A Bioinspired Gradient Curved Auxetic Honeycombs with Enhanced Energy Absorption

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: unknown, P. 110189 - 110189

Published: March 1, 2025

Language: Английский

---

Wave propagation-based characterization of 3D-printed soft auxetic structures

Composite Structures, Journal Year: 2025, Volume and Issue: unknown, P. 118874 - 118874

Published: Jan. 1, 2025

Language: Английский

---

Energy absorption of 3D assembled auxetic meta-structure with compression-twisting effect

Structures, Journal Year: 2025, Volume and Issue: 73, P. 108482 - 108482

Published: Feb. 21, 2025

Language: Английский

---

Mechanical properties of novel uniform/gradient auxetic structures made of CFRP composites

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

Published: Feb. 19, 2025

Abstract Carbon fiber reinforced polymer (CFRP) auxetic composite structures have attracted an increasing attention in recent years due to their lightweight and superior mechanical properties compared with traditional structures. However, most of the reported all‐CFRP are often accompanied cliff‐like stress drops during failure process, resulting lower energy absorption. This paper reports design, fabrication characterization a novel type petal‐like lightweight, high‐strength, good absorptive properties. Four uniform/gradient were first made different angle values continuous CFRP composites. Then, properties, Poisson's ratio mechanism under quasi‐static compression loading analyzed. Based on experimental results, gradient structure constructed cells varying angles was further selected study its dynamic response initial impact energies positions. The results show that composites can maintain even large deformation. Impressively, these exhibit plateau phase compression, indicative exceptional absorption capabilities. low velocity point tests also displacement peak number peaks load–displacement curves significantly influenced by changes position energy. research offers valuable insight into developing fabricating characteristics. Highlights Auxetic high EA capacity designed fabricated. Their static loads studied. significant performance. exhibits abundant forms.

Language: Английский

---

Evaluation of tensile properties in in-plane auxetic carbon/epoxy and carbon-glass/epoxy composite laminates

Journal of Composite Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 12, 2025

Auxetic laminates, i.e. with a negative Poisson’s ratio (NPR), show great engineering promise, enhancements in shear resistance, fracture toughness, energy absorption, and delamination damage extension limitation. This study focuses on the tensile properties of in-plane (IP) NPR fibre-reinforced polymer (FRP) namely carbon/epoxy (C/E) carbon-glass/epoxy (C-G/E) lay-up sequences which maximised effect. An analytical was conducted to achieve maximum sequences. Laminates were manufactured via hand hot compression moulding techniques. ratios −0.33 −0.18 achieved for C/E C-G/E IP auxetic lay-ups, respectively. A 72% reduction longitudinal stiffness between unidirectional (UD) sequence verified, further 24% from configurations due less anisotropy G/E plies. Regarding strength, showed low failure strengths, 1213 MPa UD case, 209 studied laminates. alternative design analytically incorporation 0° layers sequences, improved stiffness, albeit at auxeticity. Further research is recommended explore influence enhancements.

Language: Английский

---

Vibration modals of composite auxetic honeycomb sandwich cylindrical shells

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

Published: March 25, 2025

Abstract The vibration modals of composite sandwich cylindrical shells with auxetic honeycomb cells arrayed in the circumferential direction and axial were studied theoretically numerically. equivalent moduli relative density cores derived validated. Subsequently, differences these physical quantities caused by number layers taken into consideration. Based on works, a verified third order shear deformation theory (TSDT) was applied to deduce free governing equations shells. Specially, effects deepness terms not ignored. To prove accuracy theory, four finite element modellings different numbers established for analysis. Additionally, modeled verify theory. frequencies calculated good fit those obtained from numerical method. Thus, influences dimensions discussed TSDT. sensitivity analysis showed that layers, radius shells, thickness had great influence Highlights deduced Effects stiffnesses core considered. modal studied.

Language: Английский

---

A decoupled and programmable on-demand design concept for acoustic-mechanical multifunctional structures

Applied Materials Today, Journal Year: 2025, Volume and Issue: 44, P. 102745 - 102745

Published: April 26, 2025

Language: Английский

---

Axial compression performance of honeycomb structure with diamond origami tube

Construction and Building Materials, Journal Year: 2025, Volume and Issue: 481, P. 141602 - 141602

Published: May 5, 2025

Language: Английский

---

Windmill-shaped metamaterials achieving negative thermal expansion

Engineering Structures, Journal Year: 2025, Volume and Issue: 336, P. 120488 - 120488

Published: May 8, 2025

Language: Английский

---

Mechanical response and stability of a novel crossed star honeycomb under inclined loading

Materials Today Communications, Journal Year: 2024, Volume and Issue: 41, P. 110348 - 110348

Published: Sept. 6, 2024

Language: Английский

---