Civil Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 3 (Q.No. 17)
17.
A composite member shown in below figure was formed at 25°C and was made of two materials a and b. If the coefficient of thermal expansion of a is more than that of b and the composite member is heated upto 45°C, then
Discussion:
13 comments Page 2 of 2.
Muhammad usman said:
6 years ago
If we see the figure bar a will elongate more is compare to b so a rigid bar c try to push the bar a inward and bar b outward to keep in equilibrium so the comparison is developed in a and tension in b.
Shah Sawar said:
4 years ago
The given answer is correct.
In composite members, both bars have to produce the same strain.
Now "a" bar due to its high coefficient of thermal expansion will tend to produce a higher strain than "b" bar and to fulfil the requirement of the same strain, tension is produced in "b" bar and compressive stresses in "a" bar.
In composite members, both bars have to produce the same strain.
Now "a" bar due to its high coefficient of thermal expansion will tend to produce a higher strain than "b" bar and to fulfil the requirement of the same strain, tension is produced in "b" bar and compressive stresses in "a" bar.
(1)
Gokul said:
3 years ago
Steel is coefficient of thermal expansion 12x10^ -6c .
Taken brass coefficient of thermal expansion is 16x10^-6c.
In composite beam, the steel is tensile in nature if the coefficient of thermal expansion is less and brass is compressive if the coefficient of thermal expansion is more.
Taken brass coefficient of thermal expansion is 16x10^-6c.
In composite beam, the steel is tensile in nature if the coefficient of thermal expansion is less and brass is compressive if the coefficient of thermal expansion is more.
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