2.5-8 A plastic bar ACB having two different solid circular cross sections is held between rigid supports, as shown in t

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2 5 8 A Plastic Bar Acb Having Two Different Solid Circular Cross Sections Is Held Between Rigid Supports As Shown In T 1 (61.81 KiB) Viewed 25 times

2.5-8 A plastic bar ACB having two different solid circular cross sections is held between rigid supports, as shown in the figure. The diameters in the left-and right-hand parts are 50 mm and 75 mm, respectively. The corresponding lengths are 225 mm and 300 mm. fun A 50 mm C -225 mm- A 50 mm C 225 mm- 175 mm -300 mm- 175 mm -300 mm- (b) Also, the modulus of elasticity E is 6.0 GPa, and the coefficient of thermal expansion a is 100 x 10-6/°C. The bar is subjected to a uniform temperature increase of 30°C. (a) Calculate the following quantities: (1) the com- pressive force N in the bar; (2) the maximum compressive stress o; and (3) the displacement &c of point C. (b) Repeat part (a) if the rigid support at A is replaced by an elastic support having spring constant k = 50 MN/m (see figure part b; assume that only the bar ACB is subject to the temperature increase).