Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
STRUCTURAL PERFORMANCE ANALYSIS OF A THREAD IN AN ACADEMIC ROCKET MOTOR
Submission Author:
Alexandre Mateus Mendonça Bezerra , RN , Brazil
Co-Authors:
Airton Felipe Soares Fernandes, Alexandre Mateus Mendonça Bezerra, Leonardo Camara Queiroz, Evans Ferreira, João Carlos Arantes Costa Júnior
Presenter: Airton Felipe Soares Fernandes
doi://10.26678/ABCM.COBEM2021.COB2021-2048
Abstract
Considering the great importance of operating a rocket engine, the engine design must be very well thought out. It will be responsible for all the propulsion of the set, lifting it in the air. Calculations related to structural safety are parameters that must be performed with caution, considering above all a safety factor that promotes its guarantee. The main objective of this work is to structurally analyze a screw profile chosen for an academic internal combustion rocket engine with a solid propellant. The chosen profile is trapezoidal with coarse settings. The engine is designed as a thin-walled pressure vessel, internal pressure of 4 Mpa, solid fuel composed of potassium nitrate and sucrose, maximum thrust of 1491 N, thrust of 1998 Ns and 1,474 s of burn, validated for 1500 missions feet tall. The structural analysis was carried out, considering the action of pressure on the thread, by the von Mises criterion, evaluated through simulation with the finite element method. In addition, a thread fatigue analysis was performed. The analytical results were consistent with the numerical ones, corroborating the veracity of the equations used in the model. As expected through the analysis, it was possible to identify that the components presented maximum stresses below the yield and final strength. The analysis also proved that the strengths above the thread are structurally safe, resulting in a safety factor greater than 2. In addition, the fatigue analysis proved to be safe. It was possible to verify that an academic rocket engine, using trapezoidal threads, does not present structural problems.
Keywords
structural analysis, thick trapezoidal thread, Solid Rocket Motor, Simulation
