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scratch simulation contact loss

Abaqus Users mailing list
GreetingsI want to simulate scratch in ABAQUS I define it in three steps: indenting (load control), displacement (maintaining the load from the first step), and the unloading. however, when my model goes to the second step which is scratching, my contact broke off and the rigid analytical body goes up (figure 1), also for the third step the rigid body comes back to its origin. I would really appreciate it if you can tell me what might be the problem. below are my boundary constraints and interaction.
** INTERACTION PROPERTIES** *Surface Interaction, name=_Int-1-Prop1.,*Friction0.,*Surface Behavior, pressure-overclosure=HARD*Surface Interaction, name=indent1.,*Friction0.,*Surface Behavior, pressure-overclosure=HARD*Surface Interaction, name=scratch1.,*Friction, slip tolerance=0.005 0.1,*Surface Behavior, pressure-overclosure=HARD** ** BOUNDARY CONDITIONS** ** Name: but Type: Displacement/Rotation*Boundarybut, 1, 1but, 2, 2but, 3, 3** Name: sym Type: Displacement/Rotation*BoundarySet-7, 1, 1Set-7, 5, 5Set-7, 6, 6** ** INTERACTIONS** ** Interaction: Int-1*Contact Pair, interaction=_Int-1-Prop, small slidingPart-1-1.Surf-1, Part-2-1.Surf-1** ----------------------------------------------------------------** ** STEP: Step-1** *Step, name=Step-1, nlgeom=YES, inc=1000*Static0.0001, 1., 1e-09, 1.** ** BOUNDARY CONDITIONS** ** Name: control refrence point Type: Displacement/Rotation*BoundarySet-4, 1, 1Set-4, 3, 3Set-4, 4, 4Set-4, 5, 5Set-4, 6, 6** ** LOADS** ** Name: Load-1   Type: Concentrated force*CloadSet-4, 2, -100000.** ** ----------------------------------------------------------------
** ** STEP: Step-2** *Step, name=Step-2, nlgeom=YES, inc=1000*Static0.0001, 1., 1e-09, 1.** ** BOUNDARY CONDITIONS** ** Name: control refrence point Type: Displacement/Rotation*BoundarySet-4, 3, 3, -400.** ** INTERACTIONS** ** Interaction: Int-1*Change Friction, interaction=_Int-1-Prop*Friction, slip tolerance=0.005 0.1,** 
** ----------------------------------------------------------------** ** STEP: Step-3** *Step, name=Step-3, nlgeom=YES, inc=1000*Static0.01, 1., 1e-08, 1.** ** BOUNDARY CONDITIONS** ** Name: control refrence point Type: Displacement/Rotation*BoundarySet-4, 2, 2Set-4, 3, 3** ** LOADS** ** Name: Load-1   Type: Concentrated force*CloadSet-4, 2, 0.** ** INTERACTIONS** ** Interaction: Int-1*Change Friction, interaction=_Int-1-Prop*Friction0.,** 
 Regards S.SalariM.Sc Student Life Science Engineering DepartmentUniversity of Tehran, Iran



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