Consider a composite bar made of steel and brass, fixed at both ends. If the assembly is heated, which of the following statements is true regarding the thermal stresses?
1
Both materials will develop the same thermal stresses because they are subjected to the same temperature change.
2
There will be no thermal stresses in either material because the bar is free to expand.
3
Brass will develop higher thermal stresses because it has a higher coefficient of thermal expansion than steel.
4
Steel will develop higher thermal stresses because it has a higher coefficient of thermal expansion than Brass