A composite bar made up of steel and copper bars of equal lengths are heated through 100°C. The stresses developed shall be
A. Tensile in both the material
B. Tensile in steel and compressive in copper
C. Compressive in steel and tensile in copper
D. Compressive in both the materials
Answer: Option B
Solution(By Examveda Team)
When a composite bar made up of different materials, such as steel and copper, is heated, it experiences thermal expansion. Since steel has a higher coefficient of thermal expansion compared to copper, the following stress distribution occurs:Steel (outer material) expands more and tends to elongate, resulting in tensile stress. Copper (inner material) expands less and tends to contract, resulting in compressive stress.
So, in a composite bar made up of steel and copper bars of equal lengths heated through 100°C, the stresses developed shall be
tensile in steel and compressive in copper. This is represented by Option B. This Question Belongs to Mechanical Engineering >> Strength Of Materials In ME
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Wrong answer
When the composite bar of steel and copper is heated, then the copper member due to its high coefficient of thermal expansion than steel will try to expand more than the steel member but steel due to a lower coefficient of expansion than copper stretched less. Due to this, copper will be in compression while steel will be in tension.
#B is Right ans
I think answer B
I think option "B" is the rigth answer, b'coz the Thermal expansion of copper is morethen that of steel. so, steel is under tensile stress and copper is in copressive.