Bio-inspired design and 4D Printing of Multi‐stiffness Wavy Metamaterial Energy Absorbers/Dissipators with Shape Recovery Features

Engineering Structures, Journal Year: 2025, Volume and Issue: 327, P. 119538 - 119538

Published: Jan. 6, 2025

Language: Английский

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Vibration Control in Bolted Joints with Locally Resonant Metamaterials

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: unknown, P. 109999 - 109999

Published: Jan. 1, 2025

Language: Английский

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On the role of surface elasticity in nonlinear planar stability of FG porous reinforced nanosize curved beams having different degrees of curvature

European Journal of Mechanics - A/Solids, Journal Year: 2024, Volume and Issue: 107, P. 105384 - 105384

Published: July 21, 2024

The prime target of the present study is to inspect role surface elasticity at nanoscale in changing stability branches as well lower and upper limit loads uniformly thermomechanical loaded curved nanobeams having different degrees curvature. To this end, classical elastic-based multiple equilibria are predicted for nanosized third-order shear flexible clamped beams consisted through-thickness functionally graded porosity with schemes besides reinforcing by graphene nanofillers. established nanoscale-dependent nonlinear formulations then solved numerically aid isogeometric collocation technique creating a distinct grid points allocated contemplated basis assortments individually via Greville abscissas. It deduced that taking temperature escalation into account, along applied sidewise uniform pressure, prominence stress effects on quantity load reduces, while them enhances. These anticipations become more prominent FGP reinforced nanobeam possessing less degree Accordingly, owning small-curved nanobeam, increasing amount from 150°C 300°C, turns down 16.90% 1.51% if h=15nm, 6.76% 0.38% h=30nm, 2.48% 0.07% h=60nm. While gets higher 48.69% 138.25% 22.70% 83.95% 8.89% 22.91% Owning medium-curved rise 14.98% 12.68% 7.09% 6.03% 2.84% 2.41% Alternatively, large-curved 22.30% 21.15% 10.38% 9.82% 4.11% 3.87%

Language: Английский

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High‐efficiency design of multifunctional radar absorbing honeycomb structures for enhanced ultrathin, broadband, and load‐bearing performance

Polymer Composites, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 13, 2025

Abstract With the rapid advancements in anti‐stealth technology and electronic reliability, radar absorbing structures urgently need to achieve electromagnetic‐mechanical enhancement. However, drawback of current frequency selective surface (FSS) film still affects interfacial strength structures, limiting improvement mechanical performance. This work proposed an ultrathin, broadband, load‐bearing integrated honeycomb structure (RAHS), fabricated via a high‐efficiency multi‐manufacturing approach, replacing traditional FSS film. The result reveals that optimizing structural geometry resistance interlocked functional (F‐HC), FSS‐laminate, polylactic acid lattice cores, optimal RAHS can excellent absorption bandwidth 35.30 GHz (absorptivity>87%) under TE polarization at thickness only 9 mm with density 0.55 kg m −3 as well possess outstanding compressive 21.9 MPa energy 6.43 MJ , increasing 200% compared RASH (without cores). Notably, electromagnetic mechanism demonstrates synergistic effects originate from loss capabilities F‐HC L‐C resonance between square loop patch, gradient impedance matching FSS‐laminate cores. multi‐stage effect hexagonal cores significantly enhances provides pathway for achieving high‐performance structures. Highlights is designed integration. approach effectively resolved drawbacks Filling enhanced by 200%, 793%. performance RAHS. Electromagnetic synergy improved broadband

Language: Английский

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Resilient and fatigue-resistant hybrid fiber aerogel with oriented pore structure for broadband frequency sound absorption

Composites Science and Technology, Journal Year: 2024, Volume and Issue: 261, P. 111004 - 111004

Published: Dec. 10, 2024

Language: Английский

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High strength and high damping CFRP composites with co‐curing viscoelastic sandwich film

Polymer Composites, Journal Year: 2024, Volume and Issue: 45(13), P. 11619 - 11634

