Discrete Element Method Simulations of Digging in JSC-1a

Laboratory testing of equipment for lunar or Martian use is difficult due to the inability to accurately replicate the conditions in these environments (e.g. gravity). While it is important to do laboratory testing at times, modeling provides a low cost way to complete many tests in a repeatable soil bed. This work describes the development of a three dimensional discrete element method (DEM) simulation of a scoop (Surveyor Soil Mechanics Surface Sampler replica) in JSC-1a. The JSC-1a simulant is modeled using non-convex polyhedral grains. Both static and percussive digging tests are completed. Results of the DEM digging tests are compared with results of DEM scoop experiments and simulations reported by Lee et al. (2010).