Visco-mechanical characterization of Molluscs (sea shell) biomimetics designs structures

The study of biomimetics lattice structures, which frequently exhibit outstanding mechanical capabilities, is one of the hottest fields in modern new material/structural technology. The goal of this study is to analyze the nature optimize design of the Molluscs (Sea Shell) porous structure and bio-mimic the sea shell structure design for crashworthiness based on the structure's energy absorption nature and pore distribution. Initially, a micro-CT investigation was conducted to better understand the internal design structure and distribution of pores in the Costapex gastropod mollusks sea shell. Based on the examination of internal design structure and pattern, three different biomimetics designs, such as (a) shell with solid betel shape (SBS) structure, (b) shell with hollow betel shape (HBS) structure, (c) shell with concentrated hollow betel shape (CHBS) structure, were modeled on Abaqus simulia software and fabricated by additive manufacturing by utilizing ABS-M30i material. The computational and experiments compressive analysis at 0.5%, 1%, and 10% strain rate were conducted to study its mechanical properties, while digital image correlation (DIC) was performed simultaneously to study the strain field of the design structures. Furthermore, the dynamic mechanical analysis (DMA) was performed at 0.5% strain rate at different frequency to study the viscoelasticity nature of the design structure and the various outcomes of the simulation, experimental, DIC, and DMA analysis are summarizing in results section. (author)