A COMPREHENSIVE REVIEW OF THE RECENTDEVELOPMENTS IN THE MECHANICS OF SANDWICH PANELS WITH AUXETIC METAMATERIAL CORES

Abstract

Although the mechanical accuracy of auxetic  materials is unique because they expand transversely when stretched instead of contracting as in conventional materials, which gives them improved mechanical properties such as impact resistance, high energy absorption, and improved crack resistance, there are several major challenges that can be used in advanced engineering applications, including (not fully dealing with the mechanical properties of these materials under different loading conditions, such as estimation, bending, and fatigue, the need to improve the design of these cores in terms of microstructure and improve accuracy and mechanical response, determining the best ways to issue these high versions at the lowest cost from the publications and finding new applications for these different industrial materials, such as aviation, automotive, and protection). To solve these problems (analyzing and improving the geometric designs of auxetic cores within sandwich structures, such as hybrid or graded cores, comparing the mechanical properties of these structures using numerical and experimental analysis techniques, studying the effect of using 3D printing as a primary manufacturing method for these materials, which enables the possibility of designing complex structures with improved mechanical performance, discussing the different applications of these materials and highlighting the areas that can benefit from their unique properties, such as their application in armor Bulletproof or blast-resistant panels. The novelty of this study is to provide a comprehensive review that combines the design of auxetic cores, modern manufacturing methods, advanced analysis of mechanical properties, and practical applications.