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Combustion mechanisms of propellants under high combustion pressure are extremely important for the development of high-pressure solid rocket motors. The combustion characteristics of three HTPB propellants prepared with an aluminum content of 1%, 10%, and 18% were evaluated in this study by analyzing the extinguished propellant surface, the combustion flame, and the temperature profile in the combustion...
The thermal decomposition processes of HAN/PVA-based propellants have been investigated using a simultaneous thermogravimetric analysis (TGA) – differential scanning calorimetry (DSC), coupled with Fourier-Transform Infrared Spectroscopy (FTIR) and Mass Spectrometry (MS) system. The activation energy (Ea), pre-exponential factor A and reaction mechanism function f(α) of the decomposition processes...
Q235 steel is widely used in engineering and construction. Therefore, it is important to identify the damage mechanism and the acoustic emission (AE) response of the material to ensure the safety of structures. In this study, an AE monitor system and an in situ tensile test with an optical microscope were used to investigate the AE response and insight into the damage process of Q235 steel. The surface...
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