Q.5 A concentric spring for an aircraft engine valve is to exert a maximum force of 5000 N under an axial deflection of 40 mm. Both the springs have same free length, same solid length and are subjected to equal maximum shear stress of 850 MPa. If the spring index for both the springs is 6, Find: 1. The load shared by each spring 2. The main dimensions of both the springs 3. The number of active coils in each spring.
Q.5 A concentric spring for an aircraft engine valve is to exert a maximum force of 5000
N under an axial deflection of 40 mm. Both the springs have same free length, same
solid length and are subjected to equal maximum shear stress of 850 MPa. If the
spring index for both the springs is 6,
Find:
1. The load shared by each spring
2. The main dimensions of both the springs
3. The number of active coils in each spring.
Q.6 A semi-elliptical laminated spring is made of 50 mm wide and 3 mm thick plates.
The length between the supports is 650 mm and the width of the band is 60 mm. The
spring has two full length leaves and five graduated leaves. If the spring carries a
central load of 1600 N,
Find :
1. Maximum stress in full length and graduated leaves for an initial condition of
no stress in the leaves.
2. The maximum stress if the initial stress is provided to cause equal stress when
loaded.
3. The deflection in parts (1) and (2)
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