Localized Impulsive Response of Aluminum Three-Layered Sandwich Cylinders with Auxetic Core

Auxetic materials and structures are increasingly developed in advanced industries such as aerospace and aviation. Due to their negative Poissons’s ratio, they show interesting static and dynamic behaviors. In this paper, an auxetic structure is used in the core of a thin sandwich cylindrical shell. The effect of geometric parameters of the unit cell of the cellular auxetic core structure is modeled according to the existing relation for the equivalent mechanical properties. Based on the classical shell theory, transient dynamic response of the shell under localized impulse load is investigated using mode superposition method. Verification of the result is done by making comparison with ABAQUS simulation result and good agreement is observed. Then, parametric study is achieved by studying the influence of the geometric parameters of the unit cell on the transient deformation of the shell. Results show that the corner angle and dimensional aspect ratio of the unit cell govern the maximum deflection of the shell under a specified loading.

کلیدواژه ها:

Auxetic Core ، Unit Cell Geometry ، Impulsive Load ، Local Deformation