Compressive mechanical properties of HTPB propellant at low temperatures and high strain rates

• DOI: 10.1016/j.rinp.2017.10.034
• Publication Date: 2017-10-23T17:02:52Z
• Authors: Xiangdong Chen; Jianwei Lai; Xin-long Chang; Youhong Zhang; Lei Zhang; Chao Wang
• Keywords: Split Hopkinson Pressure Bar; Tearing

To study the compressive mechanical properties of hydroxyl-terminated polybutadiene (HTPB) propellant at high strain rates (700–1900/s) and low temperatures (−50 °C to 25 °C), we conducted a dynamic experiment using cylindrical specimens on split Hopkinson pressure bar (SHPB). In addition, scanning electron microscopy was employed observe fracture surfaces. The experimental results indicate effectiveness proposed SHPB testing for HTPB propellant. effects rate temperature remarkably influenced variations in stress. lower higher generated an obvious increase modulus strength. Even −50 1900/s, still maintained its viscoelastic characteristics. On basis time–temperature equivalence principle, obtained master curves parameters. mainly exhibited transgranular damage, increased porosity, matrix tearing after impact.