MACHINE DESIGN: PAST BOARD EXAM PROBLEMS CHAPTER 8 - SPRINGS PART 1

MACHINE DESIGN

PAST BOARD EXAM PROBLEMS

CHAPTER 8: SPRINGS PART 1

1. The spring index of a spring set – up is is 4.5. Determine the stress concentration factor due to coil curvature.
2. Determine the wire diameter given a mean diameter of 20 mm when the Bergstrasser Factor of a spring set – up is 1.172.
3. A spring has load of 50 lbs with a spring index of 8. If the induced stress is 90 ksi, determine the wire diameter.
4. A spring has a wire diameter of 25 mm with 12 active coils. If a load of 10 kN is applied, it deflects by 75 mm. Determine the mean diameter of the spring. Take G = 80 GPa.
5. A spring has a rate of 30 kN/m. If the wire diameter is 10 mm and the spring index is 7, determine the number of active coils. Use G = 80 GPa.
6. A helical steel spring having 20 active turns of 20 mm wire diameter supports a load of 2.5 kN. Determine the maximum shearing stress if the mean diameter of the coils is 180 mm. Use G = 83 GPa.

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