Design, additive manufacturing, and characterisation of a three-dimensional cross-based fractal structure for shock absorption

Viccica, Marco; Galati, Manuela; Calignano, Flaviana; Iuliano, Luca

doi:10.1016/j.tws.2022.110106

Cited by 16 publications

(3 citation statements)

References 45 publications

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“…However, the following are some reports regarding the use and study of fractal structures for AM. In [10], the authors describe a cross-based fractal designed for shock absorption, showing convincing results (for shock absorbing helmet). At the micro level, fractal structures have also been proposed for the generation of porous structures [11].…”

Section: Introductionmentioning

confidence: 97%

Computational Model for Tree-like Fractals Used as Internal Structures for Additive Manufacturing Parts

Stanciu Birlescu,

Balc

2023

Applied Sciences

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It is well established that the introduction of additive manufacturing in various domains has produced significant technological leaps due to the advantages over other manufacturing techniques. Furthermore, additive manufacturing allows the design of parts with complex internal structures (e.g., lattice, honeycomb) to achieve lightweight or other mechanical properties. This paper presents a computational model (integrated into a programable algorithm) designed to generate complex internal structures, using tree-like fractals, for components (mechanical parts) whose designs are achievable by additive manufacturing. The computational model is presented in detail, starting from the mathematical definition and the properties of the proposed tree-like fractals. The fractal data are computed and arranged unequivocally using table representations. Based on the fractal data, the structures are generated inside CAD parts (which are given as inputs in the algorithm). The proposed computational method is applied in different case studies to illustrate their functionality. The generated CAD components (with fractal internal structures) are intended for manufacturing (using selective laser melting) and laboratory (mechanical) testing and for finite element analysis, which in turn can validate the use of tree-like fractals as interior structures for mechanical components.

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Section: Introductionmentioning

confidence: 97%

Computational Model for Tree-like Fractals Used as Internal Structures for Additive Manufacturing Parts

Stanciu Birlescu,

Balc

2023

Applied Sciences

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“…Stereolithography appearance (SLA) is one of the most widely used 3D printing techniques [ 16 ]. Marco Viccica et al used SLA technology to fabricate a 3D cross-base fractal structure for shock absorption, and studied the mechanical properties of a 3D Greek cross fractal [ 17 ]. They conducted numerical studies on the mechanical behavior of the structure under quasi-static and dynamic compression loads, established a material model, and verified the correctness of the model through experiments.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fractal Ceramic Structure on Mechanical Properties of Alumina Ceramic–Aluminum Composites

et al. 2023

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In conventional ceramic–metal matrix composites, with the addition of the ceramic phase, although it can significantly improve the performance of the material in one aspect, it tends to weaken some of the excellent properties of the metal matrix as well. In order to meet the high toughness and high strength requirements of composites for practical production applications, researchers have searched for possible reinforcing structures from nature. They found that fractal structures, which are widely found in nature, have the potential to improve the mechanical properties of materials. However, it is often not feasible to manufacture these geometric structures using conventional processes. In this study, alumina ceramic fractal structures were prepared by 3D printing technology, and aluminum composites containing fractal ceramic structures were fabricated by spark plasma sintering technology. We have studied the effect of the fractal structure of alumina ceramics on the mechanical properties of composites. The compression strength of samples was measured by a universal testing machine and the torsional properties of samples were measured by a torsional modulus meter. The results show that a fractal structure improves the compressive strength of aluminum/alumina ceramic composites by 10.97% and the torsional properties by 17.45%. The results of the study will provide a new method for improving the mechanical properties of materials.

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“…In the area of fractals, AM has also been involved in recent decades. Fractals have been 3Dprinted for art and decoration purposes [6], the construction of tunable properties devices [7,8], the construction of modern telecommunication electronic devices [9][10][11], and shock energy absorption elements [12]. Furthermore, in the field of the fluid dynamics, 3D-printed fractals have been reported to study the behavior of the permeability on fractal porous media [13].…”

Section: Introductionmentioning

confidence: 99%

Creep Properties of a Viscoelastic 3D Printed Sierpinski Carpet-Based Fractal

Pascual-Francisco,

Susarrey-Huerta,

Farfan-Cabrera

et al. 2023

Fractal Fract

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In this paper, the phenomenon of creep compliance and the creep Poisson’s ratio of a 3D-printed Sierpinski carpet-based fractal and its bulk material (flexible resin Resione F69) was experimentally investigated, as well as the quantification of the change in the viscoelastic parameters of the material due to the fractal structure. The samples were manufactured via a vat photopolymerization method. The fractal structure of the samples was based on the Sierpinski carpet at the fourth iteration. In order to evaluate the response of both the fractal and the bulk material under the creep phenomenon, 1 h-duration tensile creep tests at three constant temperatures (20, 30 and 40 °C) and three constant stresses (0.1, 0.2 and 0.3 MPa) were conducted. A digital image correlation (DIC) technique was implemented for strain measurement in axial and transverse directions. From the results obtained, the linear viscoelastic behavior regime of the fractal and the bulk material was identified. The linear viscoelastic parameters of both fractal and bulk materials were then estimated by fitting the creep Burgers model to the experimental data to determine the effect of the fractal geometry on the viscoelastic properties of the samples. Overall, it was found that the reduction in stiffness induced by the fractal porosity caused a more viscous behavior of the material and a reduction in its creep Poisson’s ratio, which means an increase in the compliance of the material.

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Design, additive manufacturing, and characterisation of a three-dimensional cross-based fractal structure for shock absorption

Cited by 16 publications

References 45 publications

Computational Model for Tree-like Fractals Used as Internal Structures for Additive Manufacturing Parts

Computational Model for Tree-like Fractals Used as Internal Structures for Additive Manufacturing Parts

Effect of Fractal Ceramic Structure on Mechanical Properties of Alumina Ceramic–Aluminum Composites

Creep Properties of a Viscoelastic 3D Printed Sierpinski Carpet-Based Fractal

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