Title

Hole-Pin Joining Structure With Fiber-Round-Hole Distribution Of Lobster Cuticle And Biomimetic Study

Keywords

Biomimetic fabrication; Boston spiny lobster cuticle; Fiber-round-hole distribution; Hole-pin joining structure; Maximum pullout force

Abstract

Observations of the cuticle of the Boston Spiny Lobster using scanning electron microscope (SEM) show that it is a natural biocomposite consisting of chitin fibers and sclerotic-protein matrix with hierarchical and helicoidal structure. The SEM images also indicate that there is a hole-pin joining structure in the cuticle. In this joining structure, the chitin fibers in the neighborhood of the joining holes continuously round the holes to form a fiber-round-hole distribution. The maximum pullout force of the fibers in the fiber-round-hole distribution, which is closely related to the fracture toughness of the cuticle, is investigated and compared with that of the fibers in non-fiber-round-hole distribution based on their representative models. It is revealed that the maximum pullout force of the fibers in the fiber-round-hole distribution is significantly larger than that of the fibers in the non-fiber-round-hole distribution, and that a larger diameter of the hole results in a larger difference in the maximum pullout forces of the fibers between the two kinds of the fiber distributions. Inspired by the fiber-round-hole distribution found in the cuticle, composite specimens with the fiber-round-hole distribution were fabricated with a special mold and process to mirror the fiber-round-hole distribution. The fracture toughness of the biomimetic composite specimens is tested and compared with that of the conventional composite specimens with the non-fiber-round-hole distribution. It is demonstrated that the fracture toughness of the biomimetic composite specimens with the fiber-round-hole distribution is significantly larger than that of the conventional composite specimens with the non-fiber-round-hole distribution.

Publication Date

12-1-2014

Publication Title

Journal of the Mechanical Behavior of Biomedical Materials

Volume

40

Number of Pages

161-167

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.jmbbm.2014.09.001

Socpus ID

84907567259 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84907567259

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