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 7 of 11.
Sozharajan said:
9 years ago
Correct answers is no stress, when two bar fixed at both end during heating tensile, during cooling compression will occur.
Chandra prakash said:
8 years ago
When the bar is cooled then it is want to contract but the support tends to tensile load so the stress is induced in the bar is tensile.
RAHUL S said:
8 years ago
As the metal froze to -5 ° It will start to shrink. As it start to shrink the length of the metal start to increase if and only if it is free from external forces (restricted forces). Due to increase in length it is said be acted upon by tensile force.
Minesh said:
8 years ago
Tensile stress are developed.
Vaibhav said:
8 years ago
It is not constrained or fixed so no resistance so stress.
Syam said:
8 years 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. So Whenever a body is heated it expands and when allowed to cool it normally contracts. Its the natural behavior of material so compression stress is the right answer.
Mohd afzal said:
8 years ago
I think if the bar is placed freely then compressive stress will occur, otherwise if the bar is subjected to both end then tensile stress occur.
Teekam said:
8 years ago
We can not say about the stress until we know about the supports provided to the bar. If it is free then there won't be any stress induced.
Vishal said:
8 years ago
If any force applied on a bar then the resisting force developed in the body against the applied force. When the bar is cooled, it will compress. So against compression, the internal force against compression developed. So the force developed is the Tensile force which is trying to resist compression.
So, the tensile stress is the right answer.
So, the tensile stress is the right answer.
Shan said:
8 years ago
The correct answer is compressive stress.
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