Friction-induced ignition study of HTPB propellant based on a coupled chemo-mechano-thermodynamic model under ultrahigh acceleration overload conditions

To study the fatigue properties of incorporated crack HTPB (hydroxyl terminated polybutadiene propellant) propellant under strain control, fatigue tests with different strain amplitudes were carried out on the MTS fatigue testing machine. Four groups of specimens were set up in this test, namely one group with specimens and three groups with incorporated crack specimens with different angles (0°/45°/75°/ to the horizontal) of cracks. During the fatigue test, an infrared camera was used to monitor the temperature of the whole test piece in the whole process. The results show that at the same frequency, the increase of the strain amplitude will shorten the fatigue life. The fatigue life of the three incorporated crack specimens is similar reaching at 20000times, all in the same order of magnitude, and the fatigue life of the un-cracked specimen is larger reaching at 100000times, showing a cross-order phenomenon. In the fatigue test, the samples exhibit obvious strain hysteresis phenomenon and has significant viscoelastic material properties, in terms of the surface temperature monitoring of the specimens, the four groups of specimens all show a trend of temperature increase, and the final surface temperature and fatigue life are positive related.

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Rate-Dependent Tensile Properties of Aluminum-Hydroxide-Enhanced Ethylene Propylene Diene Monomer Coatings for Solid Rocket Motors

Wang,

Zhang,

Wang

et al. 2024

Materials

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Quasi-static and dynamic tensile tests on aluminum-hydroxide-enhanced ethylene propylene diene monomer (EPDM) coatings were conducted using a universal testing machine and a Split Hopkinson Tension Bar (SHTB) over a strain rate range of 10−3 to 103 s−1. This comprehensive study explored the tensile performance of enhanced EPDM coatings in solid rocket motors. The results demonstrated a significant impact of strain rate on the mechanical properties of EPDM coatings. To capture the hyperelastic and viscoelastic characteristics of EPDM coatings at large strains, the Ogden hyperelastic model was used to replace the standard elastic component to develop an enhanced Zhu–Wang–Tang (ZWT) nonlinear viscoelastic constitutive model. The model parameters were fitted using a particle swarm optimization (PSO) algorithm. The improved constitutive model’s predictions closely matched the experimental data, accurately capturing stress–strain responses and inflection points. It effectively predicts the tensile behavior of aluminum-hydroxide-enhanced EPDM coatings within a 20% strain range and a wide strain rate range.

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Friction-induced ignition study of HTPB propellant based on a coupled chemo-mechano-thermodynamic model under ultrahigh acceleration overload conditions

Cited by 3 publications

References 58 publications

Dynamic mechanical response and failure behavior of solid propellant under shock wave impact

Dynamic mechanical response and failure behavior of solid propellant under shock wave impact

Fatigue failure of incorporated crack HTPB(Hydroxyl-terminated polybutadiene) propellant under strain control

Rate-Dependent Tensile Properties of Aluminum-Hydroxide-Enhanced Ethylene Propylene Diene Monomer Coatings for Solid Rocket Motors

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