All members of the aluminum truss have the same cross-sectional area. Member AD and CD are made of steel and member BD is made of aluminum. If the truss is stress-free at 20 °C, determine the stresses in the members at 80 °C. For steel, 11.7 x 10-6/°C and E = 200 GPa and for aluminum, alpha = 23.1 x 10- 6/°C and E = 70 GPa. alpha = %3! B 40° 40° 3 m 3 m

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All members of the aluminum truss have the same cross-sectional area.
Member AD and CD are made of steel and member BD is made of
aluminum. If the truss is stress-free at 20 °C, determine the stresses in
the members at 80 °C. For steel,
11.7 x 10-6/°C and E = 200 GPa and for aluminum, alpha = 23.1 x 10-
6/°C and E = 70 GPa.
alpha =
%3D
40°
40°
3 m
3 m
Transcribed Image Text:All members of the aluminum truss have the same cross-sectional area. Member AD and CD are made of steel and member BD is made of aluminum. If the truss is stress-free at 20 °C, determine the stresses in the members at 80 °C. For steel, 11.7 x 10-6/°C and E = 200 GPa and for aluminum, alpha = 23.1 x 10- 6/°C and E = 70 GPa. alpha = %3D 40° 40° 3 m 3 m
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