Projects / Mechanical / Project 42

Rotating-Bending Fatigue Testing Machine (S-N Curve)

Approx. component budget: Rs. 14,000 - 18,000

Objective

Find the number of cycles to failure of small steel or aluminium specimens at different stress levels and draw an S-N curve.

What you will build

A motor, a specimen held between bearings, a dead-weight loading arrangement, and a cycle counter with an automatic cut-off at failure.

Results you can expect

• S-N curve of the material
• Endurance limit estimate
• Fracture surface photos
• Effect of surface finish

What you will learn

Fatigue failure, stress amplitude and S-N curves, the most common reason mechanical parts fail in service.

Tools and notes

Lathe to make specimens, cycle counter or Arduino, Excel. Needs a strong guard, a shield around the specimen and an automatic cut-off.

Resume points from this project

• Built and tested Rotating-Bending Fatigue Testing Machine (S-N Curve); objective: find the number of cycles to failure of small steel or aluminium specimens at different stress levels and draw an S-N curve.
• Measured and analysed s-N curve of the material and endurance limit estimate; wrote the report and presented the results in a viva. Add your own numbers: [x].

Replace [x] with your own measured results. Write only what you really did.

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