Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL SIMULATION OF TNT CASTING IN A SHAPED CHARGE SHELL
Submission Author:
Bruna Loiola , RJ , Brazil
Co-Authors:
Bruna Loiola, Çiğdem Susantez, ALDELIO BUENO CALDEIRA
Presenter: Bruna Loiola
doi://10.26678/ABCM.ENCIT2020.CIT20-0050
Abstract
The present work is devoted to numerical simulation of TNT casting in a shaped charge shell. This kind of device is relevant in military and civilian applications, being used in anti-tank ammunitions and warheads and in petroleum industry for perforating well liners. TNT casting is one of the steps to manufacture the high explosive shaped charge and depending on the cooling conditions, during TNT solidification, defects can be formed. These defects can be cracks, voids and gaps, reducing the device efficiency and increasing the risk of accidental detonation. Then, the heat transfer process during TNT cooling and solidification inside an axis-symmetrical cavity is studied. The apparent heat capacity method is employed on a transient-diffusive heat transfer equation to model the phase change. The shaped charge has a conical void and three different height values of this void cone are analyzed. The boundary conditions are the prescribed temperature on the conical surface and natural convection on others surfaces. The numerical simulations were performed by using COMSOL Multiphysics and Modeling Software, which is based on the finite-element method. The results have shown that the cone geometry have considerable influence in the time of the solidification process and in thermal stress intensity. This influence must be taking into account, during shaped charge and manufacture process designs.
Keywords
shaped charge, Solidification, apparent heat capacity, explosive, ammunition
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