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:
105 comments Page 2 of 11.
Subbam kumar said:
1 decade ago
Tensile stress will be induced if and only if both the two ends are fixed. If ends are not fixed no stress will be induced. Here nothing is mentioned as such.
Abdusebur said:
1 decade ago
@Mahendra got the point. If the bar fixed at the both end, if it cooled to temperature -5 then it is shrink, when shrink it pushes from the two ends.
Manoj said:
1 decade ago
No shear stress will be developed.
Nikhil said:
1 decade ago
As on applying heat there is no stress will induced likewise on cooling too no stress is developed. Because until we apply any external forces on bar there is no tensile, compressive or shear stresses induced.
Shoeba said:
1 decade ago
Compressive stress is right answer because bar is cooled.
D' nainesh said:
1 decade ago
Tensile stress will develop only if both the ends of a bar is fixed. Otherwise on free contraction and expansion, no stress will develop.
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.
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.
Manoj kumar said:
1 decade ago
Compressive stress is the right answer because it is cooling.
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.
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