Three-dimensional meta-architecture with programmable mechanical properties

Zhang, Qiangqiang; Dong, Jibao; Zhao, Yantang; Zheng, Yueyan

doi:10.1080/19475411.2022.2051640

Cited by 13 publications

(4 citation statements)

References 58 publications

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“…Thus, the length of ligaments is adequate to allow the peculiar chiral rotating mechanism, since the ratio h/d was equal to 5, according to those presented in the literature. 25,66 To ensure a prefect connection between the rotating units, whilst avoiding any localized high-stress concentrations, 67,68 the edges of the prismatic elements were filleted with a fixed radius equivalent to the value of the radius of the ligament' thickness.…”

Section: Chiral Structures Design and Prototypingmentioning

confidence: 99%

Geometrically tunable architected materials designed from prismatic rotating units

Sorrentino,

Castagnetti

2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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An exotic property of some mechanical metamaterials is their negative Poisson's ratio which is of interest for many applications, from biomedical to aeronautic. This work investigates how a mechanical metamaterial evolved from equilateral triangular rotating prisms changes its Poisson's ratio according to the orientation of the reference units with respect to the tensile loading direction (aligned or 45° rotated, respectively). Different configurations are investigated through kinematic analysis, which describes hinged couplings in the linked vertices of the prisms. The best configurations emerging from the kinematic analysis were converted into chiral architectures: Three-dimensional printed physical prototypes were tested under uniaxial compression and the results compared with finite element predictions. The experimental results showed a remarkably different deformation behaviour between the metamaterial designs, with a good qualitative agreement with the numerical simulations. High values of auxetic response are observed for the configuration whose cells are aligned with the load, while a low auxetic and less sensitive geometry variation behaviour was observed for the rotated cell architecture. This rotated configuration also exhibits the significant achievement of mechanical properties which are approximately independent of the geometry variations.

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Section: Chiral Structures Design and Prototypingmentioning

confidence: 99%

Geometrically tunable architected materials designed from prismatic rotating units

Sorrentino,

Castagnetti

2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Metamaterials are materials that exhibit extraordinary physical properties that natural materials do not possess, and these properties are mainly derived from special artificial structures [ 124 , 125 ]. Among the many special structures of metamaterials, those with a negative Poisson’s ratio effect are often used in the 4D printing of biomedical instruments (Fig.…”

Section: D-printed Structuresmentioning

confidence: 99%

“…Zhang et al. [ 125 ] designed a 3D lightweight meta-architecture consisting of 6 connected antichiral honeycombs (Fig. 8 C).…”

Section: D-printed Structuresmentioning

confidence: 99%

See 1 more Smart Citation

Shape Memory Polymer Composites: 4D Printing, Smart Structures, and Applications

Yan,

Zhang,

Luo

et al. 2023

Research

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Shape memory polymers (SMPs) and their composites (SMPCs) are smart materials that can be stably deformed and then return to their original shape under external stimulation, thus having a memory of their shape. Three-dimensional (3D) printing is an advanced technology for fabricating products using a digital software tool. Four-dimensional (4D) printing is a new generation of additive manufacturing technology that combines shape memory materials and 3D printing technology. Currently, 4D-printed SMPs and SMPCs are gaining considerable research attention and are finding use in various fields, including biomedical science. This review introduces SMPs, SMPCs, and 4D printing technologies, highlighting several special 4D-printed structures. It summarizes the recent research progress of 4D-printed SMPs and SMPCs in various fields, with particular emphasis on biomedical applications. Additionally, it presents an overview of the challenges and development prospects of 4D-printed SMPs and SMPCs and provides a preliminary discussion and useful reference for the research and application of 4D-printed SMPs and SMPCs.

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Design, Preparation, and Mechanical Property Investigation of Ti–Ta 3D‐Auxetic Structure by Laser Powder Bed Fusion

Gao

et al. 2023

Adv Eng Mater

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In recent years, Ti–Ta alloy has become a hot material in orthopedic implants. At the same time, the metal lattice structure with a negative Poisson's ratio has a great prospect in the application of implants due to its unique mechanical properties. Herein, an antichiral three‐dimensional polyhedron (A3P) lattice structure with negative Poisson's ratio is designed. This lattice structure is prepared by laser powder bed fusion (LPBF) technology using Ti–Ta alloy as the feedstock material. The surface morphology and relative density of the Ti–Ta samples built with different laser scanning speeds are compared for the optimization of the Ti–Ta's LPBF parameter. Then, the A3P structure of the Ti–Ta alloy is fabricated using the optimized LPBF parameters. The negative Poisson's ratio effect of the A3P structure is verified by finite element analysis (FEA) and compared with experimental results. The compression test results show that the yield strength and elastic modulus of the A3P structure are 9.2 MPa and 0.14 GPa, respectively, which is suitable for the orthopedics application. A3P structure has higher fracture energy compared with diamond structure, indicating it can absorb more energy in the fracture process. A3P shows a promising prospect in the application of orthopedics implantation.

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Three-dimensional meta-architecture with programmable mechanical properties

Cited by 13 publications

References 58 publications

Geometrically tunable architected materials designed from prismatic rotating units

Geometrically tunable architected materials designed from prismatic rotating units

Shape Memory Polymer Composites: 4D Printing, Smart Structures, and Applications

Design, Preparation, and Mechanical Property Investigation of Ti–Ta 3D‐Auxetic Structure by Laser Powder Bed Fusion

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