An Angle-Based Method Dealing with Vertex Vertex Contact in the Two-Dimensional Discontinuous Deformation Analysis (DDA)
Fan, H; He, S
Rock Mechanics and Rock Engineering 48(5): 2031-2043
Due to the discontinuity of the direction of a normal vector at the corner, vertex–vertex contact is indeterminate in numerical modelling. Two classes are indeterminate in two-dimensional discontinuous deformation analysis (DDA), designated as "genuine indeterminacy" and "pseudo indeterminacy". While examining these indeterminacies, it is necessary to pre-process quasi-vertex–vertex contact and determine contact or entrance edges.