Nanoindentation investigation of the stress exponent for the creep of dung beetle (Copris ochusMotschulsky) cuticle

Abstract

ABSTACTWith the rapid development of bionic science, especially the progress that has been made in the fields of biomaterials and biomimetics, there is now great interest in the surface and internal mechanical properties of biological materials at the micro-and nanoscale. The study of micro-and nanoscale biomaterial mechanical properties could enable interdisciplinary applications in materials science, biological science and bionic science. Dung beetle (Copris ochus Motschulsky) cuticle is a viscoelastic material that is both viscous and flexible via elastic deformation under external forces; where stress s, strain e and elastic modulus E are related in the following way: s D Ee. In addition, as s is related to the rate of strain, time is also a factor. The stress-strain relationships of various parts of dung beetle cuticle were investigated in this paper. As time increased, the stress and strain of the material were found to decrease and increase, respectively, indicating that when the material was indented for a certain period, the interaction force between the indenter and the material gradually achieved a state of dynamic equilibrium. However, strain continued to occur until reaching a point of equilibrium because of the creep phenomenon. The stress-strain curves showed a strong character in each holding time condition: the longer the holding time, the more flattened the stress-strain curve. These findings will be useful in the advanced design of strong, lightweight, and biomimetic composites.

Analysis of Mechanical Properties and Mechanical Anisotropy in Canine Bone Tissues of Various Ages

“…However, it is not well known whether the mechanism is closely related to the age-related changes in the mechanical behavior of the bone itself. In addition, the existing models always focus on the single longitudinal properties and neglect the bone anisotropy which is not conducive to the analysis of the effect of microstructural changes on the overall mechanical properties of bone [1, 7, 8]. Therefore, fully understanding the effect of age on the mechanical behavior of bone and bone microstructure anisotropy is of great importance to explore multiscale constitutive micromechanics models.…”

Nanoindentation Properties and Finite Element Analysis of the Rostrum of Cyrtotrachelus buqueti Guer (Coleoptera: Curculionidae)

“…Investigation of the geometrical characteristics and structure of the superior soil-burrowing claws and toes of the mole inspired the design of the biomimetic stubble-cutting disc with its excellent structural strength and cutting efficiency (Li et al, 2013). The relationship between the dual helicoidal fiber arrangement of the beetle's cuticle and its high fracture toughness and strength has offered useful information for the design of advanced composites (Zhang et al, 2016).…”