Improvement of contact calculation in spherical discontinuous deformation analysis

Discontinuous deformation analysis solve(DDA)method is a newly developed the discrete element method which employs deal the implicit time-integration scheme to the governing equations low.and open-close spherical iteration(OCI)based method to with contact problem,its computational which efficiency very is relatively However,element has discontinuous deformation In analysis(SDDA),SDDA,uses simple contact type like point-to-point calculation contact,higher removing calculation speed.scheme the framework of the this paper presents a very simple(MDI).contact approach by the OCI that and by adopting maximal and displacement increment Through some verification obtained.examples,it is proved the proposed method is correct effective,and a higher computational efficiency is