Week 5 Bending of iPhone
OBJECTIVE:-
To simulate the bending of iPhone as per the given cases below
Case 1: Simulate the model as it is given 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.
| Stress, MPa | Number of Cycles, N |
| 225 | 10000 |
| 175 | 100000 |
| 143 | 1000000 |
| 110 | 10000000 |
| 80 | 100000000 |
CASE SETUP AND EXECUTION:-
1. First open the Ansys workbench.
2. Next go to the tool box select analysis systems double click on the static structural pop up on the graphical area as shown below.
3. Next right click on the engineering data click on the edit select the required materials as shown below.
ALUMINUM ALLOY NL
GLASS
POLYETHYLENE
4. Next right click on the geometry select the import geometry to select the geometry.
5. Right-click on the geometry select edit geometry in space claim it opens new tab as shown below.
6. Next right click on the model select edit it opens a new tab as shown below.
GEOMETRY SETUP
I phone
Here assign the materials for display, frame and inside
Display material is glass assign
Frame material is aluminium alloy NL
Inside material is polythene
Pushing fingers
Here one pushing finger is flexible and another one is rigid.
Fixed fingers
Here all fixed fingers are rigid.
CONNECTIONS:-
First, select all connections right click on the selections click on the rename based on the definitions as shown below.
BONDED
FRICTIONLESS
JOINTS
FIXED JOINTS
TRANSLATIONAL JOINT
MESH
Face sizing
STATIC STRUCTURAL
Analysis settings
FIXED SUPPORT
DISPLACEMENT
JOINT
For pushing finger1
For pushing finger 2
7. Next right click on the solution select the solve the analysis is starting.
RESULTS OF CASE 1:-
Directional deformation
Equivalent stress
Equivalent elastic strain
RESULTS OF CASE 2:-
1. First create the S-N curve for the aluminium curve talking the given values as shown below.
| Stress, MPa | Number of Cycles, N |
| 225 | 10000 |
| 175 | 100000 |
| 143 | 1000000 |
| 110 | 10000000 |
| 80 | 100000000 |
2. Update the model and solve the solution.
Directional deformation
Equivalent stress
Equivalent elastic strain
Life
Safety factor
COMPARISON:-
| CASE |
EQUIVALENT STRESS (MPA) |
EQUIVALENT ELASTIC STRAIN (MPA) |
DIRECTIONAL DEFORMATION |
| CASE 1 | 836.69 | 0.23439 | 8 |
| CASE 2 | 919.85 | 0.1074 | 4.4273 |
CONCLUSION:-
By observing the above results case 2 gives the best result in directional deformation and equivalent elastic strain.