Finite element modeling of 3D-printed part with cellular internal structure using homogenized properties

Bhandari, Sunil; Lopez-Anido, Roberto

doi:10.1007/s40964-018-0070-2

Cited by 19 publications

(12 citation statements)

References 23 publications

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“…This anisotropy caused by the limited interlayer adhesion generally needs to be avoided through 1) optimization of the printing parameters, including the heating temperatures, preheating temperatures, [ 16 ] layer thicknesses, layer‐design, [ 17 ] and nozzle geometries; [ 18 ] 2) use of additives and solvent, [ 19 ] such as thermoplastic elastomers and low molecular additives; [ 19a,20 ] 3) facilitation of the formation of chemical bonds between adjacent layers; [ 21 ] 4) control of geometry structures; [ 14,22 ] and 5) postprocessing. [ 23 ]…”

Section: Fused Filament Fabricationmentioning

confidence: 99%

3D‐Printed Anisotropic Polymer Materials for Functional Applications

et al. 2021

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Anisotropy is the characteristic of a material to exhibit variations in its mechanical, electrical, thermal, optical properties, etc. along different directions. Anisotropic materials have attracted great research interest because of their wide applications in aerospace, sensing, soft robotics, and tissue engineering. 3D printing provides exceptional advantages in achieving controlled compositions and complex architecture, thereby enabling the manufacture of 3D objects with anisotropic functionalities. Here, a comprehensive review of the recent progress on 3D printing of anisotropic polymer materials based on different techniques including material extrusion, vat photopolymerization, powder bed fusion, and sheet lamination is presented. The state‐of‐the‐art strategies implemented in manipulating anisotropic structures are highlighted with the discussion of material categories, functionalities, and potential applications. This review is concluded with analyzing the current challenges and providing perspectives for further development in this field.

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Section: Fused Filament Fabricationmentioning

confidence: 99%

3D‐Printed Anisotropic Polymer Materials for Functional Applications

et al. 2021

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“…For instance, the authors in Vidakis et al (2017) characterized the compression behavior of FDM parts and developed a finite element method (FEM) model to determine the maximum admissible load, showing good agreement with experimental results. In a similar way, in Bhandari and Lopez-Anido (2019) a continuum finite element model of a three-dimensional-printed cellular structure is proposed, leading to accurate results for predicting the linearly elastic structural response of the parts.…”

Section: Parts Morphology and Behaviormentioning

confidence: 99%

Using simple estimates for the flexural stiffness of thick FDM beams based on sandwich beam models

Córdoba

Vallejo

Millán

et al. 2020

RPJ

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Purpose The incipient growth of the fused deposition modeling (FDM) techniques encourages the development of models to predict the behavior of these parts involving complicated and heterogeneous geometries whose behavior strongly diverges from the continuous model hypothesis. This paper aims to address the problem of predicting the flexural properties of FDM parts building on the geometrical similarity between a typical FDM part and a sandwich panel. Design/methodology/approach This paper takes advantage of the morphological similarity between FDM structures and composite sandwich panels. Thus, an approach based on classic sandwich theory is developed to validate its goodness to predict the flexural behavior of FDM parts. A set of tensile and flexural tests for FDM parts were conducted varying the density of the core pattern (10%, 15%, 20% and 25%), being the proposed model and the predicted results validated. Findings The results showed a good accordance between the predicted values of stiffness and the experimental data. Although this is especially evidenced for low infill density values, for densities above 20% the experimental values noticeably exceed the maximum predicted stiffness, which can be explained by the non-compliance of the foil honeycomb hypothesis for high-density patterns. The main implication of these findings lies in the possibility of using advanced models from thin-foil structures as a base to develop accurate analytical approaches to model FDM structures. Originality/value Although the experimental characterization of FDM parts has been a matter of study in the literature, the development of robust theoretical models that consider the influence of the particular morphology of these parts is still a challenge in this field. The approach proposed in this study constitutes the first step to develop a complete analytical model to predict the complex behavior of FDM printed parts.

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“…These infills have the advantage of simplicity, which makes them quick and reliable to print, but the infill geometry results in highly anisotropic structural properties. Bhandari and Lopez-Anido [10][11][12], have developed methods of homogenizing the behavior of sparse rectilinear infills into orthotropic effective properties, which could be very useful for designing components using this infill.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling and Experimental Investigation of Effective Elastic Properties of the 3D Printed Gyroid Infill

2022

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A numerical homogenization approach is presented for the effective elastic moduli of 3D printed cellular infills. A representative volume element of the infill geometry is discretized using either shell or solid elements and analyzed using the finite element method. The elastic moduli of the bulk cellular material are obtained through longitudinal and shear deformations of a representative volume element under periodic boundary conditions. The method is used to analyze the elastic behavior of gyroid infills for varying infill densities. The approach is validated by comparing the Young’s modulus and Poisson’s ratio with those obtained from compression experiments. Results indicate that although the gyroid infill exhibits cubic symmetry, it is nearly isotropic with a low anisotropy index. The numerical predictions are used to develop semi-empirical equations of the effective elastic moduli of gyroid infills as a function of infill density in order to inform design and topology optimization workflows.

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Finite element modeling of 3D-printed part with cellular internal structure using homogenized properties

Cited by 19 publications

References 23 publications

3D‐Printed Anisotropic Polymer Materials for Functional Applications

3D‐Printed Anisotropic Polymer Materials for Functional Applications

Using simple estimates for the flexural stiffness of thick FDM beams based on sandwich beam models

Numerical Modeling and Experimental Investigation of Effective Elastic Properties of the 3D Printed Gyroid Infill

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