T - IfB
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CD: more contact lawsrolling friction:Add additional contact torque. more unknowns(1 in 2d, 3 in 3d) more constraints−μr,eff( + )F NF CT locμr,eff( + )F NF Cω rcohesion:Add to Signorini conditionan attractive force within a range.Many variations of contact laws are possible.71CD: more contact lawsCollapsing soil/granular structure:Gravity leads tocollapse, cohesiveforce stabilizesstructures.Two extremes:• very fast deposition• very slow depositon72
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