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 2 of 10.
BHAVENDRA said:
5 years ago
Stress is defined as internal resistance offer, since bar is allow to expand freely so there won't be any stress but if there is restriction to expansion then there will be thermal stress.
(1)
Maria talib said:
9 years ago
But stress = load/ area.
As a steel bar length increase with temperature and diameter of steel bar reduces and area value is affected which in result change in shear but it is not zero.
As a steel bar length increase with temperature and diameter of steel bar reduces and area value is affected which in result change in shear but it is not zero.
Vaibhav b. said:
9 years ago
Stress is produced only restriction of strain. But there is strain without stress.
Bar expand freely so there is only strain in bar and no restriction of strain. So stress must be zero.
Bar expand freely so there is only strain in bar and no restriction of strain. So stress must be zero.
Rajesh said:
8 years ago
Stress does not produce in the cases where (1) material is free to expand due to temperature (2) water in a free state (3) when the material is on a frictionless surface.
ANUSHA MADASI said:
1 decade ago
Stress appears when there is an resisting force, since there is no resisting object, material or bar is subjected to free expansion. No stress acts on this bar.
Nagul Shareef SHAIK said:
1 decade ago
When a body subjected to temperature change & free to expand then there in no induced stresses. If the bar is restricted, then there is stress development.
Sagar Bankar said:
8 years ago
Stress is generated in the body when we will applying an external force to opposing the body expanding.
But heated body there is no any restriction so stress.
But heated body there is no any restriction so stress.
Ch. Sai Charan said:
4 years ago
If we increase temperature there will be deformation and if we constrain deformation there will be stress.
As here no constraint is available so no stress.
As here no constraint is available so no stress.
(6)
Rupesh baroniya said:
1 decade ago
Length of bar increases when we increase the temperature of it due to temperature stress. So this type of stress is always when we heated a metal bar.
Noorul said:
1 decade ago
If the bar is being pulled by some load even then its free to expand in the direction of load, no stresses should be produced in this case also right?
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