Topology-optimized hybrid solid-lattice structures for efficient mechanical performance

Teimouri, Mohsen; Mahbod, Mahshid; Asgari, Masoud

doi:10.1016/j.istruc.2020.11.055

Cited by 37 publications

(8 citation statements)

References 39 publications

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“…Some of these works combines the finite element method in a three-dimensional form with artificial intelligence algorithms 20 or evolutionary algorithms. 21–23 An additional advantage is the fact that this type of plate is easier to make, whether in 3D printing or prefabricated technology. As a side note, the post-optimization stage, which allows for construction of the real structure in case of optimization of a topology based on volumetric finite elements, is a complex issue and requires many simplifications and idealization.…”

Section: Introductionmentioning

confidence: 99%

Optimization on compressive strength of sandwich plates with internal arborescent microstructure

Wirowski,

Kowalczyk

2023

Jnl of Sandwich Structures & Materials

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The subject of this work is the optimization of a topology for sandwich plates with an internal arborescent microstructure. Here, we propose a parametric approach to the optimization using visual programming methods in the Dynamo Sandbox environment. An internal structure of the sandwich plate was optimized in terms of minimizing the weight of the entire structure in relation to the compressive strength. Several variable parameters in the optimization process were applied: lengths of individual tree levels, their cross-sections and locations of nodes. To validate obtained results of the optimization process, a 3D model of the plate was printed and tested on compressive strength. The results were also analysed and compared with other authors’ research.

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Section: Introductionmentioning

confidence: 99%

Optimization on compressive strength of sandwich plates with internal arborescent microstructure

Wirowski,

Kowalczyk

2023

Jnl of Sandwich Structures & Materials

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“…They verified the design theory and superiority of this hybrid multimode lattice structure with a three-point bending beam [ 23 ]. Teimouri et al assembled a topology-optimized solid structure from various lattice structures obtained via a method based on bidirectional evolutionary structure optimization (BESO) [ 24 ]. Accordingly, they built a new hybrid solid–lattice structure, and demonstrated the superiority of the structure through stiffness, modal, and quasi-static finite element analysis (FEA) [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Solid Stress-Distribution-Oriented Design and Topology Optimization of 3D-Printed Heterogeneous Lattice Structures with Light Weight and High Specific Rigidity

Shen

2022

Polymers

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Lightweight structural design is greatly valued in the aviation, aerospace, and automotive industries. Three-dimensional (3D) printing techniques provide viable and popular technical pathways for the rapid design and manufacturing of lightweight lattice structures. Unlike the conventional design idea of a geometrically homogenized lattice structure, this work provides a design method for structurally heterogeneous lattice according to the spatial stress state of 3D-printed parts. Following the quasi-static stress numerical simulations of solid components, finite element mesh units were inconsistently replaced by lattice units with different specific rigidities corresponding to the localized stress levels. Relying on the topology optimization further lightened the lattice structure under quasi-static stress after removing some parts with extremely low stress from the overall structure. As an embodiment of this design idea, face-centered cubic (FCC) lattice units with different strut diameters were employed to non-uniformly and adaptively fill a solid part under localized loading. The topological optimization was conducted on the solid part globally. Then, the topologically optimized solid and the heterogeneous lattice structure were subjected to the geometric Boolean operation. Stereolithographic 3D printing was utilized to fabricate the homogeneous and heterogeneous lattice structural parts for comparative tests of three-point bending. Three evaluation indicators were defined for the standardized assessment of the geometrically complex lattice structures for the performance evaluation. This demonstrated that the heterogeneous lattice part exhibited better comprehensive mechanical performance than the uniform lattice. This work proved the feasibility of this new perspective on 3D-printed lightweight structure design and topology optimization.

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“…Due to the designability of the lattice structure, the researchers carried out optimization based on the previous research results, using theoretical and numerical optimization methods to design and propose a new lattice structure, which mechanical properties are significantly improved compared with the traditional structure. Based on the Bidirectional Evolutionary Structural Optimization (BESO) method, Teimouri et al 15 combined grid wireframes based on different support structures into a topology-optimized solid structure. The results show that the mechanical properties of the new hybrid solid lattice structure in terms of stiffness, buckling failure load and energy absorption are improved compared with pure solid structure and lattice structure.…”

Section: Introductionmentioning

confidence: 99%

Compression Behavior of 3D Printed Polymer TPU Cubic Lattice Structure

Zhang

Deng

et al. 2022

Mat. Res.

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Based on the face-centered cubic structure, several different types of cubic lattice structures are designed in this paper, the quasi-static compression behavior of the lattice structure is thoroughly investigated by finite element simulation and experimental testing, in which mechanical properties and energy absorption capacities are summarized. The experimental specimens made from thermoplastic polyurethane TPU are additively manufactured using the fused deposition technology. Effects of strut style, strut distance, arrangement form, curvature, and several honeycomb lattice structures are considered. The results show that: under the condition of the same relative density, the selection of sinusoidal struts with larger curvature, the arrangement of 45°/135°, and the inward gradient of the strut distance can all improve the energy absorption characteristics of the structure. Compared with the traditional face-centered cubic structure (specimen L-1), the SEA of the structure with the strut curvature of 0.25, the 45°/135° arrangement of the sinusoidal struts, and the inward gradient of the strut distance is improved by 64% , 190%, and 107%; the introduction of a honeycomb structure with a high relative density can effectively resist the buckling deformation of the structure, and the SEA of the triangular, re-entrant and hexagonal honeycomb structures are 354%, 603% and 548% higher than that of the basic structure, respectively. In addition, reducing the lattice height also resists destabilization.

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Topology-optimized hybrid solid-lattice structures for efficient mechanical performance

Cited by 37 publications

References 39 publications

Optimization on compressive strength of sandwich plates with internal arborescent microstructure

Optimization on compressive strength of sandwich plates with internal arborescent microstructure

Solid Stress-Distribution-Oriented Design and Topology Optimization of 3D-Printed Heterogeneous Lattice Structures with Light Weight and High Specific Rigidity

Compression Behavior of 3D Printed Polymer TPU Cubic Lattice Structure

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