Mechanical Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 1 (Q.No. 6)
6.
A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce
Discussion:
98 comments Page 8 of 10.
Nisha said:
1 decade ago
Will come into play since expansion is not restricted that's why no stress is occurring.
Ashish said:
1 decade ago
Stress is nothing but the resisting force since due to temperature rise body will expand and if this expansion due to temperature change is restricted then only resisting stress (thermal stress) will come into play since expansion is not restricted that's why no stress is occurring.
Seenuvasan said:
1 decade ago
Stress depends upon load. There is no load so it cannot have any stress.
Kamlesh patil said:
1 decade ago
Thermal stresses tends to increase the length of body due to thermal expansion.
Shubham Gaikwad said:
1 decade ago
Because free expansion of a bar stress will induce in the bar
As =σ = E ε
= E α dt ---- (1).
Where,
σ = Stress due to temperature expansion (N/m2, Pa).
E =Youngs Modulus (N/m2).
ε = Strain.
α = Temperature expansion coefficient (m/m°C).
dt = Temperature differance(°C).
As =σ = E ε
= E α dt ---- (1).
Where,
σ = Stress due to temperature expansion (N/m2, Pa).
E =Youngs Modulus (N/m2).
ε = Strain.
α = Temperature expansion coefficient (m/m°C).
dt = Temperature differance(°C).
DHARMVEER PHATE said:
1 decade ago
Here temperature is changing there so thermal stress is produced there are no stress produced.
Govind said:
1 decade ago
There will be no stress as it is a free expansion.
Suresh said:
1 decade ago
Strain occurs dude to change in length then the product of young's modulus and strain gives the stress developed in the bar. Is it correct?
Gowtham said:
1 decade ago
Stress induced due to temperature is temperature stress.
Harish krishna said:
1 decade ago
No force hence no stress. When temperature has an effect on body thermal stress comes into action.
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