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 6 of 11.
Anup said:
9 years ago
Yes, by compressing the material. The compressive force is induced but tensile stress is developed.
Lamiya naseem said:
9 years ago
The answer is correct. Actually, when the bar is held at -5 degrees. Temp than it's material tends to shrink but the molecule will resist this deformation and hence apply a tensile stress (stress in opposite direction of the shrink).
Praveen maurya said:
9 years ago
Here, stress = alpha*E*deltaT.
Since delta T will be positive, stress is positive, so is a tensile stree will be developed. Hope it helped.
Since delta T will be positive, stress is positive, so is a tensile stree will be developed. Hope it helped.
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.
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