An aluminum rod (E = 70 GPa, α =23.6 x 10-6/°C) and steel link (E = 200 GPa, α = 11.7 x 10-6/°C) have the dimensions shown at a temperature of 20oC. The steel link is heated until the aluminum rod can befitted freely into it. The temperature of the whole assembly is then raised to 150°C. Determine the final stress in the rod and in the link.

In a volume element with dimensions dx, dy, dz the negatíve y-face has a 2 MPa stress in the positivex-direction, a 3 MPa stress in the negative z-direction, and a 4 MPa stress in the negative y-direction. Which of the following describes the stresses per elasticity convention? Oy = 4 MPa Oyr = -2 MPa Oyz = 3 MPa Oy = -4 MPa Oye = 2 MPa Oyz = -3 MPa Oy = 3 MPa Oye = -4 MPa Oyz = 2 MPa =4 MPa Oyr = 2 MPa Oyz = -3 MPa

At room temperature (20°C), a 0.5-mm gap exists between the ends of the rods shown. The temperature eventually reaches a value of 140°C. Determine the normal stress in the aluminum rod. Determine the change in length of the aluminum rod.

7m 4 m 4m 4 m 4m 150 kN 100KN 120KN Determine the normal stress in member BC if the section is circular having an outside diameter of 70mm w/ a thickness of 5mm and indicate if the member is in Compression or Tension.

The temperature of an aluminum bar and a steel bar was raised from 40°C to 160°C. If there was a gap 0.4 mm between the two bars at 40°C as show in figure below, determine the normal stress in the aluminum bar and the change in length of the aluminum bar. 0.5 mm 300 mm 250 mm B Aluminum Stainless steel A = 2000 mm² E = 75 GPa A = 800 mm² E = 190 GPa a = 17.3 x 10-6/°C %3D %3D a = 23 X 10-6/°C