بررسی ارتعاشات آزاد ساندویچ پنل‌های کامپوزیتی قابل بازیافت با ساختارهای متفاوت لایه میانی

This article analyzes the vibrations of recyclable composite sandwich panels. The aim of this research is to investigate the vibration modes and natural frequencies of these structures using numerical analysis. The structural faces are made of composite material with glass fibers and polyamide resin, and the core is made of polyamide, a thermoplastic polymer that is recyclable and reusable. The results of this study can help improve the design and industrial applications of these structures in various fields such as aerospace, automotive, speedboats, and more. The vibration analysis of these sandwich panels is crucial as it leads to improved stability and dynamic performance. The results of this research show that in structures with a honeycomb core, increasing the cell wall thickness increases the natural frequency. The average natural frequencies in the honeycomb structure are 6% higher than in the sinusoidal auxetic structure. Sinusoidal auxetic structures have a higher weight and lower average natural frequency compared to the honeycomb structure. The results indicate that increasing the cell wall thickness increases the natural frequency of the structure. For example, the natural frequency of the first mode in a structure with a honeycomb core and a wall thickness of 1.5 mm is approximately 952.36 Hz, while for a structure with a wall thickness of 2.5 mm, this value increases to 970.91 Hz. These changes highlight the significant impact of wall thickness and core structure type on the dynamic behavior of sandwich panels.