In-plane elasticity of a strengthened re-entrant honeycomb cell

Baran, Tarık; Öztürk, Mitat

doi:10.1016/j.euromechsol.2020.104037

Cited by 48 publications

(9 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hur et al [30] showed numerically and experimentally that the bending and torsional stiffness of auxetic tubular structures can be determined by changing the porosity of the structures. Baran and Öztürk [31] added stiffeners into a traditional re-entrant structure to show an advancement in the stiffness value of the unit cell and revealed the need for enhanced stiffness of auxetic structures. Auxetic tubular structures with high stiffness consisting of square unit cells were designed by Ruan et al [32].…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of peanut-shaped tubular auxetics with enhanced stiffness: a finite element study

Solak¹,

Orhan²

2022

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

Auxetic materials or structures possess a negative Poisson's ratio in contrast to conventional materials, and they shrink or expand transversely under uniaxial compression or tension, respectively. These unique deformation features leads to enhance the mechanical properties compared with the conventional materials. Auxetic tubular structures are of significant interest in the literature because of their superior mechanical qualities, applicability and extensive application. Various auxetic tubular structures with different geometries have been proposed and examined before including conventional peanut-shaped tubular structures. However, application of the peanut-shaped structures is limited due to their low stiffness. In this study, it is aimed to enhance the stiffness of the peanut-shaped tubular auxetic by either adding stiffener to the conventional structure or rotating the unit cell of the structure by a certain angle. Also, the effect of the above-mentioned modifications on the Poisson’s ratio of the structure is investigated. A total of twelve different peanut-shaped auxetics are modelled and the elastic behaviour of these structures under uniaxial compression is compared numerically using finite element simulation. As a result of this analysis, it is observed that both the Poisson’s ratio and stiffness values obtained from the models utilising stiffener were higher than the values obtained from their conventional counterparts. Besides, it is seen that the stiffness values increased while the Poisson’s ratios decreased with the rotation of the unit cell in all of the peanut-shaped tubular auxetics.

show abstract

Section: Introductionmentioning

confidence: 99%

Performance evaluation of peanut-shaped tubular auxetics with enhanced stiffness: a finite element study

Solak¹,

Orhan²

2022

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…Since several researchers [11,52,53] have developed analytical methods to investigate the deformation of designs presented in the present study, the cellular deformation theory is not presented here. For example, Hedayati et al [11] developed analytical solutions for 2D re-entrant hexagonal honeycombs, which are valid for positive (honeycomb design) to negative (re-entrant) internal cell interior angle.…”

Section: Verification Studymentioning

confidence: 99%

Metamaterial boat fenders with supreme shape recovery and energy absorption/dissipation via FFF 4D printing

Bodaghi,

Namvar,

Yousefi

et al. 2023

Smart Mater. Struct.

View full text Add to dashboard Cite

In shipping, a fender acts like a bumper to absorb the kinetic energy of a boat berthing against a jetty, pier wall, or other boats. They have high energy absorption and low reaction forces, preventing damage to boats and berthing structures. The aim of this paper is to introduce a novel conceptual design for a new class of lightweight boat-fendering systems with superior energy absorption/dissipation and shape recovery features. Different metamaterials with honeycomb, re-entrant, and re-entrant chiral auxetic patterns are designed in the form of boat fender panels, and their thermo-mechanical behaviors are analyzed experimentally and numerically. A finite element modeling (FEM) is developed to investigate the compressive behaviors of boat fenders. Some of designs are 4D printed by fused filament fabrication of shape memory Polylactic Acid (PLA) polymers and then tested thermo-mechanically. A good correlation is observed between numerical and experimental results, supporting the FEM accuracy. Results reveal that proposed boat fenders have considerable energy absorption/dissipation along with the capability to fully recover plastic deformations by simply heating up. The excellent mechanical properties recovery of the proposed boat-fendering system is also shown under cycling loadings. Due to the absence of similar conceptual designs, models, and results in the specialized literature, this paper is expected to be instrumental towards 4D printing novel boat fenders with supreme energy absorption/dissipation and shape recovery properties promoting sustainability.

show abstract

“…Although these lattices are physically very different, it will be shown that their mechanical behaviour can be quantified using a unified analytical formulation. Current works on 2D lattices are dominated by straight beam-element members to explore the behaviour of regular as well as auxetic hexagonal lattices [32,33]. With the straight structural members, the design space of modifying the equivalent Young's moduli and Poissons ratio is limited.…”

Section: Introductionmentioning

confidence: 99%