Aging Properties of An HTPB Propellant

摘要

The mechanical properties of an HTPB propellant are observed during the aging process of this material including different conditions of temperature and humidity. The report concerns the results of initial time and after an aging duration of 6 months under conditions of +50 degrees C and +20 degrees C for relative humidity of Hr76% Hr33% and in dry air. The mechanical properties observed are more precisely the crack propagation capability of the material but for modelisation and numerical calculation purposes, the material is also tested in uniaxial tension at different strain rates, in simple shear for one strain rate and in the volumetric characterization test (uniaxial tension in the Ferris gaz dilatometer) for different strain rates. To allow a complete viscoelastic description, the material is also tested in the uniaxial tension relaxation test for different imposed elongations. The program scope is to perform a crack propagation numerical simulation in the Air Force Research Laboratory using the high performance numerical tools available there for an SNPE formulated material.