Shock-Crash-Fire Porous Refractories
Shock-Crash-Fire Porous Refractories for Impact Limiters and Thermal Barriers
Tech Area / Field
3 Approved without Funding
Joint Institute for High Temperatures RAS, Russia, Moscow
- VNIIEF, Russia, N. Novgorod reg., Sarov\nState University of Nizhny Novgorod / Research Intitute of Mechanics, Russia, N. Novgorod reg., N. Novgorod
- Sandia National Laboratories, USA, NM, Albuquerque\nUniversity of Texas at Austin / Institute of Advanced Technology, USA, TX, Austin\nLos Alamos National Laboratory, USA, NM, Los-Alamos
Project summaryDesigning of different critical shielded structures, for example, transportable supercontainers to deliver cargoes containing explosive and nuclear-active materials or traps to retain reactor core melts in the event of a nuclear power plant accident, provides for the development and use in such structures of special materials with enhanced deformation resistance and improved thermophysical properties. As applied to such structures it might be promising to use, for example, highly porous refractory ceramics based on oxides of zirconium (%wt., 94ZrO26CaO), aluminum (aluminosilicates: alumina 28Al2O372SiO2 and high alumina 62Al2O338SiO2 ceramics) and depleted uranium.
Operation of such structures implies the possibility of accidents which can be accompanied by strong impacts. Strength calculations of such structures require a large database of thermophysical and physical-mechanical properties of the said damping materials and their response to possible shock-wave loading to be used as early as at the stage of their designing. The objective of the Project is to look at the mechanical and thermophysical properties of porous refractories (having a porosity of 15-20 and 50-60 percent) based on the said oxides and to choose the most promising mechanical load dampers and heat barriers. Physical-mechanical properties of heat-resistant damping materials will be examined in a wide range of strain rates (10-4-106s-1) and strain amplitudes (up to several GPa). For this purpose, different testing techniques will be used, such as quasi-static testing by means of universal machines with a servohydraulic drive; impact testing; dynamic tension, compression and shear testing using the Kolsky method and its modifications; plane-wave testing by means of gas guns and shock wave measurements using a manganin pressure sensor and a capacitive transducer. Thermophysical properties will be studied experimentally and estimated theoretically at temperatures up to 3,000 K. Dampers will be chosen based on the outcome of internal explosive testing of a steel cylindrical part of a container having 422 mm in diameter and 1,000 mm in length with and without damping layer of the most efficient refractory.
Data obtained will be useful in designing storage and transportation containers for hazardous cargoes, such as explosive and radioactive materials, and nuclear reactor melt traps.
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