Optimizing an auxetic metamaterial structure for enhanced mechanical energy absorption: Design and performance evaluation under compressive and impact loading

Journal of Sandwich Structures & Materials, Год журнала: 2024, Номер 26(7), С. 1129 - 1164

Опубликована: Авг. 18, 2024

Auxetic metamaterials, characterized by their negative Poisson’s ratio, offer promising prospects for utilization in absorbing energy during quasi-static compressive loading as well applications requiring impact absorption. The optimization of auxetic structures’ geometrical parameters can improve performance. This research aims to optimize the design an structure maximum specific absorption and investigate its behavior under high-velocity loading. cross-petal are optimized using genetic algorithm a neural network surrogate model. is examined compared with that basic finite element simulations. then evaluated core sandwich panel, two plates placed front rear. Simulations projectile impacts at velocities ranging from 100 250 m/s reveal panel’s behavior. Results indicate 69.82% increase capacity In impact, panel optimal outperforms one core. At more than minimum perforation velocity, contributes about 64%–67% total absorbed panel.

Язык: Английский

An improved in-plane dynamics analysis of auxetic star structures enhanced with self-similar inclusions

Journal of Applied Physics, Год журнала: 2025, Номер 137(7)

Опубликована: Фев. 18, 2025

This paper presents an extensive mechanical and deformation characterization of the stiffness energy harvesting proposed modified star-shaped auxetic honeycomb structure (MAHS), reinforced with self-similar inclusions (SSIs). The consequences two SSI arrangements (MAHS-I MAHS-II) on crashworthiness performance MAHS are systematically investigated in a comparative manner. Quasi-static uniaxial compression tests were conducted to verify theoretical models MAHS, experimental results good agreement. A series parametric studies revealed that MAHS-I exhibits better auxeticity at high speeds, while opposite is true for stiffness. apex angle apical show facilitating weakening actions, respectively, MAHS. Compared conventional structure, both consistent greatly promoted. study provides effective feasible solution design new structures contributes application metamaterials shielding engineering.

Язык: Английский

Energy absorption of auxetic honeycomb with graded beam thickness based on Bezier curve

Aerospace Science and Technology, Год журнала: 2024, Номер unknown, С. 109619 - 109619

Опубликована: Сен. 1, 2024

Язык: Английский