i) Spring testing machine.
ii) A spring
2) To store energy as in clock springs.
3) To apply forces to and to control motions as in brakes and clutches.
4) To measure forces as in spring balances.
5) To change the variations characteristic of a member as in flexible mounting of motors.
Springs may classified as helical springs, leaf springs and flat spring depending upon their shape. To know more about difference between helical spring and leaf spring Click here
Spring can also be classified into close coiled and open coiled springs. To know more about the difference between Close coiled and open coiled spring.Click here
PROCEDURE:
1) Measure the diameter of the wire of the spring by using the micrometer.
2) Measure the diameter of spring coils by using the vernier caliper
3) Count the number of turns.
4) Insert the spring in the spring testing machine and load the spring by a suitable weight and note the corresponding axial deflection in tension or compression.
5) Increase the load and take the corresponding axial deflection readings.
6) Plot a curve between load and deflection. The shape of the curve gives the stiffness of the spring.
OBESERVATION
Least count of micrometer = ……mm
Diameter of the spring wire, d =………mm
(Mean of three readings)
Least count of vernier caliper = ……mm
Diameter of the spring coil, D = ……mm
Mean coil diameter Dm = D - d……mm
Number of turns n =
OBESERVATION
|
SL.NO |
Load,W |
Deflection,(δ) |
Stiffness K = W / δ |
|
1 |
|||
|
2 |
|||
|
3 |
|||
|
4 |
|||
|
5 |
Modulus of rigidity
Spring Index = Dm
RESULT
No comments:
Post a Comment