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 8 of 11.
Hitesh said:
1 decade ago
Stress is the force of resistance per unit area, offered by a body against deformation.
Here the bar is cooled, so it will try to contract. So tensile stress will develop in the bar to resist deformation.
Here the bar is cooled, so it will try to contract. So tensile stress will develop in the bar to resist deformation.
Harish reddy said:
1 decade ago
Compressive stress is the right answer because no specific case is given.
Shubham Patil said:
1 decade ago
The right answer is Compressive Stress, because in question it is not mentioned that it is fixed or not.
Sagar said:
1 decade ago
Due to cooling inter molecules try to shrinking while it makes body to compress but to resist this compressive forces internally tensile forces develops in a body.
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Bharat said:
1 decade ago
This true only when bar is fixed.
Pradeep said:
1 decade ago
Stress is resistance towards deformation. So tensile is correct.
Hemant mishra said:
1 decade ago
Tensile stress is right answer. When bar cooled it molecules shrinks so they will try to expand due to resistance tensile force.
Ravi said:
1 decade ago
Compressive stress is the answer (strain is a reacting force to stress, hence the strain is tensile). As far as option a is considered, stress relieving starts at 450 degrees C. Simply because metals expand on heating and contract on cooling direct effect of which will be considered stress!
Aman said:
1 decade ago
Correct answer is tensile stress b/c bar material resist the force which want to do the shrink the material.
Praveeen V said:
1 decade ago
Compressive stress is induced because when cooling the material will contract, hence there is resistance by the molecules of the material.
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