A spring is a device whose function is to deflect under tensile or compressive load and recover its original shape when unloaded.
Types of Springs:
- Helical Spring
- Spiral Spring
- Leaf Spring
Helical Springs: In this a wire coiled in the form of helix.
- Closed Coil Helical Spring(Tension Spring)
- Open Coiled Helical Spring(Compression Spring)
- Torsional Spring
|Closed Coil Helical Spring||Open Coiled Helical Spring|
|1. Resist tensile forces.||Resist Compressive forces|
|2. Pitch is very small.||Pitch is high|
|3. Each turn lie in same plane at right angles to the axis of helix.||No turn lie in the same plane , hence each turn lie inclined to the axis of helix.|
The maximum shear stress occurs at the innermost fibres of a helical spring under torsion is because of curvature effect.
Where, D= mean diameter of helical coil
d= diameter of spring wire.