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Roles of the Interphase Stiffness and Percolation on the Behavior of Solid Propellants

Article dans une revue avec comité de lecture
Author
TOULEMONDE, Paul-Ayme
492366 Airbus Safran Launchers
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
DIANI, Julie
14421 Laboratoire d'Ingénierie des Matériaux [LIM]
GILORMINI, Pierre
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
LACROIX, Geneviève
300457 SAFRAN Group
DESGARDIN, Nancy
302872 HERAKLES - SAFRAN
492366 Airbus Safran Launchers

URI
http://hdl.handle.net/10985/16018
DOI
0.1002/prep.201600062
Date
2016
Journal
Propellants, Explosives, Pyrotechnics

Abstract

Atomic force microscopy has provided access to local moduli for propellants prepared with bonding agents, which create a stiffness gradient in the matrix producing a stiffer interphase surrounding the fillers. The reinforcing impact of the bonding agent appears up to some distance and interphase percolation is observed. In order to better understand the impact of bonding agents on the stress and strain at break of propellants, finite element simulations are performed. Two-dimensional periodic cells containing randomly dispersed particles are considered, including both a cohesive zone model at the filler/matrix interface to account for possible debonding and an interphase that percolates or not. The influence of the interphase stiffness and of its percolation, on the stress and strain at break of the model propellants are evaluated through the use of a microstructure-based failure criterion.

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