Compression–compression fatigue behaviour of gyroid-type triply periodic minimal surface porous structures fabricated by selective laser melting

Yang, Lei; Yan, Chunze; Cao, Wenchao; Liu, Zhufeng; Song, Bo; Wen, Shifeng; Zhang, Cong; Shi, Yusheng; Yang, Shoufeng

doi:10.1016/j.actamat.2019.09.042

Cited by 225 publications

(60 citation statements)

References 81 publications

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“…The Hexa lattice specimens exhibit no stress drops caused by the shear band formation ( Figure 5 and Figure 7 ). It is reported that the shear band formation in the BCC lattice structure induced bending deformation of struts, resulting in crack initiations on tensile stress parts [ 16 , 30 ]. In fact, the cracks were observed in X-ray CT images of the BCC and TO lattice specimens ( Figure 8 and Figure 9 ).…”

Section: Discussionmentioning

confidence: 99%

Compressive Properties of Al-Si Alloy Lattice Structures with Three Different Unit Cells Fabricated via Laser Powder Bed Fusion

et al. 2020

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In the present study, in order to elucidate geometrical features dominating deformation behaviors and their associated compressive properties of lattice structures, AlSi10Mg lattice structures with three different unit cells were fabricated by laser powder bed fusion. Compressive properties were examined by compression and indentation tests, micro X-ray computed tomography (CT), together with finite element analysis. The truncated octahedron- unit cell (TO) lattice structures exhibited highest stiffness and plateau stress among the studied lattice structures. The body centered cubic-unit cell (BCC) and TO lattice structures experienced the formation of shear bands with stress drops, while the hexagon-unit cell (Hexa) lattice structure behaved in a continuous deformation and flat plateau region. The Hexa lattice structure densified at a smaller strain than the BCC and TO lattice structures, due to high density of the struts in the compressive direction. Static and high-speed indentation tests revealed that the TO and Hexa exhibited slight strain rate dependence of the compressive strength, whereas the BCC lattice structure showed a large strain rate dependence. Among the lattice structures in the present study, the TO lattice exhibited the highest energy absorption capacity comparable to previously reported titanium alloy lattice structures.

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Section: Discussionmentioning

confidence: 99%

Compressive Properties of Al-Si Alloy Lattice Structures with Three Different Unit Cells Fabricated via Laser Powder Bed Fusion

et al. 2020

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“…The results showed that the stress concentration point of the P surface was the thin neck regions between the cell regions (Maskery et al, 2018b). The failure mechanism of the bending structure showed that the scaffold presented a 45 • shear band under ultimate pressure (Afshar et al, 2016;Montazerian et al, 2017Montazerian et al, , 2019Yang et al, 2019b). The reason for this result might be related to the uniform stress distribution on the D surface (Maskery et al, 2018a).…”

Section: Tpmsmentioning

confidence: 98%

Porous Scaffold Design for Additive Manufacturing in Orthopedics: A Review

Chen

Han

Wang

et al. 2020

Front. Bioeng. Biotechnol.

141

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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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“…[ 34 ] Yang et al showed that the smoothed surface of the TPMS structure by sandblasting treatment can improve the fatigue performance compared with the as‐built counterpart. [ 35 ] The previous studies mostly concern with mechanical properties of TPMS structures with very low relative densities typically lower than 0.2, whereas those with the medium relative densities of 0.2–0.4 have not been reported. Furthermore, the macroscopic examination of the topological geometry change during the compressive deformation has yet been done, and its relation to the energy absorption performance is not well understood.…”

Section: Introductionmentioning

confidence: 99%

Energy Absorption and Deformation Behavior of 3D Printed Triply Periodic Minimal Surface Stainless Steel Cellular Structures under Compression

Liang

Zhou

Liu

et al. 2020

steel research int.

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This article investigates the energy absorption performance and deformation mechanism of 316L stainless steel (SS316L) triply periodic minimal surface (TPMS) cellular structures fabricated by a selective laser melting (SLM) technique. The as‐built specimens are subjected to abrasive blasting treatment to improve the surface quality of the printed parts, in order to reveal the true surface and mechanical characteristics of the TPMS structures. It is found that the P‐type structure outperforms the G‐type structure with a higher energy absorption capability at low relative densities (<0.35). The macroscopic examination of these micro‐architectures reveals that the P‐type structure develops a rapid local cell deformation following the diagonal shear geometry on the face sheet, whereas the G‐type structure experiences continuous strain hardening along the stress plateau and deforms in a gradual manner during compression. The apparent strain hardening effect of the G‐type structure is caused by the development of many macro‐localities with extreme geometry distortion and cell wall self‐contacting during compression. The findings in this study may provide valuable insight into design, fabrication, and post‐fabrication treatment of metallic TPMS structures for the applications of high compression performance.

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Compression–compression fatigue behaviour of gyroid-type triply periodic minimal surface porous structures fabricated by selective laser melting

Cited by 225 publications

References 81 publications

Compressive Properties of Al-Si Alloy Lattice Structures with Three Different Unit Cells Fabricated via Laser Powder Bed Fusion

Compressive Properties of Al-Si Alloy Lattice Structures with Three Different Unit Cells Fabricated via Laser Powder Bed Fusion

Porous Scaffold Design for Additive Manufacturing in Orthopedics: A Review

Energy Absorption and Deformation Behavior of 3D Printed Triply Periodic Minimal Surface Stainless Steel Cellular Structures under Compression

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