Transient Thermal Response of a Projectile Misfired in a Mortar Tube; Technical rept

摘要

Valuable insight into the response of various projectile features under misfire conditions can be drawn from an accurate finite element analysis. This is important since it can model the response and performance of safety critical features including vent plugs and propellant cook-off times. This paper describes the approach used to model the transient thermal analysis of a misfired Precision Guided Mortar Munition (PGMM) in a mortar tube. The analysis of the PGMM described here can be applied to a wide range of projectiles, from large caliber artillery to small caliber bullets with similar environmental conditions. In developing the model, projectile and gun tube components are assigned temperature states representative of misfire. Hand calculations are then performed to determine the dominant heat transfer mode. Las fly, critical parameters are used to setup a finite element model in ABAQUS/CAE for an uncoupled heat transfer analysis.