pps proceeding - Abstract Preview
pps proceeding
Symposium: Modeling & Simulation
Poster Presentation
 
 

Processing of Multilayer Propellants Through Concentric Extrusion Dies

Durand Simon (1), Dubois Charles (2)*, Lafleur Pierre G. (2)

(1) GD-OTS Canada - Valleyfield - Canada, (2) École Polytechnique Montreal - Montreal - Canada

The primary purpose of this effort is to establish the criteria that enable the extrusion of in concentric cylindrical dies. The use of segregated propellants formulations with results in a more progressive pressure-time curve during the propellants combustion, improved ballistic performances. In a first step, the materials and the range of multilayer propellant sticks was determined from closed vessel combustion data and For a given set of layer composition, the optimal geometry of the propellant sticks acceleration for the maximal weapon system internal pressure capacity. Secondly, the flow properties of selected polymer based propellants formulations were measurements by using both rotational and capillary rheometers. This characterization behaviours that needed to be accounted for during the die design. More specifically, we enables the maximum variation of the power law flow index “n” while keeping the flow challenge originated from the unconnected flow between the inner and outer sections A finite element modeling and simulation approach based on the COMOSL MultiPhysics code was retained for the die design process. The results obtained by finite elements experimentally. The study considered die design iterations where angles and channel optimize and regulate each propellant layer flow rates. Results emphasize the relevance the shear thinning behavior of this type of polymer based propellant in the design process of the extrusion dies.