Week 5 Bending of iPhone

OBJECTIVE:

• Setting up the model for bending and compare the results with different marterials and different cases

Steps:

Import material:-

• First import the required materials like Aluminium alloy NL, Polyethelene
• Duplicate Polyethelene and rename i as glass, edit the properties like shown below
  
• Duplicate aluminium alloy NL for case 2, with above mentioned SN curve
  

Import Model:-

• Import the model and open in space claim and see for any abnormality in model
• There is no change in the model for case 1
  
• For case 2 move the bottom two fingers x=22.5mm;z=10mm 
  

Assign materials:-

• Firstly rename the parts for our convinience
• Assign Glass material for Display
• Assign Aluminium alloy material for Frame
• Assign Polyethelene material for Inside
• For all the fingers let the stiffness behaviour as Rigid

Create contact:-

• Delete the default contacts between the fingers 
• Rename the contacts based on thier definitions
• Except Display to Frame contact change everything else to Frictionless contact
• Bonded contact between Display-Frame

Create Joints:-

• Create a fixed joint for all the upper fingers
• Create a Translation joint for pushing fingers
• Make sure the reference cordinates are in same direction

Mesh:-

• Face sizing of 4mm for Frame's bottom surface anf pushing fingers
• Keep smoothing quality as LOW

Analysis Settings:-

• Solver type= Direct
  Weak springs=Program Controlled
  Large Deflection=ON
  Stabilization =Constant
  Method= Energy
  Enegergy Disipation ratio=0.1
  Activation for first substep= YES
  Output Controls= Everything as YES

Define Load:-

• Define fixed support for Inside part
• Define displacement for the frame keeping X=Z=Constant; Y=Free
• Define Joint load for each pushing fingers
  Dof=X Displacement
  Type=Displacement
  Magnitude=Tabular data
  

Results and Conclusion:

Case 1:-

• Directional Deformation in y Direction for Frame=5.108 mm
  
• Equivalent Strain=0.16182 mm/mm
  
• Equivalent Stress=829.88 Mpa
  

Case 2:-

• Directional Deformation in y Direction for Frame=4.0932 mm
  
• Equivalent Strain=0.11976 mm/mm
  
• Equivalent Stress=1023.2 Mpa
  
• Safety Factor=15
  
  Safety factor minimum=2.0278E-07
  Design life=1E+09 Cycles

• Case	Eq Stress(Mpa)	Eq Strain(mm/mm)	Deformation(mm)
  1	829.88	0.16182	5.108
  2	1023.2	0.11976	4.0932