Bending behavior of octet-truss lattice structures: Modelling options, numerical characterization and experimental validation

Korshunova, Nina; Alaimo, Gianluca; Hosseini, Seyyed Bahram; Carraturo, Massimo; Reali, Alessandro; Niiranen, Jarkko; Auricchio, Ferdinando; Rank, Ernst; Kollmannsberger, Stefan

doi:10.1016/j.matdes.2021.109693

Cited by 62 publications

(25 citation statements)

References 42 publications

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“…In addition, porous structures could regulate stress shielding to reduce bone resorption accordingly to match the stiffness of the local host bone. Some studies reported that the octet-truss structure is a good choice because of appropriate strength and bone ingrowth at high porosity (70% designed) (Feng et al, 2021;Korshunova et al, 2021). In addition, implants with different amounts of roughness have been proven to affect the ability of osseointegration via multiple factors, including enhancing the differentiation of osteoblasts, reducing the activity of osteoclasts, and promoting bone attachment to the implant surface and its mineralization.…”

Section: Discussionmentioning

confidence: 99%

Novel Design of the Compound Sleeve and Stem Prosthesis for Treatment of Proximal Femur Bone Defects Based on Topology Optimization

Xue

Bai

Zhou

et al. 2022

Front. Bioeng. Biotechnol.

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The loosening of traditional prosthetics is among the leading causes of surgical failure of proximal femoral bone defects. A novel compound sleeve and stem prosthesis was designed using an optimization methodology that combined an octet-truss porous structure with density-based topology optimization to improve stability, promote bone ingrowth, and enhance biomechanical properties. Biomechanical changes were assessed using finite element analysis. The distribution of stress, the strain energy density, and the relative micromotion in the optimized group were considered. The optimized sleeve prosthesis achieved a 31.5% weight reduction. The maximum stresses in the optimized group were observed to decrease by 30.33 and 4.74% at the back sleeve and neck part of stem prosthesis, with a 29.52% increase in the femur, respectively. The average stress in most selected regions in the optimized group was significantly greater than that in the original group (p < 0.05). The maximum relative micromotion decreased by 15.18% (from 63.9 to 54.2 μm) in the optimized group. The novel designed compound sleeve and stem prosthesis could effectively improve the biomechanical performance of next-generation prosthetics and provide a microenvironment for bone ingrowth. The presented method could serve as a model for clinical practice and a platform for future orthopedic surgery applications.

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Section: Discussionmentioning

confidence: 99%

Novel Design of the Compound Sleeve and Stem Prosthesis for Treatment of Proximal Femur Bone Defects Based on Topology Optimization

Xue

Bai

Zhou

et al. 2022

Front. Bioeng. Biotechnol.

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show abstract

“…[6][7][8][9] Introducing all defects in the finite element model can improve the accuracy of the analysis results obviously. [10][11][12][13][14] On the other hand, as mentioned in the research, 15 in the lattice materials manufactured by additive manufacturing, there are obvious differences in the micro structures of different parts, which will make the structural response have obvious nonlinear effects. However, the considerations of defects or nonlinear effect are complex and difficult.…”

Section: Introductionmentioning

confidence: 98%

Multiscale analysis for 3D lattice structures based on parallel computing

Yan

Huo

et al. 2021

Numerical Meth Engineering

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In this study, a parallel framework for the multiscale analysis of three‐dimensional lattice structures is developed. The established parallel framework performs the multiscale analysis using the extended multiscale finite element method (EMsFEM) in a parallel environment provided by the portable and extensible toolkit for scientific computation (PETSc), which is a high‐performance parallel scientific computing library. To realize this aim, we developed several modifications of the original EMsFEM method and adopted some routines from PETSc. Through numerical examples, the efficiency and accuracy of the proposed parallel computing framework were verified first. Then, the parallel acceleration ratio and parallel efficiency of the proposed parallel framework were studied. The proposed parallel computing framework shows good efficiency and can be used to deal with the analysis of large‐scale lattice structures.

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“…Rashid et al [29] studied the flexural properties of the as-built SLMed AlSi12 uniform density lattice beams comprising circular, triangular, and hexagonal unit cells. Korshunova et al [30] developed a CT-based numerical framework for the evaluation of the flexural behavior of the as-built SLMed 316L steel octet-truss lattice structures under 3-point bending loading. Recently, Tao et al [31] investigated the flexural performance of the FDM-processed PLA lattice structure based on cubic diamond and cubic fluorite unit cells filled with polyurethane foam.…”

Section: Introductionmentioning

confidence: 99%

LPBF Manufactured Functionally Graded Lattice Structures Obtained by Graded Density and Hybrid Poisson’s Ratio

et al. 2022

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The additive manufacturing (AM) of innovative lattice structures with unique mechanical properties has received widespread attention due to the capability of AM processes to fabricate freeform and intricate structures. The most common way to characterize the additively manufactured lattice structures is via the uniaxial compression test. However, although there are many applications for which lattice structures are designed for bending (e.g., sandwich panels cores and some medical implants), limited attention has been paid toward investigating the flexural behavior of metallic AM lattice structures with tunable internal architectures. The purpose of this study was to experimentally investigate the flexural behavior of AM Ti-6Al-4V lattice structures with graded density and hybrid Poisson’s ratio (PR). Four configurations of lattice structure beams with positive, negative, hybrid PR, and a novel hybrid PR with graded density were manufactured via the laser powder bed fusion (LPBF) AM process and tested under four-point bending. The manufacturability, microstructure, micro-hardness, and flexural properties of the lattices were evaluated. During the bending tests, different failure mechanisms were observed, which were highly dependent on the type of lattice geometry. The best response in terms of absorbed energy was obtained for the functionally graded hybrid PR (FGHPR) structure. Both the FGHPR and hybrid PR (HPR) structured showed a 78.7% and 62.9% increase in the absorbed energy, respectively, compared to the positive PR (PPR) structure. This highlights the great potential for FGHPR lattices to be used in protective devices, load-bearing medical implants, and energy-absorbing applications.

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Bending behavior of octet-truss lattice structures: Modelling options, numerical characterization and experimental validation

Cited by 62 publications

References 42 publications

Novel Design of the Compound Sleeve and Stem Prosthesis for Treatment of Proximal Femur Bone Defects Based on Topology Optimization

Novel Design of the Compound Sleeve and Stem Prosthesis for Treatment of Proximal Femur Bone Defects Based on Topology Optimization

Multiscale analysis for 3D lattice structures based on parallel computing

LPBF Manufactured Functionally Graded Lattice Structures Obtained by Graded Density and Hybrid Poisson’s Ratio

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