3D-printed bioinspired spicules: Strengthening and toughening via stereolithography

Tavangarian，Fariborz1,2; Sadeghzade，Sorour1,3; Fani，Niloofar1; Khezrimotlagh，Dariush4; Davami，Keivan5

2024-07-01

10.1016/j.jmbbm.2024.106555

Journal of the Mechanical Behavior of Biomedical Materials   影响因子和分区

1751-6161

1878-0180

Recently, the replication of biological microstructures has garnered significant attention due to their superior flexural strength and toughness, coupled with lightweight structures. Among the most intriguing biological microstructures renowned for their flexural strength are those found in the Euplectella Aspergillum (EA) marine sponges. The remarkable strength of this sponge is attributed to its complex microstructure, which consists of concentric cylindrical layers known as spicules with organic interlayers. These features effectively impede large crack propagation, imparting extraordinary mechanical properties. However, there have been limited studies aimed at mimicking the spicule microstructure. In this study, structures inspired by spicules were designed and fabricated using the stereolithography (SLA) 3D printing technique. The mechanical properties of concentric cylindrical structures (CCSs) inspired by the spicule microstructure were evaluated, considering factors such as the wall thickness of the cylinders, the number of layers, and core diameter, all of which significantly affect the mechanical response. These results were compared with those obtained from solid rods used as solid samples. The findings indicated that CCSs with five layers or fewer exhibited a flexural strength close to or higher than that of solid rods. Particularly, samples with 4 and 5 cylindrical layers displayed architecture similar to natural spicules. Moreover, in all CCSs, the absorbed energy was at least 3–4 times higher than solid rods. Conversely, CCSs with a cylinder wall thickness of 0.65 mm exhibited a more brittle behavior under the 3-point bending test than those with 0.35 mm and 0.5 mm wall thicknesses. CCSs demonstrated greater resistance to failure, displaying different crack propagation patterns and shear stress distributions under the bending test compared to solid rods. These results underscore that replicating the structure of spicules and producing structures with concentric cylindrical layers can transform a brittle structure into a more flexible one, particularly in load-bearing applications.

Biomimetic structures Euplectella aspergillum sponge Lightweight materials Rigid resin Spicule-inspired structure Stereolithography

SCI ; EI

英语

其他

20241615946998

Bending strength ; Biomimetics ; Brittle fracture ; Crack propagation ; Cylinders (shapes) ; Shear stress ; Stereolithography

Biotechnology:461.8 ; Biology:461.9 ; Heat Treatment Processes:537.1 ; Laser Applications:744.9 ; Manufacturing:913.4 ; Materials Science:951

2-s2.0-85190609700

Scopus

1.Mechanical Engineering Program,School of Science,Engineering and Technology,Middletown,Penn State Harrisburg,17057,United States
2.Department of Biomedical Engineering,Pennsylvania State University,State College,University Park,16802,United States
3.Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing,Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Mathematical Sciences Program,School of Science,Engineering and Technology,Middletown,Penn State Harrisburg,17057,United States
5.Department of Mechanical Engineering,University of Alabama,Tuscaloosa,35487,United States

Tavangarian，Fariborz,Sadeghzade，Sorour,Fani，Niloofar,et al. 3D-printed bioinspired spicules: Strengthening and toughening via stereolithography[J]. Journal of the Mechanical Behavior of Biomedical Materials,2024,155.

Tavangarian，Fariborz,Sadeghzade，Sorour,Fani，Niloofar,Khezrimotlagh，Dariush,&Davami，Keivan.(2024).3D-printed bioinspired spicules: Strengthening and toughening via stereolithography.Journal of the Mechanical Behavior of Biomedical Materials,155.

Tavangarian，Fariborz,et al."3D-printed bioinspired spicules: Strengthening and toughening via stereolithography".Journal of the Mechanical Behavior of Biomedical Materials 155(2024).