COMPARING THE DIFFERENT INTERFACE CONTACT TYPE 7 TYPE 11

G DRIVE LINK:https://drive.google.com/drive/folders/198kjB6RImn3hSb164YO3ucfBh7fTSoqY

• AIM
  • • COMPARING THE DIFFERENT INTERFACE CONTACT TYPE 7,TYPE 11
    • MESHING THE BUMBER COMPONENT

• MESHING THE BUMBER COMPONENT
  • • OPEN THE FILE IN HYPERMESH
    • GO TO 2D=>AUTOMESH>SET ELEMENT SIZE=6>SELECT ELEMENT TYPE IS QUAD>SELECT THE SURFACE >HIT MESH
    • AFTER COMPLETE THE FULL MESH CHECK THE QUALITY INDEX OF MESHING

• COMPARING THE DIFFERENT INTERFACE CONTACT TYPE 7,TYPE 11
  • • • • • Run the crash tube model as it is.
          • Change the Inacti=6 and run.
          • Create the type 11 contact and run.
          • Remove both notches and remove boundary condition on rigid body node then run.
          • Create a new notch in the middle ,select the whole section and run.
          • Create a new notch with nodes only from opposing 2 faces and run.

• INTRODUCTION OF INTERFACING
  • • • • • Interfaces are defined to model how parts interact when they come into contact with each other

• TYPE OF INTERFACING
  • • • • • Interface Penalty Method
            TYPE7, variable stiffness, node to surface contact
            TYPE11, variable stiffness, edge to edge contact
            TYPE24 , linear stiffness, node to surface, and surface to surface contact

• TYPE 7 NOODE TO SURFACE CONTACT
  • • • • • • Automatic node to surface contact interface using penalty method with variable stiffness
            • A gap is defined around the master segment and the slave nodes
            • The contact gap can be constant or variable
            • Resistive forces are applied to keep slave nodes out of the contact gap
            • Interface time step is computed to insure stability
            • Interface type 7 is a general purpose interface and can simulate all types ofimpact between a set of nodes and a master surface

• Run the crash tube model as it is
  • • • • • • THE ENERGY ERROR IS -3.8 IT ALLOWABLE FOR NEXT SIMULATION
            • MAX CONTACT FORCE=93.848KN
            • ENERGY ERROR=-3.8
            • MASS ERROR =0
            • NO.OF CYCLE=83600
            • IN THIS GRAPHTHE KE AND IE ARE BOTH INVERSELY PROPOSNAL AND THE SUM OF ALL FORCE IS EQUAL TO THE FORCE OF Z DIRECTION

• Change the Inacti=6 and run.
  • • • • • • MAX ENERGY ERROR=-3.8
            • MASS ERROR=0
            • NO.OF CYCLE=83600
            • MAX CONTACT FORCE=93.848KN
            • Inacti Action to take if initial penetrations exist .Recall that for lgap = 1, the Variable Gap = max [Gapmin, (gs+ gm)]
            • where:
              Gapmin = min (tm, lmin/2) or Gapmin = lmin/10 if master segments are all brick
              gm = tm/2, where tm is thickness of master shell – or zero for master brick elements
              gs
              = ts/2, where ts is largest thickness of shell connected to slave node – or zero if slave node not connected to any
              element or only connected to brick or springs
              Best to always specify a small Gapmin

• CASE-3 Create the type 11 contact and run.
  • • • • • • MAX CONTACT FORCE=95.591KN
            • NO.OF.CYCLE=83700
            • ENERGY ERROR=-3.4
            • MASS ERROR=0
            • THE MAX DYNAMIC VALUE IS 21.995 JOULES
            • THE INTERNAL IS INCREASING THE DUE TO APPLIED FORCE THE MAX ENERGY IS 42.45KJ
            • THE MAX RESULTANT FORCE IS 1342 KN

• CASE-4 Remove both notches and remove boundary condition on rigid body node then run.
  • • • • • • MAX ERROR=-3
            • NO.OF CYCLE=77800
            • MAX CONTACT FORCE=59.77KN
            • MASS ERROR=0
            • THE MAX DYNAMIC VALUE IS 13.839KJ
            • THE INTERNAL IS INCREASING THE DUE TO APPLIED FORCE THE MAX ENERGY IS 42.65KJ
            • THE MAX RESULTANT FORCE IS 1196 KN

• CASE-5 Create a new notch in the middle ,select the whole section and run.
  • • • • • • ENERGY ERROR=-3.9
            • MASS ERROR=0
            • NO.OF.CYCLE=96800
            • MAXCONTACT =193.67KN
            • THE MAX DYNAMIC VALUE IS 137.8KJ
            • THE MAX RESULTANT FORCE IS 1338 KN

• CASE-6 Create a new notch with nodes only from opposing 2 faces and run.
  • • • • • • ENERGY ERROR=-4.1
            • MASS ERROR=0
            • NO.OF.CYCLE=80400
            • CONATCT FORCE=72.648KN
            • THE MAX DYNAMIC ENERGY IS 29.308 KJ
            • THE RESULTANT FORCE IS 1381 KN

• RESULT
  • • • • • THE NOTCH ARE RESPONSIBLE FOR THE DYNAMIC VALUE DURING THE SIMULATION,THUS THE BETTER ELEMENT SHOULD BE PREFERED TO GET DESIRED OUTPUT.