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 5 of 11.
Syam said:
9 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.
Vaibhav said:
9 years ago
It is not constrained or fixed so no resistance so stress.
Minesh said:
9 years ago
Tensile stress are developed.
RAHUL S said:
9 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.
Chandra prakash said:
9 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.
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.
Chandru said:
9 years ago
Here, the correct answer is no stress.
Chandru said:
9 years ago
The basic definition of stress in a component is, resistance offered by unit resisting area.
So, if no constraints, then there is no resistance, so no stress.
So, if no constraints, then there is no resistance, so no stress.
Arpit said:
9 years ago
If the bar is not fixed, no stress but if it fixed then tensile stress. Data inadequate. !
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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