10/31/2022 0 Comments Armadillo properties![]() ![]() The tiles demonstrate two phenotypes depending on the region where they are located. ![]() These collagen fibers, also called Sharpey’s fibers, are non-mineralized and hold the tiles together they diverge from the center of the tile element (Vickaryous and Hall, 2006). Beneath the keratin layer, a well organized arrangement of bony tiles is closely compacted together and connected by collagen fibers (Fig. 1(c)). The entire top layer of the carapace is covered with a dark brown keratin layer (Fig. 1(b)). The armadillo carapace is divided into five different regions: the head, pectoral, banded, pelvic shields and tail (Fig. 1(a)). Its average length is 0.75 m (including the tail) and average weight is 6 kg. The most common one found in the US is the nine-banded armadillo, Dasypus novemcinctus (Weiss and Wislocki, 1956, Gardner et al., 2005). There are approximately twenty species of armadillo, ranging from 0.15 to 1.5 m in length. The armadillo shell and a turtle shell are compared, with their corresponding similarities and differences. This surprising result is interpreted in terms of deformation in the Sharpey’s fibers in the hydrated condition. In a specially designed punch test in which an individual tile is pushed out, the shear strength is ∼ 18 MPa, close to the tensile strength of the osteoderm. The tensile failure occurs by the stretching and rupture of the Sharpey’s fibers. In comparison, the hydrated osteoderm has a lower tensile strength of ∼ 16 MPa and a toughness of 0.5 MJ/m 3. The tough and highly mineralized tiles have a tensile strength of approximately 20 MPa and toughness of around 1.1 MJ/m 3. The tiles are connected by non-mineralized collagen fibers, called Sharpey’s fibers. Beneath the keratin layer, the osteoderm consists of hexagonal or triangular tiles having a composition that is the same as bone. The top layer of the shell is made out of a dark-brown keratin layer with bimodal size scales. Armadillo properties skin#The armadillo has a unique protective bony armor, called the osteoderm, which confers to its shell-like skin distinctive mechanical properties. ![]()
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