An experimental and numerical investigation of compressive response of designed Schwarz Primitive triply periodic minimal surface with non-uniform shell thickness

Jia, Heran; Lei, Hongshuai; Wang, Panding; Ji, Meng; Li, Chuanlei; Zhou, Hao; Zhang, Xiaoyu; Fang, Daining

doi:10.1016/j.eml.2020.100671

Cited by 93 publications

(26 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…On the contrary, the TPMS-based scaffolds have a mean curvature of zero [18], a high surface-to-volume ratio [19], the ease of functional grading [20] and a variable /tunable electrical/thermal conductivity [21], which can make their properties anatomical location-specific and subjectspecific and consequently can largely increase their potentials in the applications in biomedicine and relevant fields [22]. In recent years, the functionally graded scaffold and other novel design strategy has been used to design scaffolds [23][24][25][26][27][28], because the bionic scaffolds, which have the mechanical and biological properties similar to those of the replaced natural tissues, can be achieved using these methods. However, when designing uniform or functionally graded scaffolds for a specific application, it is still unclear which scaffold topology is the best candidate among the vast TPMS scaffold topologies, e.g., Gyroid, Diamond, Schwarz P. This is because the relationship between the scaffold properties and the underlying topologies is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Relationship between the morphological, mechanical and permeability properties of porous bone scaffolds and the underlying microstructure

et al. 2020

View full text Add to dashboard Cite

Bone scaffolds are widely used as one of the main bone substitute materials. However, many bone scaffold microstructure topologies exist and it is still unclear which topology to use when designing scaffold for a specific application. The aim of the present study was to reveal the mechanism of the microstructure-driven performance of bone scaffold and thus to provide guideline on scaffold design. Finite element (FE) models of five TPMS (Diamond, Gyroid, Schwarz P, Fischer-Koch S and F-RD) and three traditional (Cube, FD-Cube and Octa) scaffolds were generated. The effective compressive and shear moduli of scaffolds were calculated from the mechanical analysis using the FE unit cell models with the periodic boundary condition. The scaffold permeability was calculated from the computational fluid dynamics (CFD) analysis using the 4×4×4 FE models. It is revealed that the surface-to-volume ratio of the Fischer-Koch S-based scaffold is the highest among the scaffolds investigated. The mechanical analysis revealed that the bending deformation dominated structures (e.g., the Diamond, the Gyroid, the Schwarz P) have higher effective shear moduli. The stretching deformation dominated structures (e.g., the Schwarz P, the Cube) have higher effective compressive moduli. For all the scaffolds, when the same amount of change in scaffold porosity is made, the corresponding change in the scaffold relative shear modulus is larger than that in the relative compressive modulus. The CFD analysis revealed that the structures with the simple and straight pores (e.g., Cube) have higher permeability than the structures with the complex pores (e.g., Fischer-Koch S). The main contribution of the present study is that the relationship between scaffold properties and the underlying microstructure is systematically investigated and thus some guidelines on the design of bone scaffolds are provided, for example, in the scenario where a high surface-to-volume ratio is required, it is suggested to use the Fischer-Koch S based scaffold.

show abstract

Section: Introductionmentioning

confidence: 99%

Relationship between the morphological, mechanical and permeability properties of porous bone scaffolds and the underlying microstructure

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Cellular scaffolds designed by conventional manufacturing methods (Yang et al, 2001) have a single type of pore unit, and most of them can only make coarse adjustments to individual parameters such as porosity and pore size (Jia et al, 2020;Jiang et al, 2020). The internal microscopic honeycomb structure of the forming scaffold is random, and the pores are not completely connected, which cannot meet the actual needs.…”

Section: Cellular Scaffoldsmentioning

confidence: 99%

Research progress of 3D printing combined with thermoplastic foaming

Sun

2022

Front. Mater.

View full text Add to dashboard Cite

Thermoplastic foam additive manufacturing is a brand-new industry that perfectly combines the advantages of polymer foaming with AM. The 3D printing industry currently suffers from limited available materials and monolithic part manufacturing, and 3D printed foam offers a new way of thinking to address these challenges. Designing multifunctional components with additive manufacturing gives designers great flexibility, while foaming reduces the weight of materials and costs. The combination of the two allows for the creation of lightweight structural and functional items with differentiated physical properties. This one-of-a-kind and innovative approach can be achieved in the printed section. 3D printing foam, on the other hand, is still in its infancy. This review examines the respective functions and applications of additive manufacturing and foaming, and then attempts to summarize four commonly used 3D printing methods at this stage:1) cellular scaffolds; 2) composite printing foam; 3) post-foaming of printed solid scaffolds; 4) in-situ foam 3D printing. Among these methods, in-situ foam 3D printing is the technique that properly merges the foaming and fused filament fabrication processes. Although in the early stages of research and not yet fully established, this foam 3D printing technique seems to be the trend to replace other foaming processes.

show abstract

“…In recent years, the research on the optimization of the unit cell of TPMS to improve their performance drew great interest. Jia et al [ 31 ] proposed an enhanced design method based on local shell thickening of the unit cell of TPMS. Liu et al [ 32 ] proposed a novel design method for a composite porous structure based on TPMS and geodesic B-spline hollowing.…”

Section: Introductionmentioning

confidence: 99%

Additively Manufactured Scaffolds with Optimized Thickness Based on Triply Periodic Minimal Surface

Zhu

Zou

et al. 2022

Materials

View full text Add to dashboard Cite

Triply periodic minimal surfaces (TPMS) became an effective method to design porous scaffolds in recent years due to their superior mechanical and other engineering properties. Since the advent of additive manufacturing (AM), different TPMS-based scaffolds are designed and fabricated for a wide range of applications. In this study, Schwarz Primitive triply periodic minimal surface (P-TPMS) is adopted to design a novel porous scaffold according to the distribution of the scaffold stress under a fixed load with optimized thickness to tune both the mechanical and biological properties. The designed scaffolds are then additively manufactured through selective laser melting (SLM). The micro-features of the scaffolds are studied through scanning electron microscopy (SEM) and micro-computed tomography (CT) images, and the results confirm that morphological features of printed samples are identical to the designed ones. Afterwards, the quasi-static uniaxial compression tests are carried out to observe the stress–strain curves and the deformation behavior. The results indicate that the mechanical properties of the porous scaffolds with optimized thickness were significantly improved. Since the mass transport capability is important for the transport of nutrients within the bone scaffolds, computational fluid dynamics (CFD) are used to calculate the permeability under laminar flow conditions. The results reveal that the scaffolds with optimized structures possess lower permeability due to the rougher inner surface. In summary, the proposed method is effective to tailor both the mechanical properties and permeability, and thus offers a means for the selection and design of porous scaffolds in biomedical fields.

show abstract

An experimental and numerical investigation of compressive response of designed Schwarz Primitive triply periodic minimal surface with non-uniform shell thickness

Cited by 93 publications

References 37 publications

Relationship between the morphological, mechanical and permeability properties of porous bone scaffolds and the underlying microstructure

Relationship between the morphological, mechanical and permeability properties of porous bone scaffolds and the underlying microstructure

Research progress of 3D printing combined with thermoplastic foaming

Additively Manufactured Scaffolds with Optimized Thickness Based on Triply Periodic Minimal Surface

Contact Info

Product

Resources

About