Week 5 Sphere pressing on a plate

OBJECTIEVE:

• Set up the model for static analysis when sphere pressed over a plate
• We need to see the plastic strain occured in plate

STEPS:

Add materials:-

• Open static structural analysis system, select the material from engineering data
• Engineering data>Engineering data sources>General Non linear materials>Select Structural steel NL
• Add Structural steel and Structural steel NL material for this case

Import the geometry:-

• Import the geometry from saved loacation
• Open the model in space claim to make any edit and to check the model for any abnormality
• Now we have proper model no edit is required
• We will move to Mechanical Workbench for Setting up the model

Mechanical Workbench:-

• Rename the geometry for convinience
• Assign Structural steel for sphere and structural steel NL for plate
• Go to contact and delete default contacts and create manual contact
• Establish the contacts between Sphere and Plate
  

Symmetric region:-

• Define the symmetric region by selcting the faces of plate and sphere with respect to their direction like shown below
• 
  above image is for symmetric region with respect to X-axis
  
  above image shows symmetric region with respect to Z-axis

Mesh:-

• Mesh the model with element size as 0.5mm for refined mesh
• Refine mesh is used for more accurate result
• make sure the number of nodes does not cross academic version
• Meshed model is shown in below image
  

Analysis setting:-

• I have kept the number of step as 5
• Large deflection is ON, Solver type is Direct

Define Load:-

• First define the fixed support for bottom face of plate, inorder not to move
• Then define a Displacement load on top surface of sphere
• As it is mentioned in above question, the total distance travelled by sphere in y direction should be 4mm and retracted it back
  

Output Request:-

• Directional deformation of sphere in y direction
• Equivalent stress for Plate
• Equivalent Strain for Sphere
• Equivalent strain for whole model

RESULTS:

• Directional deformation of sphere in Y direction= -4mm
  
  
  
• Equivalent Stress=3649.1 Mpa
  
  
  
• Equivalent Strain=0.018248 mm/mm
  

CONCLUSION:

• In the above case we can see the directinal deformation in y axis is -4mm, the negative symbols indicates it moved in negative Y direction
• The maximum Stress generated is in Plate
• The maximum strain is also generated in plate
• In this case the Plate is deofrmed and sphere did not because of the material used in plate is non linear