VIBRATION ANALYSIS ON SANDWICH STRUCTURE WITH AUXETIC CORE FOR IN- PLANE CONFIGURATION

• Main Author: Marcelina, Mela
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61940
• Institution: Institut Teknologi Bandung

Begins as a development for aircraft structure, sandwich composite structures are increasingly used for various applications in other vehicle structures because they have specific stiffness and strength, as well as high energy absorption capabilities. The development of sandwich structures is widely carried out in the core, one of which is the use of auxetic materials. With the characteristics of negative poisson's ratio, auxetic structures could provide an advantage in aspects of stiffness and high energy absorbing ability. To support the practical implementation of auxetic materials, various studies are needed to determine the properties and responses of auxetic structures in various loading conditions. One of them is characteristic in the form of a response to vibrations. In this research, will be conducted a study of the characteristic structure of sandwiches with auxetic core in the case of vibration by conducting numerical simulations using ABAQUS / CAE software. The simulation is done by modeling the face sheet as a solid element and the core as a shell element, with constraints in the form of shell-to-solid coupling, as well as fixed limit conditions at the left end. Modeling is done by varying several parameters of re-entrant cells, including: angular values ?, h/l, and t/l. Analysis showed that the natural frequencies closest to solid structures were obtained at an angle of ? = -50, h/l ? 0,95, and t/l ? 0,166 with the average difference of 5%. With significant reduction in mass of 53,5%.