The development of an innovative drilling system makes it necessary to model the material of extra-terrestrial soil , i.e.regolith or lunar soil.And then the drilling process is numerically simulated.Since real regolith is very scarce and costly , sand properties are investigated by means of experiments and sand model is constructed with the capability of partly reflecting these properties.With the use of smooth particle hydrodynamics ( SPH ) method in LS-DYNA , data analysis and modeling process are presented to reach the following achievements :( 1 ) Develop ageneral model approach of sand using SPH method ;( 2 ) Compare SPH results with experimental data to validate it ;( 3 ) Adapt the sand model to lunar soil while fitting the simulation of dual-reciprocating drilling ( DRD ) process.
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