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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.1030
pages 1006-1017

DEGRADATION OF A THERMAL INSULATOR UNDER VIBRATION AND ACCELERATION

Amina Eythrib
ONERA, Chatillon, France
Franck Cauty
ONERA
retired
Luciano Galfetti
Politecnico di Milano

ABSTRACT

The design of the thermal insulators used in solid rocket propulsion is a key factor in the rocket design; in particular, the characterization of these materials is of strategic importance for future improvements in solid rocket propulsion. Following the experimental evidence showing that internal insulation erosion is higher in flight than in static firings, this paper aims at a preliminary approach of flight condition effects on the char behavior of a silica filled ethylene propylene diene monomer (EPDM) insulator. An experimental set up has been developed to investigate the effects of external mechanical loads, due to accelerations and vibrations, typically induced by flight conditions. Low frequency vibration effects indicate that the vibration modifies the char ejection mode, by breaking the char layers, thus increasing the degradation rate. This behavior is a crucial factor in determining the thermal protection system size.


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