Stress Analysis of Thick-Walled Cylinder for Rocket Motor Case under Internal Pressure

Lasinta Ari Nendra Wibawa; Kuncoro Diharjo; Wijang Wisnu Raharjo; Bagus H. Jihad

Authors

Lasinta Ari Nendra Wibawa Department of Mechanical Engineering, Faculty of Engineering, Universitas Sebelas Maret, Indonesia
Kuncoro Diharjo Department of Mechanical Engineering, Faculty of Engineering, Universitas Sebelas Maret, Indonesia
Wijang Wisnu Raharjo Department of Mechanical Engineering, Faculty of Engineering, Universitas Sebelas Maret, Indonesia
Bagus H. Jihad National Institute of Aeronautics and Space (LAPAN), Indonesia

Keywords:

Finite element method, pressure vessel, rocket motor case, stress analysis, thick-walled cylinder

Abstract

This paper investigated the stresses developed in a thick-walled cylinder for rocket motor case under internal pressure. Stress analysis used the finite element method with ANSYS software for rocket motor case selection. The simulation used thick-walled cylinders with wall thickness 6, 7, 8, 9, and 10 mm having 300 mm long and outer diameter of 122 mm. It used an internal pressure of 2, 4, 6, 8, and 10 MPa. The material variation in this research used Aluminium 6061, CFRP, and GFRP. Comparing the hoop and longitudinal stress values between analytics and simulations were for the validation process. The simulation results show that the thicker the cylinder wall, the von Mises stress decreases. Aluminium 6061 and CFRP have a safety factor greater than 1 for all wall thickness and internal pressure variations. GFRP has a safety factor greater than 1 for all internal pressure variations when the wall thickness of 10 mm