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 9 of 11.
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.
Ashok said:
1 decade ago
Bar means tensile loaded mechanical element if it cools tensile stress are developed(imagine).
Swapna said:
1 decade ago
Stress will not depend on the temperature. So no stress.
Akshay said:
1 decade ago
Stress = internal resistance therefore when the bar is cooled it just shrinks, there is no internal resistance offered by the body until and unless the bar is constrained to shrink by holding it at both ends. Hence answer should be no stress.
Baap said:
1 decade ago
No stress will induce, because no restriction in contracting the bar.
Agoda isaac said:
1 decade ago
A bar is compressive when cooling because when cooling it is contrasting and as we know compression forces are forces that act inwardly in a body while expansion is tensile force because it is elongating the bar that is, the forces acting away from the bar.
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.
Manoj kumar said:
1 decade ago
Compressive stress is the right answer because it is cooling.
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.
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.
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