Challenge

Week 5 Bending of iPhone

AIM:

PROCEDURE:

Open engineering data add aluminum alloy NL and polythene and create glass material by duplicating polyethylene and rename the material like glass and for aluminum, alloy NL defines S-N curve using below values.

Material properties:

ALUMINUM ALLOY NL:

GLASS:

POLYETHYLENE:

Open ansys mechanical to set up the analysis.
Rename the geometries.
Assign the glass for the screen of the iPhone and the frame assign aluminum alloy NL and for the inner body assign polyethylene.
Change the stiffness behavior of the fingers to rigid except for the pushing finger as shown below.

Now delete the unwanted contacts, Select all the contacts and rename them based on the definition.
Select all the contacts except the contact between the display and the frame and change the contact type to frictionless.

Now select the surfaces of all the fingers one after the other and create a fixed joint from body to ground.

Now go to meshing insert sizing for the frame and bottom surface of the two pushing fingers and give an element size of 4 mm. Change the smoothing to low.

The above image represents mesh metrics which gives details about the element quality and type of elements used for analysis.
Now go to analysis settings change the number of steps to 8 select all the 8 steps and change the solver type to direct and turn large deflection on and change the weak springs to program-controlled.
Change the output controls to yes change the activation of the first substep to yes.
Select stabilization as constant and energy dissipation ratio to 0.1.

Create fixed support for the inner body.
Create displacement support for the frame and make it constant along x and z-directions.
Apply joint loads for the two translational joints loading is given in tabular data as below.

Now input the output results require that are directional deformation along y-direction for frame and equivalent stress and equivalent strain in the frame.
Solve the model for results.

CASE- 2:

For case two Move the bottom fingers from their defined position to the given position X= 22.5mm & Z= 10mm and obtain the results for the simulation.

Repeat the same procedure as case-1 for analysis setup.
Input the fatigue tool under solutions. Select the frame using the body filter and insert the life under the fatigue tool.
Evaluate all the results to find the life of the frame.

Results:

CASE-1:

DIRECTIONAL DEFORMATION ALONG Y-AXIS:

EQUIVALENT STRESS:

MAXIMUM PRINCIPAL ELASTIC STRAIN:

SAFETY FACTOR:

CONTACT PRESSURE:

CASE-2:

DIRECTIONAL DEFORMATION:

EQUIVALENT STRESS:

MAXIMUM PRINCIPAL ELASTIC STRAIN:

SAFETY FACTOR:

FATIGUE LIFE:

CONCLUSIONS:

The iPhone bending simulation is performed successfully and results are obtained.
The bottom fingers from their defined position to the given position X= 22.5mm & Z= 10mm are moved under SpaceClaim and the iPhone bending simulation is performed successfully and the results are obtained.
The shift in the position from the edge to the middle increased the stress generated in the iPhone and the principal strain decreased.

Ship work like this
in your own course.