Design, mechanical properties and energy absorption capability of graded-thickness triply periodic minimal surface structures fabricated by selective laser melting

2021 ◽  
pp. 106586
Author(s):  
Xiaojie Fan ◽  
Qian Tang ◽  
Qixiang Feng ◽  
Shuai Ma ◽  
Jun Song ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Minimal Surface ◽  
Energy Absorption ◽  
Selective Laser Melting ◽  
Surface Structures ◽  
Laser Melting ◽  
Periodic Minimal Surface ◽  
Triply Periodic ◽  
Triply Periodic Minimal Surface ◽  
Graded Thickness

scholarly journals Functionally Graded Scaffolds with Programmable Pore Size Distribution Based on Triply Periodic Minimal Surface Fabricated by Selective Laser Melting

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5046
Author(s):  
Xueyong Zhou ◽  
Yuan Jin ◽  
Jianke Du
Keyword(s):  
Mechanical Properties ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Minimal Surface ◽  
Size Distribution ◽  
Functionally Graded ◽  
Laser Melting ◽  
Periodic Minimal Surface ◽  
Triply Periodic ◽  
Triply Periodic Minimal Surface

Functional graded materials are gaining increasing attention in tissue engineering (TE) due to their superior mechanical properties and high biocompatibility. Triply periodic minimal surface (TPMS) has the capability to produce smooth surfaces and interconnectivity, which are very essential for bone scaffolds. To further enhance the versatility of TPMS, a parametric design method for functionally graded scaffold (FGS) with programmable pore size distribution is proposed in this study. Combining the relative density and unit cell size, the effect of design parameters on the pore size was also considered to effectively govern the distribution of pores in generating FGS. We made use of Gyroid to generate different types of FGS, which were then fabricated using selective laser melting (SLM), followed by investigation and comparison of their structural characteristics and mechanical properties. Their morphological features could be effectively controlled, indicating that TPMS was an effective way to achieve functional gradients which had bone-mimicking architectures. In terms of mechanical performance, the proposed FGS could achieve similar mechanical response under compression tests compared to the reference FGS with the same range of density gradient. The proposed method with control over pore size allows for effectively generating porous scaffolds with tailored properties which are potentially adopted in various fields.

Optimizing the pinch-off problem for gradient triply periodic minimal surface cellular structures manufactured by selective laser melting

2020 ◽  
Vol 26 (10) ◽  
pp. 1771-1781
Author(s):  
Mingkang Zhang ◽  
Yongqiang Yang ◽  
Wentao Qin ◽  
Shibiao Wu ◽  
Jie Chen ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Minimal Surface ◽  
Selective Laser Melting ◽  
Cellular Structures ◽  
Optimized Design ◽  
Laser Melting ◽  
Content Type ◽  
Periodic Minimal Surface ◽  
Triply Periodic ◽  
Triply Periodic Minimal Surface

Purpose This study aims to focus on the optimized design and mechanical properties of gradient triply periodic minimal surface cellular structures manufactured by selective laser melting. Design/methodology/approach Uniform and gradient IWP and primitive cellular structures have been designed by the optimized function in MATLAB, and selective laser melting technology was applied to manufacture these cellular structures. Finite element analysis was applied to optimize the pinch-off problem, and compressive tests were carried out for the evaluation of mechanical properties of gradient cellular structures. Findings Finite element analysis shows that the elastic modulus of IWP increased as design parameter b increased, and then decreased when parameter b is higher than 5.5. The highest elastic modulus of primitive increased by 89.2% when parameter b is 6. The compressive behavior of gradient IWP and primitive shows a layer-by-layer way, and elastic modulus and first maximum compressive strength of gradient primitive are higher than that of gradient IWP. The effective energy absorption of gradient cellular structures increased as the average porosity decreased, and the effective energy absorption of gradient primitive is about twice than that of gradient IWP. Originality/value This paper presents an optimized design method for the pinch-off problem of gradient triply periodic minimal surface cellular structures.

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