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Question
If a composite bar of steel and brass is heated, then the brass bar will be under
A.
Tension
B.
Compression
C.
Shear
D.
Shear
Answer ( Option B)

Compression

Solution

General values of 'α': 

Material

Coefficient of thermal expansion

Steel

12 × 10-6/°C

Brass

21 × 10-6/°C

Copper

17 × 10-6/°C

Aluminum

23 × 10-6/°C

Rubber

130 × 10-6/°C to 200 × 10-6 /°C
From the above table, we can say that 
αbrass > αsteel
So, if composite bar is heated then brass will expand more in compare to steel. Hence, as a result brass will come under compression and steel will come under tension.

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