Static Structural Analysis of Iphone bending and obtaining the fatigue life of the Phone Using ANSYS Workbench

Objective : To simulate the bending of Iphone and obtaining the fatigue life of the Phone

Case 1

Geometry

The geometry is been import to the design module and the stiffness behavior of the fingers are set to be rigid

Materials

• Aluminum Alloy NL

• Glass

• Polyethylene

• Structural steel

These are four materials that are used in this simulation

Frame - Aluminum Alloy NL

Display- Glass

Inter-Part of the phone - Polyethylene

Fingers- Structural Steel

Connection

Contact Region

• The Frictionless type of contact was applied to the fingers - Phone Frame & Display
• The Bonded Type of contact was applied to the Display and the Frame

Joint

• Body - Ground Fixed Joint was Applied to All the Supporting Finger on the top of the Display

• Body- Ground Translational Joint(along X-axis) was applied to the both pushing Finger which is at bottom

Mesh

Face Sizing

Face sizing is done on the face of the pushing finger and the bottom face of frame

Element Size:3mm

Analysis setting

Boundary Condition

• Fixed support is created at the two end of the phone frame
• Displacement is created at two side face of the phone frame and allows displacement only in y axis

• Joint Load

Displacement is created to two Translation joint along Y axis

Case 2

In Case 2 the position of the two Pushing Finger is changed , they were moved to the centre of frame

from the old position there were moved X=22.5mm Z=10mm

For the Aluminum Alloy NL Material S-N curve is added

Remaining all Pre Processing Setup were same as Case 1

Post Processing for Case 1

• Directional Deformation
• Equivalent Stress
• Stress Tool (Yeild Criterion)
• Factor of Safety For Frame

Solution Output

CASE - 1

Directional Deformation (5.3225mm) along Y-axis

Equivalent Stress(333.7MPa)

• Factor of Safety For Frame (Yeild Criterion)(Min-0.68495)

Post Processing for Case2

• Directional Deformation
• Equivalent Stress
• Factor of Safety For Frame
• Life for Frame

Solution Output

Directional Deformation (4.4269mm) along Y-axis

Equivalent Stress(313.37MPa)

• Factor of Safety For Frame(Min-0.74822)

• Life for Frame In days

1 Day = 1Cycle

Results & Comparison

The Stress Concentration is less in case 2 Compare to Case 1, Because When the load is applied on the centre of the frame the stress are uniformly distributed so that result less stress and lesser deformation compare to case 1

Ansys Workbench File

https://drive.google.com/open?id=1dwYBzxEas2B9NYEqIDLYHtanXuNbRkyX