Mechanical Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 1 (Q.No. 34)
34.
When a bar is cooled to - 5°C, it will develop
Discussion:
106 comments Page 4 of 11.
Surya Shekar said:
1 decade ago
When the bar is cooled, it will contract. This contraction is prevented by the fixed ends which develops tensile stress in the bar. If it is free to contract, then there is no stress developed.
Sujit Mundhe said:
6 years ago
We know that Stress means Internal Stress/Area
If bar at -5' obviously it goes to compression & hence to resist this compression tensile stress is develop in rod to get its actual length.
If bar at -5' obviously it goes to compression & hence to resist this compression tensile stress is develop in rod to get its actual length.
(2)
Rao said:
1 decade ago
Compressive stress is are induced in body of material only, but that is fixed at both ends then, that create tensile stress at ends, if beam is not fixed at ends there no stress developed.
Uzair Ahmad said:
8 years ago
Due to cooling, the metal will shrink. To keep herself in original shape metal will develop internal resistive force opposite to that shrinkage which will result in tensile stress.
Raaja said:
7 years ago
Tensile, when both the ends are fixed in cooling. Compressive, when both the ends are under restriction during heating. If no restrictions there is no stress will develop.
Shrikant said:
7 years ago
No stress will devloped, If the body is free to expand or contract it will do not developed stress.
If the bar is fixed at both ends then it will develop tensile stress.
If the bar is fixed at both ends then it will develop tensile stress.
Akshay Hanmantikar said:
1 decade ago
Whenever a body is heated it expands and when allowed to cool it normally contracts. Its the natural behaviour of material. Hence compressive stress is the right answer.
DSM said:
1 decade ago
When, there is sudden cooling, the inter-molecular forces binding itself very tightly packed, which leads to compression.
Hence the right answer is Compressive stress.
Hence the right answer is Compressive stress.
Ganesh said:
1 decade ago
@Hitesh.
As per your answer if in-case the bar is heated then thermal (compressive) stresses will be developed even without any constraints. Could you please explain?
As per your answer if in-case the bar is heated then thermal (compressive) stresses will be developed even without any constraints. Could you please explain?
Saicharan said:
9 years ago
We can say that when a bar is free to expand no stresses are inducing in it. Then when it is cooled freely why tensile stress is to be considered? Please Suggest me.
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