µm. Originality/value This research work can widen the scope for extrusion-based FDM printers for fabricating biocompatible and biodegradable metal Zn scaffolds. This study also revealed the effects of scaffold structural properties like porosity, pore and strut size effect on their mechanical characteristics in view of tissue engineering applications.

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“…Therefore, porous titanium alloys have also been studied extensively for biomedical applications, e.g. bone implants [14] to [16]. Porous titanium implants, in addition to preserving the excellent biocompatible mechanical properties of titanium, have very low stiffness values, which are comparable to those of natural bones [17].…”

Section: Pre Designed Regular Cell Structuresmentioning

confidence: 99%

Fatigue of Cellular Structures – a Review

Nečemer¹,

Vesenjak²,

Glodež³

2019

SV-JME

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A review of the fatigue and fracture behaviour of cellular structures with consideration of their fabrication and characterization is presented in this paper. The review is focused on some typical and often used cellular structures, which are divided into three main groups: (1) pre designed regular cellular structures, (2) irregular cellular structures, (3) composites with cellular cores. For each group, the current manufacturing technique is presented for producing the particular cellular structure belonging this group. Furthermore, the state-of-the-art of the fatigue behaviour is explained for the analysed cellular structures. Based on the findings in this review, it can be concluded that cellular structures show a huge potential to become important lightweight structural materials of the future with further development of additive manufacturing technologies, or with introduction of some new, more cost effective manufacturing techniques. However, the knowledge of the fatigue behaviour of these structures is poor, and should be the subject of the further investigations.

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Fatigue behavior of Ti–6Al–4V foams processed by magnesium space holder technique

Cited by 51 publications

References 40 publications

Salt-metal feedstocks for the creation of stochastic cellular structures with controlled relative density by powder bed fabrication

Salt-metal feedstocks for the creation of stochastic cellular structures with controlled relative density by powder bed fabrication

Mapping the structural properties of zinc scaffold fabricated via rapid tooling for bone tissue engineering applications

Fatigue of Cellular Structures – a Review

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