Hole-pin joining structure with fiber-round-hole distribution of lobster cuticle and biomimetic study
Abbreviated Journal Title
J. Mech. Behav. Biomed. Mater.
Boston spiny lobster cuticle; Hole-pin joining structure; Fiber-round-hole distribution; Maximum pullout force; Biomimetic; fabrication; COMPOSITE STRUCTURES; HOMARUS-AMERICANUS; EXOSKELETON; MICROSTRUCTURE; FOREWINGS; FRACTURE; BEETLES; EXAMPLE; Engineering, Biomedical; Materials Science, Biomaterials
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. (C) 2014 Elsevier Ltd. All rights reserved.
Journal of the Mechanical Behavior of Biomedical Materials
"Hole-pin joining structure with fiber-round-hole distribution of lobster cuticle and biomimetic study" (2014). Faculty Bibliography 2010s. 5159.