Bending of iPhone

AIM:

• To perform static structural analysis of iPhone to determine the fatigue life results.

OBJECTIVES OF THE PROJECT:

• To add Aluminium alloy NL, Polyethylene material for the frame and the inner part.
• To insert the contacts for the fingers, frame, inner and glass.
• To fix the inner in X and Z directions.
• To define displacement for the fingers.
• To define fatigue S-N curve for the Aluminium material.
• To mesh the model.
• To define face sizing for the contact faces.
• To evaluate the stress and deformation in the work piece.

PROCEDURE:

• Case 1:
• OPEN WORKBENCH21 > NEW PROJECT > STATIC STRUCTURAL.
• This will start a new static structural project.
• Rename the project as Case 1.
• Go to ENGINEERING DATA > EDIT > GENERAL MATERIALS > POLYETHYLENE > GENERAL MATERIALS NL > ALUMINIUM ALLOY NL > ADD.
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• This will add the material properties.
• Then duplicate the polyethylene properties and edit the values as below.
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• Then double click on Geometry. This will open the Spaceclaim.
• In Space claim check the model for any dents or irregularities.
• The geometry looks good, exit the Spaceclaim.
• Then double click on Model. This will open Mechanical module.
• Now, rename the geometry as per the parts.
• Then assign Aluminium alloy NL to frame, glass material to the display and polyethylene for the inner part.
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• Then go to CONTACTS > CONTACT = BONDED DISPLAY TO FRAME > REST ALL CONTACTS TO BE FRICTIONLESS.
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• This will define the contacts for all the parts.
• Then insert Joints for each fingers.
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• Now, go to MESH > INSERT > SIZING > ELEMENT LENGTH = 4MM > DEFAULT > GENERATE MESH.
• The mesh will be generated on the model.
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• Then go to STATIC STRUCTURAL > ANALYIS SETTINGS > NO OF STEPS = 8 > SOLVER TYPE = DIRECT > LARGE DEFLECTION = ON.
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• Go to STATIC STRUCTURAL > INSERT > FIXED SUPPORT > GEOMETRY = FRAME SIDE FACES.
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• STATIC STRUCTURAL > INSERT > DISPLACEMENT > FREE IN Y COMPONENT.
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• STATIC STRUCTURAL > INSERT > JOINT LOAD > PUSH FINGER 1 > TYPE = DISPLACEMENT > MAGNITUDE = TABULAR DATA.
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• STATIC STRUCTURAL > INSERT > JOINT LOAD > PUSH FINGER 2 > TYPE = DISPLACEMENT > MAGNITUDE = TABULAR DATA.
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• Then, go to SOLUTION > INSERT > STRESS > STRAIN > DIRECTIONAL DEFORMATION > FATIGUE TOOL > LIFE.
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• This will set the output results.
• Then SOLUTION > SOLVE.

• Case 2:
• OPEN WORKBENCH21 > NEW PROJECT > STATIC STRUCTURAL.
• This will start a new static structural project.
• Rename the project as Case 2.
• Go to ENGINEERING DATA > ALUMINIUM ALLOY > ADD > FATIGUE CURVE.
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• Then go to GEOMETRY > OPEN > SPACE CLAIM.
• Translate both the pushing fingers in X by 22.5mm and in Z by 10mm.
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• Then exit the space claim and open Mechanical module.
• Follow all the steps as case 1 for the model setup.
• Then go to SOLUTION > INSERT > FATIGUE TOOL > LIFE.
• Then go to SOLUTION > SOLVE.

RESULTS:

• Case 1:
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• Case 2:
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RESULT TABLE:

	Stress (MPa)	Strain	Deformation (mm)	Life (cycles)
Case 1	364.89	5.5478E-3	4.9208
Case 2	304.88	4.5669E-3	4.6275	1E8

LEARNING OUTCOMES:

• To add Aluminium alloy NL, polyethylene and glass material.
• To assign material from the material library.
• To define contacts for the fingers, display, frame, etc.
• To define fixed support and displacement.
• To deploy mesh on the geometry.
• To define output results.

CONCLUSION:

• By performing this project we conclude that the fatigue life of the iPhone frame is analyzed.

Link for model:

https://drive.google.com/file/d/1QBwNS3f0jl6b2G00e5L9D-xP6mOfABXc/view?usp=sharing