Effects of porosity gradient pattern on mechanical performance of additive manufactured Ti-6Al-4V functionally graded porous structure

Xiong, Yinze; Han, Zhengzhe; Qin, Jiawei; Dong, Lanlan; Zhang, Hang; Wang, Yanan; Chen, Huajiang; Li, Xiang

doi:10.1016/j.matdes.2021.109911

Cited by 40 publications

(12 citation statements)

References 47 publications

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“…In terms of optimizing the shape of the porous bone scaffolds, the optimization of conventional structures has gradually become a new research hotspot for many scholars, which provides a new reference for structural aspects of implantable bone scaffolds. Ali [ 29 ] improved the structure of Face Centered Cubic (FCC) structures and found that the scaffold became stiffer under small strains; moreover, Xiong [ 30 ] improved the functional-gradient porous structure and found that the mechanical properties of the optimized structure were significantly improved. The present study, which is at the forefront of international research to optimize the BCC structure, shows a significant reduction in stress concentration and a more desirable yield strength, which provides a new reference for structural improvements in bone implant scaffolds.…”

Section: Resultsmentioning

confidence: 99%

Optimization of Structural and Processing Parameters for Selective Laser Melting of Porous 316L Bone Scaffolds

Zhang

Ren

et al. 2022

Materials

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In the implantation of porous bone scaffolds, good mechanical properties of the scaffold are a prerequisite for the long-term functionality of the implanted scaffolds, which varies according to the structure and the forming process. In this study, the influence of the forming parameters and structure of the Selective Laser Melting (SLM) process on the mechanical properties of 316L stainless steel bone scaffolds was investigated using finite element simulation combined with experimental methods. The mechanism of the influence of the process parameters and structure on the mechanical properties of bone scaffolds was summarized using static compression finite element numerical simulations, compression experiments, hydrodynamic simulations, forming numerical simulations and SLM forming experiments. The results show that the magnitude of residual stress and the distribution of defects under different process parameters had a strong influence on the microstructure and properties of the scaffold, and the residual stress of the Body-Centered Cube (BCC) structure formed at an energy density of 41.7 J/mm3 was significantly reduced, with less surface spheroidization and fewer cracks on the melt pool surface. The smallest grain size of 321 nm was obtained at an energy density of 77.4 J/mm3, while in terms of mechanical properties, the optimization of the structure resulted in an 8.3% increase in yield strength and a reduction in stress concentration. The predictions of stress, deformation, and forming quality during construction with different process parameters, achieved using finite element analysis, are basically in agreement with the experimental results, indicating that the best process parameters for forming BCC structural supports were determined by using finite element simulation combined with experiments; moreover, the distribution and evolution of residual stresses and defects under different process parameters for constructing BCC structures were obtained.

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Section: Resultsmentioning

confidence: 99%

Optimization of Structural and Processing Parameters for Selective Laser Melting of Porous 316L Bone Scaffolds

Zhang

Ren

et al. 2022

Materials

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“…In addition, a TPMS-based sigmoid function enabled smooth transition of properties in a FG porous material 156 . Researchers have also developed a semi-empirical formula that can be used to predict the mechanical behavior of TPMS based laser-manufacturing systems for scaffold applications 157 . New studies in the domain of FGAM and orthopedic involve topological optimization of the lattices and methods of FGM 158159160 .…”

Section: Functionally Graded Orthopedic Implants With Additive Manufa...mentioning

confidence: 99%

Functionally graded additive manufacturing for orthopedic applications

Rouf

Malik

Raina

et al. 2022

Journal of Orthopaedics

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“…for CS (9) w(0)= φ(0)= 0 , w(L)= φ(L)= 0 for CC (10) w(0)= φ(0)= 0 for CF (11) More clearly, the finite element system of equations can be reached as below Input data: material and geometrical properties, Calculating constitutive matrix, Loop over elements: calculating element stiffness matrix K el and element force vector F el , Assembling all parts in the global coordinate system to have…”

Section: Two Nodes I and J Of A Beam Elementmentioning

confidence: 99%

“…Due to the high applicability of FG material, many studies related to various theories have been given to comment the mechanical behavior of FG structures as [4][5][6][7][8][9]. However, porosity of the material can occur during the manufacturing process [10][11][12]. So, for a good knowledge of porosity effect on bending behavior of FG structures, a study related to this issue must be considered as soon as possible.…”

Section: Introductionmentioning

confidence: 99%

Three Kinds օf Porosity օn Functionally Graded Porous Beams

Ton¹

2022

jaer

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In this paper, the effects of three types of porosity on bending behavior of functionally graded porous (FGP) beams are studied. The finite element procedure is established and based on the simple Timoshenko beam theory. The results achieved in this paper are presented and compared with other results in the references to verify the feasibility of implementing the formula and writing the Matlab code. On the other hand, this paper can help researchers to have an overview of the bending behavior of the functionally graded porous beams.

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Effects of porosity gradient pattern on mechanical performance of additive manufactured Ti-6Al-4V functionally graded porous structure

Cited by 40 publications

References 47 publications

Optimization of Structural and Processing Parameters for Selective Laser Melting of Porous 316L Bone Scaffolds

Optimization of Structural and Processing Parameters for Selective Laser Melting of Porous 316L Bone Scaffolds

Functionally graded additive manufacturing for orthopedic applications

Three Kinds օf Porosity օn Functionally Graded Porous Beams

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