Inverse Design of Energy‐Absorbing Metamaterials by Topology Optimization

Advanced Science, Год журнала: 2022, Номер 10(4)

Опубликована: Дек. 11, 2022

Compared with the forward design method through control of geometric parameters and material types, inverse based on target stress-strain curve is helpful for discovery new structures. This study proposes an optimization strategy mechanical metamaterials a genetic algorithm establishes topology energy-absorbing structures desired curves. A series structural mutation algorithms design-domain-independent mesh generation are developed to improve efficiency finite element analysis iteration. The realizes ideal structures, which verified by additive manufacturing experimental characterization. error between designed structure less than 5%, densification strain reaches 0.6. Furthermore, special attention paid passive pedestrian protection occupant protection, reasonable solution given multiplatform structure. proposed framework provides path elastic-plastic large deformation problem that unable be resolved using classical gradient or algorithms, simplifies process metamaterials.

Язык: Английский

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Breaking the Tradeoffs between Different Mechanical Properties in Bioinspired Hierarchical Lattice Metamaterials

Advanced Functional Materials, Год журнала: 2023, Номер 33(45)

Опубликована: Авг. 31, 2023

Abstract It is a long‐standing challenge to break the tradeoffs between different mechanical property indicators such as strength versus toughness in design of lightweight lattice materials. To tackle this challenge, hierarchical metamaterial with modified face‐centered cubic (FCC) cell configuration, inspired by glass sponge skeletal system, proposed. The proposed simultaneously possesses high strength, energy absorption, considerable toughness, well controllable deformation patterns through integration both bionic features double diagonal reinforcement and circular modification. compressive absorption can reach 69.13 MPa 53.39 J cm 3 , respectively. Furthermore, also exhibits exceptionally damage tolerance compared existing metamaterials comparable attenuating stress concentration that may cause catastrophic collapse. This approach combines advantages tensile‐dominated bending‐dominated lattices. Quantitatively, terms specific crushing force efficiency, FCC (MHCFCC) outperforms Octet 14.85%, 53.28%, 110.52%, multibionic feature provides advanced strategies for high‐performance architected promising application potential.

Язык: Английский

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Rational designs of mechanical metamaterials: Formulations, architectures, tessellations and prospects

Materials Science and Engineering R Reports, Год журнала: 2023, Номер 156, С. 100755 - 100755

Опубликована: Окт. 7, 2023

Язык: Английский

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Ultrastiff metamaterials generated through a multilayer strategy and topology optimization

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Апрель 6, 2024

Abstract Metamaterials composed of different geometrical primitives have properties. Corresponding to the fundamental forms line, plane, and surface, beam-, plate-, shell-based lattice metamaterials enjoy many advantages in aspects, respectively. To fully exploit each structural archetype, we propose a multilayer strategy topology optimization technique design metamaterial this study. Under frame strategy, space is enlarged diversified, freedom increased. Topology applied explore better designs larger diverse space. Beam-plate-shell-combined automatically emerge from achieve ultrahigh stiffness. Benefiting high stiffness, energy absorption performances optimized results also demonstrate substantial improvements under large deformation. The can bring series tunable dimensions for design, which helps desired mechanical properties, such as isotropic elasticity functionally grading material property, superior acoustic tuning, electrostatic shielding, fluid field tuning. We envision that broad array synthetic composite with unprecedented performance be designed optimization.

Язык: Английский

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Programmable and multistable metamaterials made of precisely tailored bistable cells

Materials & Design, Год журнала: 2023, Номер 227, С. 111810 - 111810

Опубликована: Март 1, 2023

This study proposes a systematic inverse design framework for constructing multistable mechanical metamaterials with programmable gradients. Herein, we designed the tailored bistable cells precisely controlled maximum instability forces through topology optimization approach. Then, structures were programmed to construct different target gradient snapping sequences and deformation models. Consequently, simulation experimental results showed feasibility of method, which successfully produced two- three-dimensional metamaterial functions. Finally, verified expected behaviors by testing specimens prepared via additive manufacturing. Overall, our findings show that proposed strategy offers new paradigm developing metamaterials.

