# Mechanical Engineering - Strength of Materials - Discussion

Discussion Forum : Strength of Materials - Section 1 (Q.No. 10)

10.

The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.

Discussion:

25 comments Page 3 of 3.
K.p said:
1 decade ago

It is experimentally proved that the stress developed by impact load is twice than developed by gradually applied load.

Siva bala said:
1 decade ago

In case of impact loading the dynamic force experienced by the body is given by P(dyn.) = W*[1+sqrt(1+2h/D)].

Here P = dynamic load experienced by the body.

W = static load which is impacting.

D = stact deflection due to above load.

h = height from which load is acting.

In this case h=0, So dynamic load experienced by the body is twice the load applied. As load to area is stress so stresses induced will be twice.

Here P = dynamic load experienced by the body.

W = static load which is impacting.

D = stact deflection due to above load.

h = height from which load is acting.

In this case h=0, So dynamic load experienced by the body is twice the load applied. As load to area is stress so stresses induced will be twice.

Abinash said:
1 decade ago

When the load is applied slowly due to viscous dissipation by the atmosphere only half of the energy is stored as compared to the case when the load is applied suddenly.

Dara Singh said:
1 decade ago

Twice stress why & which formula used this it may be more than twice or little less than twice.

Akshay patil said:
1 decade ago

Suddenly applied load, having higher velocity compared to gradually applied load.

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