Published: May 29, 2024

Abstract The high temperature co‐curing damping composite was investigated by technology to improve the mechanical property and performance of traditional fiber reinforced resin matrix composite. Fluororubber with stable chemical properties high‐temperature resistance used as core layer novel carbon bismaleimide High‐temperature Co‐curing Damping Sandwich Composites (HCDSC). curing time fluororubber were consistent that adjusting formula. viscoelastic thermal stability zinc methacrylate in detail. Static tests, modal tests interfacial shear prove HCDSC display excellent properties. microscopic analysis reveals sandwich materials are closely bonded composites. dynamic characteristics plate fixed support on four sides is analyzed theoretically, vibration equilibrium equation derived combining first‐order deformation theory, variational principle, Hamilton principle. discussed through verify accuracy theoretical derivation. This research great significance solve problem structural dynamics, provides a new idea for design functional materials. Highlights A material large strength prepared. structures studied. free explored via experiment theory.

Language: Английский

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Mechanical Behavior of 3D-Printed Thickness Gradient Honeycomb Structures

Materials, Journal Year: 2024, Volume and Issue: 17(12), P. 2928 - 2928

Published: June 14, 2024

In order to obtain a lightweight, high-strength, and customizable cellular structure meet the needs of modern production life, mechanical properties four thickness gradient honeycomb structures were studied. this paper, types specimens with same porosity different Poisson's ratios designed manufactured by using SLA 3D-printing technology, including honeycomb, square quasi-square re-entrant structures. Based on plane compression failure mode analysis these specimens, is applied structure, structural forms are formed. The experimental results show that exhibits better than uniform wall thickness. studied whole can be significantly improved increasing cell walls at upper lower ends structure. thickness, arrangement order, shape, ratio all have significant impact specimens. These provide an effective basis for design application in future.

Language: Английский

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Effect of hierarchical structure on the shape recovery properties and load-carrying capacity of 4D-printed kirigami-inspired honeycomb

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 17, 2025

Kirigami-inspired honeycomb structures demonstrate outstanding self-expanding capabilities and exceptional mechanical properties. To further enhance the shape recovery properties load-carrying capacity of kirigami-inspired honeycomb, hierarchical structure is introduced by importing porous into cell walls 4D-printed (Structure II), then an innovative I) designed for achieving effect. Additionally, three with different configurations III–V) are also comparing traditional Structure II. The finite element analysis experiments conducted to compare compression deformation behavior energy absorption I–V. It found that I exhibits significantly improved compared stiffness increased 50.43%, performance 65.00%. time has been shortened 27.27% it a better rate. III–V can performances IV best capacity, increase 76.25%. Thus, developed honeycombs have broad application prospects multifunctional applications in future.

Language: Английский

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Novel design of skin construction on the sound absorption of honeycomb sandwich panels

Composite Structures, Journal Year: 2025, Volume and Issue: unknown, P. 118870 - 118870

Published: Jan. 1, 2025

Language: Английский

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Additive Manufacturing of Continuous Carbon Fiber Honeycomb Structures with Tunable Poisson's Ratio

Advanced Engineering Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 8, 2025

This study investigates the mechanical performance of continuous carbon fiber reinforced composite (CCFRC) honeycomb structures with varying Poisson's ratios, fabricated using fused filament fabrication (FFF) technique. Three designs—star shaped (SS), concave hexagonal (CHH), and zero ratio (ZPR)—are evaluated through static compression experiments finite element simulations. The results show that SS a negative exhibits higher yield strength, faster densification, greater total energy absorption. In contrast, positive (PPR) demonstrates larger specific absorption, while ZPR are more stable in deformation. Notably, for same ratio, outperforms CHH terms mass increases 98.58% 101%, respectively. Scanning electron microscopy (SEM) analysis damage mechanisms during highlights influence unit cell design printing path planning on properties CCFRC components. These findings suggest behavior is highly dependent print planning, tensile failure typically leading to brittle fracture.

Language: Английский

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