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 7 of 11.
S.VISHAL said:
9 years ago
Stress is the resistance offered by a material to resist the deformation caused by the force acting. Over here since it is cooling, compressive stress will be acting on the body and the body opposes by tensile force hence TENSILE force is induce in the body. Hence the answer is correct.
Abreeque said:
9 years ago
In this question, gives us tensile stress induced. Can anyone explain?
DURGESH KUMAR DUBEY said:
9 years ago
If body fixed at both ends then tensile stress will develop, due to cooling contraction will be developed and compressive stress will occur. But because of a bar fixed at both end their tensile stress will be developed.
See the question is not asking about which stress will apply, it is asking about which will develop.
Thanks
See the question is not asking about which stress will apply, it is asking about which will develop.
Thanks
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.
Arpit said:
9 years ago
If the bar is not fixed, no stress but if it fixed then tensile stress. Data inadequate. !
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.
Chandru said:
9 years ago
Here, the correct answer is no stress.
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:
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.
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.
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