Язык: Английский

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Energy absorption characteristics of TPMS-filled square tubes under quasi-static axial crushing

Thin-Walled Structures, Год журнала: 2024, Номер 199, С. 111811 - 111811

Опубликована: Март 17, 2024

Язык: Английский

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Modelling, optimization, and testing of novel cuboidal spherical plate lattice structures

Virtual and Physical Prototyping, Год журнала: 2024, Номер 19(1)

Опубликована: Янв. 31, 2024

This study investigates the mechanical behavior of a novel set Cuboidal Spherical Plate Lattice (CSPL) materials. The procedure constrained-domain topology optimization is implemented with aim enhancing stiffness. micromechanical finite element homogenization approach used to evaluate effective elastic-plastic properties CSPLs and their topologically optimized counterparts, TOCSPLs (Topologically Optimized Lattices). demonstrate higher uniaxial, shear, bulk moduli compared CSPLs, an increase 31%, 14%, 36% respectively. Moreover, there in yield strengths under hydrostatic loading conditions, enhancements 103%, 55%, 62%, topologies are additively manufactured through Fused Deposition Modeling (FDM) out ABS thermoplastic material. quasi-static compression experiments superiority TOCSPL 111+100 over other terms uniaxial modulus. suffix denotes crystallographic planar orientations which solid plate-like disks were formed within cubic system. proposed herein outperform certain types Triply Periodic Minimal Surface, honeycomb, truss-, plate-based lattice offer compelling justification for utilization applications that require load-bearing impact absorption capabilities.

Язык: Английский

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A ribbed strategy disrupts conventional metamaterial deformation mechanisms for superior energy absorption

Virtual and Physical Prototyping, Год журнала: 2024, Номер 19(1)

Опубликована: Апрель 8, 2024

Enhancing energy absorption in mechanical metamaterials has been a focal point structural design. Traditional methods often include introducing heterogeneity across unit cells. Herein, we propose straightforward ribbed strategy to achieve exceptional absorption. We demonstrate our concept through modified body-centered cubic (BCC) and face-centered (FCC) truss-lattice (BCCR FCCR). Using stainless-steel 316L samples, compression tests indicate 111% 91% increase specific (SEA) for BCCR FCCR, respectively, along with an enhancement strength by 61.8% 40.7%. Deformation mechanisms are comprehensively elucidated both finite element analysis theoretical calculations. The mitigation of stress concentration at nodes, redistribution load transfer pathways within struts, introduction multiple plastic hinges collectively contribute increased higher strength. rein-based polymer the also exhibit damage tolerance, experiencing only 15% loss maximum after cyclic 20% strain, while maintaining 73% SEA compared their non-ribbed counterpart. This extends beyond discussed structures, presenting itself as generic approach enhance plateau SEA.

Язык: Английский

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Tailoring Stress–Strain Curves of Flexible Snapping Mechanical Metamaterial for On‐Demand Mechanical Responses via Data‐Driven Inverse Design

Advanced Materials, Год журнала: 2024, Номер 36(33)

Опубликована: Июнь 22, 2024

By incorporating soft materials into the architecture, flexible mechanical metamaterials enable promising applications, e.g., energy modulation, and shape morphing, with a well-controllable response, but suffer from spatial temporal programmability towards higher-level intelligence. One feasible solution is to introduce snapping structures then tune their responses by accurately tailoring stress-strain curves. However, owing strongly coupled nonlinearity of structural deformation material constitutive model, it difficult deduce curves using conventional ways. Here, machine learning pipeline trained finite element analysis data that considers those nonlinearities tailor metamaterialfor on-demand response an accuracy 97.41%, conforming well experiment. Utilizing established approach, absorption efficiency snapping-metamaterial-based device can be tuned within accessible range realize different rebound heights falling ball, actuators spatially temporally programmed achieve synchronous sequential actuation single input. Purely relying on structure designs, tailored increase devices' tunability/programmability. Such approach potentially extend similar nonlinear scenarios predictable or intelligent responses.

Язык: Английский

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Design of broad quasi-zero stiffness platform metamaterials for vibration isolation

International Journal of Mechanical Sciences, Год журнала: 2024, Номер 281, С. 109691 - 109691

Опубликована: Авг. 29, 2024

Язык: Английский

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