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This report presents new EOS and strength models for use in numericalhydrocode simulations of dust impacts on the NASA solar probe space vehicle.This spacecraft will be subjected to impact at velocities up to 300 km/s,producing pressures as high as 100 TPa and temperatures as high as 200 eV.Hence the material models must treat a variety of physical and chemicalphenomena, including solid-solid transitions, melting and vaporization,chemical reactions, electronic excitation and ionization. The EOSPro code isused to develop tabular EOS that include these effects. The report discussesthe theoretical methods used to create the new EOS tables and constitutivemodels for six materials--Al2O3, two porous carbon materials, fused SiO2, asilicone elastomer, and germanium--which will be used in the thermal protectionshield (TPS) and solar cells, the components most vulnerable to dust impacts.It also presents the results of hydrocode simulations of dust impacts on theTPS and on glass targets. It discusses the importance of radiationcontributions to the EOS and the importance of reactions between Al2O3 andcarbon during impacts. It makes recommendations for additional work, includingexperiments for testing the accuracy and reliability of the hydrocodesimulations as well as for improving and calibrating the material models.

Equation of State and Constitutive Models for Numerical Simulations of Dust Impacts on the Solar Probe