Mechanical Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 1 (Q.No. 6)
6.
A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce
Discussion:
98 comments Page 10 of 10.
Peter ode eru said:
1 decade ago
Since there is no young modulus in the question, stress cannot be calculated.
Thermal stress = young modulus * stain.
Or
Thermal stress = young modulus*temperature expansion coefficient*temperature difference.
Thermal stress = young modulus * stain.
Or
Thermal stress = young modulus*temperature expansion coefficient*temperature difference.
Anush said:
1 decade ago
Stress is depend upon the area.
Mukh Ram meena said:
1 decade ago
The bar free for expansion, so there no stress.
Vikas said:
1 decade ago
@Krish: Thermal stress is dependent on temp because: stress=E*alpha*diff. in temp. wr alpha is co-efficient of thermal expansion.
Krish said:
1 decade ago
Stress is independent on temp but depends on load and pressure(force also).
Vicky said:
1 decade ago
Body itself tends to restrict the expansion, there must be compressive stress induced.
Vaijinath said:
1 decade ago
Basically stress is internal resistance of a body to applied load unlike pressure (Though both have same unit). Here there is no applied load rather there is no constraint for the bar which means no internal resistance to the deformation therefore the induced (internal force within a body) is zero, correspondingly the stress is zero.
AMAN KUMAR said:
1 decade ago
But the body try to resist the expansion thats why it is also a stress which is known as thermal stress.
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