Work

Fractal Analysis and Mechanical Characterization of 3D‐Printed Concave Hexagonal Structures With Negative Poisson's Ratio

Year: 2025

Type: article

Abstract: ABSTRACT Materials with a negative Poisson's ratio have gained attention for their unique mechanical properties, enabling applications in aerospace, construction, and medicine. However, the complex geometry of such structures poses challenges for traditional manufacturing. 3D printing offers a solution, allowing precise fabrication of these intricate designs. This study uses 3D printing to create three types of structures from PLA: concave hexagonal, four‐directional chiral, and biomimetic feather structures. Tensile testing revealed that the concave hexagonal structure outperformed the others in mechanical strength. Finite element simulations confirmed its superior load‐bearing capacity during fracture. Additionally, fractal analysis showed the concave hexagonal structure had the highest fractal dimension in crack propagation, further validating its mechanical superiority. These findings highlight the concave hexagonal structure's advantages through experimental, numerical, and fractal analyses.

Source: Fatigue & Fracture of Engineering Materials & Structures

DOI: 10.1111/ffe.14646

Authors: Shiyun Lin, Menghao Ran, Donghang Jie, Dagang Yin

Institutions: Chongqing Jiaotong University, Shandong Jiaotong University

Language: English

Topic: Cellular and Composite Structures

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: bronze

Funder: Chongqing Municipal Education Commission

Award: G3104178497