Publication detail

Biaxial porosity gradient and cell size adjustment improve energy absorption in rigid and flexible 3D-printed reentrant honeycomb auxetic structures

ŠTAFFOVÁ, M. ONDREÁŠ, F. ŽÍDEK, J. JANČÁŘ, J. LEPCIO, P.

Original Title

Biaxial porosity gradient and cell size adjustment improve energy absorption in rigid and flexible 3D-printed reentrant honeycomb auxetic structures

Type

journal article in Web of Science

Language

English

Original Abstract

This paper compares different uniaxial and biaxial graded designs of auxetic reentrant honeycomb structures to enhance their mechanical properties, especially the specific energy absorption under compressive load. The lattice structures were 3D printed using the vat photopolymerization masked-stereolithography technique from two different materials - tough (OR) and flexible (FR). The results were evaluated from a material and structural point of view, investigating the effect of porosity, cell number, size, graded design, and fracture mode. The universally best energy-absorbing performance was found in a biaxially graded structure with a center-wise location of the highest local porosity. Depending on the used resin, its energy absorption capacity was up to 2-3 times enhanced compared to a reference uniform-porosity auxetic design. The presented data constitutes a fundamental understanding of auxetic structures and identifies practical approaches for tuning the auxetic structures' performance regarding their mechanical response. Finally, this study demonstrates the potential of shape versatility offered by 3D printing and other additive manufacturing techniques.

Keywords

Reentrant auxetic structure; Modelling; Mechanical testing; Simulation; Fracture

Authors

ŠTAFFOVÁ, M.; ONDREÁŠ, F.; ŽÍDEK, J.; JANČÁŘ, J.; LEPCIO, P.

Released

1. 6. 2024

Publisher

ELSEVIER

Location

AMSTERDAM

ISBN

2590-1230

Periodical

Results in Engineering

Year of study

22

Number

102249

State

Kingdom of the Netherlands

Pages from

1

Pages to

13

Pages count

13

URL

https://www.sciencedirect.com/science/article/pii/S2590123024005048?via%3Dihub

BibTex

@article{BUT189995,
  author="Martina {Štaffová} and František {Ondreáš} and Jan {Žídek} and Josef {Jančář} and Petr {Lepcio}",
  title="Biaxial porosity gradient and cell size adjustment improve energy absorption in rigid and flexible 3D-printed reentrant honeycomb auxetic structures",
  journal="Results in Engineering",
  year="2024",
  volume="22",
  number="102249",
  pages="13",
  doi="10.1016/j.rineng.2024.102249",
  issn="2590-1230",
  url="https://www.sciencedirect.com/science/article/pii/S2590123024005048?via%3Dihub"
}