Week 5 Bending of iPhone
OBJECTIVE:
CASE 1:
To perform static structural analysis on iphone bending as it shown in the video.
CASE 2:
Move the bottom fingers from their defined position to the given position X= 22.5mm & Z= 10mm and obtain the results for the simulation. Also define the S-N curve for the Aluminium Alloy material as per values given below and determine the fatigue life results for the same.
GEOMETRY :
The given geometry was imported and edited in spaceclaim.
CASE 1:
CASE 2:
Here pushing fingers position changed ( X= 22.5mm & Z= 10mm).
Fingers stiffness behavior changed to rigid and frame,display,inside body, one pushing finger kept as a flexible.
MATERIALS USED :
CASE 1:
Frame - Alluminium alloy Nl
Display - glass ( This material was obtained by editing the some parameteres in poltethylyne)
Inside body - Polyethylyne
Fingers - polyethylene
CASE 2 :
Frame - Alluminium alloy Nl (In this material, the S-N curve parameters were edited)
Display - glass ( This material was obtained by editing the some parameteres in poltethylyne)
Inside body - Polyethylyne
Fingers - polyethylene
CONTACTS :
Contacts were created and unwanted contacts were deleted.
JOINTS :
Body to ground fixed joints were created for fingers and body to ground translational joins created for pushing fingers.
MESH :
Face sizing with 4 mm element size was generated for push fingers and frame.
Analysis settings :
Fixed support :
To fix the inside body fixed support is created for inside body.
Displacement :
Displacement for frame is created.
Joint Displacement :
Joint displacement was created for pushing fingers and magnitude is taken from tabular data.
Results :
case 1 :
Directional Deformation :
Min : -0.13489 mm
Max : 4.2977 mm
Equivalent sress :
Min : 2.3276 Mpa
Max : 364.58 Mpa
Equivalent strain :
Min : 6.100e-5
Max : 0.00533
Life :
Min : 1e8
Max : 0
Force reaction :
case 2 :
Directional Deformation :
Min : 3.7725 mm
Max : -0.6015 mm
Equivalent sress :
Min : 5.69 Mpa
Max : 335.28 Mpa
Equivalent strain :
Min : 1.43e-5
Max : 0.00539
Life :
Min : 0
Max : 1e8
Force reaction :
Comparing Results :
On comparing the directional deformation of two cases, case 1 has maximum deformation due to the push fingers in the edge of the iphone.
on comparing the Equivalent stress of two cases, there is a slight diference.cas1 has a maximim deformation.
By comparing the Equivalent strain of two cases, case 1 has a high strain, because of push fingers pushing edge of the phone.
By comparing life cycles both cases are same life cycles.