-10 A rigid bar rests on aluminum-alloy and steel uprights, as shown in the figure.( a) Determine the inclination of the horizontal bar after a raise in temperature of 100°C. Assume the coefficients of thermal expansion for aluminum alloy and Steel to be, respectively, 23.2 X 106/°C and 11.7x 10°/°C. To a greatly exaggerated scale, sketch the position of the bar after the raise
3-10 A rigid bar rests on aluminum-alloy and steel uprights, as shown in the figure.( a) Determine the inclination of the horizontal bar after a raise in temperature of 100°C. Assume the coefficients of thermal expansion for aluminum alloy and Steel to be, respectively, 23.2 X 106/°C and 11.7x 10°/°C. To a greatly exaggerated scale, sketch the position of the bar after the raise in temperature. (b) What stresses would develop in the upright members if their tops were prevented from expanding? Let the elastic moduli for aluminum alloy and steel be, respectively, 75 GPA and 200GPa. Compare the obtained stresses with those given in Table 1 of Appendix. (Hint: The tendency for thermal expansion is counteracted by elastic contraction.)
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