Residual temperature measurements of light flash under hypervelocity impact

• Published in: International journal of impact engineering Vol. 35; no. 11; pp. 1368 - 1373
• Main Authors: Tsembelis, K., Burchell, M.J., Cole, M.J., Margaritis, N.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.11.2008; Elsevier Science
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Fluid dynamics; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); General theory; Glass; High-pressure and shock-wave effects in solids and liquids; Hypervelocity impact; Light flash; Mechanical and acoustical properties of condensed matter; Physics; Residual temperature; Solid mechanics; Structural and continuum mechanics; Light flash; Hypervelocity impact; Residual temperature; Glass; Phase transformations; Phase change; Grueneisen constant; Phonons; Hydrodynamics; Residual temperature: Glass; Iron; Experimental study; Soda-lime glasses; Temperature measurement; Equations of state; High speed; Modelling; Mechanical shock
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2007.09.004

Experimental and theoretical results for light flash temperatures are presented for impacts on soda-lime glass by iron projectiles. The experiments were performed with a 2 MV Van de Graaff, where iron dust particles (0.14–0.63 μm in diameter) impacted soda-lime glass at a velocity range of 5–20 km s −1. Theoretical calculations were based on the assumption of the Mie–Gruneisen equation of state (EoS) with different values for the Gruneisen coefficient and hydrodynamic behaviour (no strength effects were considered). Within the scatter of experimental data, results suggest a constant value for the average light flash temperature of approximately 2600 K independent of iron dust impact velocity. Although theoretical calculations are limited by the use of the Mie–Gruneisen EoS up to the point of incipient vaporisation of the target material, relatively good agreement with experiments is observed. This agreement suggests that the observed constant temperature may be due to material phase change from incipient to complete vaporisation over the range of velocities considered.