Ice Issues, Porosity and Snow Experiments for Dynamic NEO and Comet Modeling

Statistics – Computation

Scientific paper

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Porous Materials, Comets, Ice, Snow, Silicates, Dynamic Characteristics, Impurities, Porosity

Scientific paper

Category 0 NEO bodies, such as many comets, appear to be comprised largely of porous ice. Quasi-static and dynamic properties of ice are expected to control the corresponding properties of Category 0 NEO material. These properties depend on temperature, strain rate, and possibly sample history. Corrections must be made of porosity and the presence of impurities such as silicates. These corrections reflect the added complexity of energy partitioning in a porous, inhomogeneous material as well as added P x Delta V work during compression. A study of the dynamic (shock) properties of natural snow over the stress range 0-4 GPa is described. Comparison of the results of this study with computational modeling suggests that existing ice models with introduced porosity are applicable in some regimes, while water models with introduced porosity provide better fidelity in other regimes.

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