Effect of strut cross section and strut defect on tensile properties of cubic cellular structure

Raghavendra, Sunil; Molinari, A.; Fontanari, V.; Dallago, Michele; Luchin, Valerio; Zappini, Gianluca; Benedetti, M.

doi:10.1002/mdp2.118

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…The struts in the FE model were elliptical in cross-section with an increased thickness as discussed in the article under publishing. 52 The porosity of the FE model was similar to the measured porosity values. A 5 × 5 × 5 FE model was used in order to simulate the tensile and compression test in the elastic region.…”

Section: Methodssupporting

confidence: 72%

Tension-compression asymmetric mechanical behaviour of lattice cellular structures produced by selective laser melting

Raghavendra

Molinari

Fontanari

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Additive manufacturing is an evolving technology for fabricating porous structures used in a broad array of applications, ranging from the aerospace industry to biomedical engineering. Porous titanium alloy (Ti6Al4V) structures play a major role in biomedical implants and are preferred over conventional solid implants because their properties can be tailored to obtain the stiffness required to avoid stress shielding and improve osteointegration. The mechanical properties of these structures are dependent on unit cell topology and overall porosity. In the present work, three open cellular configurations were studied, namely regular (square), irregular (skewed square) and fully random structures, at three different porosity levels. The samples were manufactured using the selective laser melting of spherical Ti6Al4V powder. The deviations of manufactured samples from as designed were assessed using morphological characterisations and porosity analyses. The mechanical characterisations of the samples included monotonic and cyclic tensile tests, along with conventional compression tests under monotonic and cyclic conditions. The results from the study indicate a clear deviation of thickness values from as-designed values. The effect of inclination of the strut with respect to the loading axis has been studied in compression samples. The off-axis loading in compression led to the asymmetry in the Young's modulus in compression and tension. These led to finite element modelling of structures in the elastic regime and its validation using Gibson–Ashby model for cellular structures.

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Section: Methodssupporting

confidence: 72%

Tension-compression asymmetric mechanical behaviour of lattice cellular structures produced by selective laser melting

Raghavendra

Molinari

Fontanari

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

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“…Muller et al [107] found that a certain level of randomization improves the mechanical properties while Raghavendra et al [108] reported regular structures having higher values of strength. Other works tested lattice structures to compare their properties with the natural bone [7,87] or to validate the related FEM simulation [120,121].…”

Section: Tensile Testmentioning

confidence: 99%

Mechanical characterization and properties of laser-based powder bed–fused lattice structures: a review

Riva

Ginestra

Ceretti

2021

Int J Adv Manuf Technol

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The increasing demand for a wider access to additive manufacturing technologies is driving the production of metal lattice structure with powder bed fusion techniques, especially laser-based powder bed fusion. Lattice structures are porous structures formed by a controlled repetition in space of a designed base unit cell. The tailored porosity, the low weight, and the tunable mechanical properties make the lattice structures suitable for applications in fields like aerospace, automotive, and biomedicine. Due to their wide-spectrum applications, the mechanical characterization of lattice structures is mostly carried out under compression tests, but recently, tensile, bending, and fatigue tests have been carried out demonstrating the increasing interest in these structures developed by academy and industry. Although their physical and mechanical properties have been extensively studied in recent years, there still are no specific standards for their characterization. In the absence of definite standards, this work aims to collect the parameters used by recent researches for the mechanical characterization of metal lattice structures. By doing so, it provides a comparison guide within tests already carried out, allowing the choice of optimal parameters to researchers before testing lattice samples. For every mechanical test, a detailed review of the process design, test parameters, and output is given, suggesting that a specific standard would enhance the collaboration between all the stakeholders and enable an acceleration of the translation process.

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Influence of processing parameters on AlSi10Mg lattice structure during selective laser melting: Manufacturing defects, thermal behavior and compression properties

Zhang

Chen

et al. 2023

Optics & Laser Technology

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Effect of strut cross section and strut defect on tensile properties of cubic cellular structure

Cited by 4 publications

References 17 publications

Tension-compression asymmetric mechanical behaviour of lattice cellular structures produced by selective laser melting

Tension-compression asymmetric mechanical behaviour of lattice cellular structures produced by selective laser melting

Mechanical characterization and properties of laser-based powder bed–fused lattice structures: a review

Influence of processing parameters on AlSi10Mg lattice structure during selective laser melting: Manufacturing defects, thermal behavior and compression properties

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