Q1) A rod consisting of two cylindrical portions AB and BC is restrained at both ends. Portion AB is made of steel (Es= 200 GPa, αs= 11.7 x 10-6

/°C) and portion BC

of brass (Eb= 105 GPa, αb= 20.9 x 10-6

/°C). Knowing that the rod is initially

unstressed, determine,

a) the reactions at A and B by a temperature rise of 55°C.

b) the normal stresses induced in portions AB and BC by a temperature rise of

55°C.