Para obtener la variación precisa de las propiedades mecánicas ante envejecimiento de un propulsante base HTPB, en el documento de la referencia se lo sometió a un envejecimiento térmico acelerado, llevándose a cabo ensayos de tracción uniaxial para obtener datos mecánicos de aquel, así como el límite elástico y la tensión de fractura, usando propulsantes HTPB envejecidos a diferentes tiempos y temperaturas.
To get accurate aging mechanical properties of aged HTPB propellant, the thermal accelerated aging experiment method is utilized and the uniaxial tensile experiments were conducted to obtain the mechanical data of aged HTPB propellants, and the maximum tensile strength, σm, maximum tensile strain, εm, and the fracture tensile strain, εb, of HTPB propellant with different aging time and various aging temperatures,were obtained, using universal material testing machine. The experimental results show that the σm of HTPB propellant initially increases, subsequently decreases and finally increases with aging time. The εm and εb generally decrease with increasing aging time, what’s more, the decrease rate of both εm and εb reduce with the aging time. What’s more, the postcure effect and oxidation reaction occurred inside HTPB matrix, including the chain degradation reaction and oxidation-induced cros.
