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 3 of 11.
Deepak said:
8 years ago
No, stress is formed within the bar when cooled unless the bar is fixed.
PRUDHVI11 said:
8 years ago
In thermal analasys of stress if there is no restriction of strain no stresses are produced, in the given question they said that bar is cooled the bar is not in equbrlium then stress produced is zero.
Uzair Ahmad said:
8 years ago
Due to cooling, the metal will shrink. To keep herself in original shape metal will develop internal resistive force opposite to that shrinkage which will result in tensile stress.
Chirag said:
8 years ago
Stress=load/area and is independent of temperature so no stress will develop.
Navaj M said:
8 years ago
Actually, first clear that, stress means an internal pressure which resists the external deformation.
After that whenever anybody is cooled it undergoes shrinkage that means externally compressive force is subjected therefore to resist them internally pressure developed is nothing but tensile stress.
After that whenever anybody is cooled it undergoes shrinkage that means externally compressive force is subjected therefore to resist them internally pressure developed is nothing but tensile stress.
Manish said:
8 years ago
@Aditi, I do agree with your explanation.
Learn said:
8 years ago
If we assume the body is fixed due to cooling body try to contrast which leads to the development of tensile stress to overcome that induced compressive stress.
Aditi said:
8 years ago
I think the answer should be no stresses, as the bar is contracting freely.
Suppose the bar is fixed at both the ends and it is being cooled, then in order to maintain it's true state tensile stresses will be induced in bar.
In similar manner if a fixed bar is being heated it won't expand and compressive stresses will be induced in bar.
Suppose the bar is fixed at both the ends and it is being cooled, then in order to maintain it's true state tensile stresses will be induced in bar.
In similar manner if a fixed bar is being heated it won't expand and compressive stresses will be induced in bar.
Ramu said:
8 years ago
When cooling contraction takes place, but the bar develops Tensile stress, it will try to oppose the contraction.
RAJEEV said:
8 years ago
It depends on the configuration of a bar. If the bar is free at both ends and no restriction whatsoever, then no stresses will be developed.
If it is constrained, when we cool the bar it tends to shrink which develops tensile stress inside the bar.
Similarly, when we heat the bar it tends to expand and due to constraint compressive stresses are developed.
If it is constrained, when we cool the bar it tends to shrink which develops tensile stress inside the bar.
Similarly, when we heat the bar it tends to expand and due to constraint compressive stresses are developed.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers