Effective stiffness and effective compressive yield strength for unit-cell model of complex truss

Choi, Jeongho; Chae, Tae-Soo

doi:10.1007/s10999-014-9267-9

Cited by 14 publications

(5 citation statements)

References 7 publications

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“…Three unit cells [Triangular (T), Cubic (C), and Hexagonal (H)] are used to construct lattice structures with the same relative density (RD) [6], the same base areas A (AT, AC, AH) of the unit cells and equal dimensions of the struts of the three unit cells.…”

Section: Simulation Demonstrationsmentioning

confidence: 99%

“…Lightweight design is one area that AM achieves well where it is impractical for other conventional fabrication technologies [1][2][3]. Currently there are two main methods of lightweight design, including cellular structure with unit cell [4][5][6] and topology optimization with advanced algorithm [2,3,7]. Topology optimization has only been used for maximum stiffness design to date but lacks sufficient capabilities for hierarchical design integrations at multiple scales [1].…”

Section: Introductionmentioning

confidence: 99%

“…These periodic cellular lattice structures are advantageous in high performance features such as high specific stiffness and high strength, as well as the possibility of tailoring their properties by designing appropriate cell architecture [6,10]. By imagining a procedure to re-orienting the lattice elements, it is possible to make the lattice conform to principal stress direction [2], accomplishing the design and fabrication of lightweight parts.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on load-bearing capabilities of beam-like lattice structures with three different unit cells

Niu

Choo

Sun

et al. 2017

Int J Mech Mater Des

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The design and analysis of lattice structures manufactured using Additive Manufacturing (AM) technique is a new approach to create lightweight high-strength components. However, it is difficult for engineers to choose the proper unit cell for a certain function structure and loading case. In this paper, three beam-like lattice structures with triangular prism, square prism and hexagonal prism were designed, manufactured by SLM process using AlSi10Mg and tested. The mechanical performances of lattice structures with equal relative density, equal base area and height, and equal length for all unit cells were conducted by Finite Element Analysis (FEA). It was found that effective Young's modulus is proportional to relative density, but with different affecting levels. When the lattice structures are designed with the same relative density or the same side lengths, the effective Young's modulus of lattice structure with triangular prism exhibits the maximum value for both cases. When the lattice structures are designed with the same base areas for all unit cells, the effective Young's modulus of lattice structures with square prism presents the maximum. FEA results also show that the maximum stress of lattice structures with triangular prisms in each comparison is at the lowest level and the stiffness-to-mass ratio remains at the maximum value, showing the overwhelming advantages in terms of mechanical strength. The excellent agreements between numerical results and experimental tests reveal the validity of FEA methods applied. The results in this work provide an explicit guideline to fabricate beam-like lattice structures with the best tensile and bending capabilities.

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Section: Simulation Demonstrationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical study on load-bearing capabilities of beam-like lattice structures with three different unit cells

Niu

Choo

Sun

et al. 2017

Int J Mech Mater Des

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“…The open-type strut-based lattice structure can enhance mechanical qualities with controlled stiffness, more excellent SEA, and more extended plateau stresses than closed shell-based lattice structures 11 . Several publications 12 , 13 summarise the current level of knowledge about the mechanical behaviour and structure of cells. Other publications 14 – 16 provide examples of cellular structures' design, creation, and testing for uses.…”

Section: Introductionmentioning

confidence: 99%

Prediction and experimental validation approach to improve performance of novel hybrid bio-inspired 3D printed lattice structures using artificial neural networks

Doodi

Murali

2023

Sci Rep

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Novel Cellular lattice structures with lightweight designs are gaining more interest in the automobile and aerospace sectors. Additive manufacturing technologies have focused on designing and manufacturing cellular structures in recent years, increasing the versatility of these structures because of the significant benefits like high strength-to-weight ratio. In this research, a novel hybrid type of cellular lattice structure is designed, bio-inspired from the circular patterns seen in the bamboo tree structure and the overlapping patterns found on the dermal layers of fish-like species. The unit lattice cell with varied overlapping areas with a unit cell wall thickness of 0.4 to 0.6 mm. Fusion 360 software models the lattice structures with a constant volume of 40 × 40 × 40 mm. Utilizing the stereolithography (SLA) process and a vat polymerization type three-dimensional printing equipment is used to fabricate the 3D printed specimens. A quasi-static compression test was carried out on all 3D printed specimens, and the energy absorption capacity of each structure was calculated. Machine learning technique like the Artificial neural network (ANN) with Levenberg–Marquardt Algorithm (ANN-LM) was applied to the present research to predict the energy absorption of the lattice structure with parameters such as overlapping area, wall thickness, and size of the unit cell. The k-fold cross-validation technique was applied in the training phase to get the best training results. Overall, the results obtained using the ANN tool are validated and can be a favourable tool for lattice energy prediction with available data.

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“…Engineers and scientists have developed several applications of PCMs. Choi, et al [3,4,5,6] created a unit cell model with a truss and developed a complex structure and unit cell models such as corrugated wire mesh laminate and pinwheel trusses. The development of a new unit cell model is the most important aspect for building a sandwich core structure.…”

Section: Introductionmentioning

confidence: 99%

Expected Ideal Solution and Verified By Numerical Analysis for a Triangular Unit Cell Model

Choi¹

2018

IJARA

Self Cite

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This study aims to provide critical information regarding the development of ultralight materials with tailored properties using a triangular unit cell model. Three different types of triangular unit cells (or triangular prism unit cells, e.g. OST, OTT, and CTT) were studied via finite element analysis to calculate and compare their relative density, stiffness, and strength. The relative stiffness and strength were extracted under a compression load. The ideal solutions were calculated using commercial finite element analysis software and then compared to the ideal Gibson-Ashby solution. The relative Young's modulus and the relative yield strength for the three different unit cell models are shown to differ from the ideal solution of the Gibson-Ashby theory. In conclusion, the effective stiffness of the OTT and CTT is higher than that of the Gibson-Ashby model. When the relative density is more than 0.1, the OTT and CTT have higher yield strength. OTT and CTT have a higher plastic strength when the relative density is more than 0.03-0.05. For aerospace or automobile use, further study is needed to find the optimum truss and aperture sizes and shape of the unit model.

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Effective stiffness and effective compressive yield strength for unit-cell model of complex truss

Cited by 14 publications

References 7 publications

Numerical study on load-bearing capabilities of beam-like lattice structures with three different unit cells

Numerical study on load-bearing capabilities of beam-like lattice structures with three different unit cells

Prediction and experimental validation approach to improve performance of novel hybrid bio-inspired 3D printed lattice structures using artificial neural networks

Expected Ideal Solution and Verified By Numerical Analysis for a Triangular Unit Cell Model

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