Investigation of the mechanical performance of the sandwich cylindrical shell with a truss core under eccentric loading

Sandwich structures, a class of composites, leverage the connection of diverse materials to achieve superior mechanical properties, such as elevated stiffness, a favorable strength-to-weight ratio, impressive energy absorption capability, and effective thermal insulation. This study delves into the mechanical response of a cylindrical sandwich shell with a truss core when subjected to eccentric compression loading through simulation. The investigation encompasses an analysis of failure modes, ultimate load-bearing capacities, and specimen deformations. A comprehensive examination is undertaken to elucidate the impacts of adhesive stiffness and eccentricity load on critical failure loads. Consistency is observed in comparisons between finite element simulation outcomes across distinct buckling modes and analytical critical values. Noteworthy influences on buckling modes are identified, including element shape and mesh size. Local buckling emerges as the predominant failure mode, attributed to a high diameter-to-thickness ratio (D/t). The study underscores the significant enhancement in buckling load achieved through a robust adhesive bond. Moreover, the discernible effects of load eccentricity on the ultimate load-bearing capacity of cylindrical sandwich shells are highlighted, providing valuable insights for manufacturing engineers seeking to optimize structural performance in related applications. Also, by considering the type of meshing and its effects on the critical load, which was rarely considered in previous studies, this research enables achieving a more accurate modeling of the sandwich structure and analyzing the results as best as possible in this field. In conclusion, this work not only contributes to the current understanding of mechanical responses in sandwich structures but also sets the stage for future developments in this evolving field.