Thermal Buckling and Thermal Induced Free Vibration Analysis of Perforated Composite Plates: A Mathematical Model

Document Type: Research Paper

Authors

1 Department of Materials and Manufacturing Processes, Malek Ashtar University of Technology, Lavizan, Tehran, Iran

2 University Complex of Materials and Manufacturing Technology, Malek-e- Ashtar University of Technology, Lavizan, Tehran., Iran

3 Composite Research Centre, Malek-e-Ashtar University of Technology, Lavizan, Tehran, Iran

4 Department of Mechanical Engineering, MalekAshtar University of Technology, Tehran, Iran

5 University Complex of Materials and Manufacturing Technology, Malek Ashtar University of Technology, Lavizan, Tehran, Iran

Abstract

This paper is concerned with thermal buckling and thermal induced free vibration analyses of PCPs (perforated composite plates) with simply supported edges using a mathematical model. The stiffness and density of PCP is defined locally using Heaviside distribution functions. The governing equations are derived based on CLPT. The present solution gives reasonable results in comparison with the few literatures. To investigate the structural behaviour of PCPs subjected to initial thermal loads, many parametric studies have been carried out. Results showed that the presence of perforations has significant effect on thermal buckling and thermal induced fundamental frequency.According to results, By increasing the E2/E1 and α2/α1 ratios, the critical temperature difference of orthotropic perforated plate is decreased. Using the same material properties, the PCP (R=50%) is 4 times more resistant for thermal buckling than the monolithic composite plate of the same weight. By increasing the E2/E1 ratio, the thermal induced fundamental frequency of the orthotropic perforated plate demonstrate ascending and •By increasing the E2/E1 ratio, the thermal induced fundamental frequency of the orthotropic perforated plate demonstrate ascending and descending behaviour before and after a specific intersection point.

Keywords